quantum-espresso/flib/blas.f

3830 lines
111 KiB
Fortran

SUBROUTINE DAXPY(N,DA,DX,INCX,DY,INCY)
C
C CONSTANT TIMES A VECTOR PLUS A VECTOR.
C USES UNROLLED LOOPS FOR INCREMENTS EQUAL TO ONE.
C JACK DONGARRA, LINPACK, 3/11/78.
C
DOUBLE PRECISION DX(1),DY(1),DA
INTEGER I,INCX,INCY,IX,IY,M,MP1,N
C
IF(N.LE.0)RETURN
IF (DA .EQ. 0.0D0) RETURN
IF(INCX.EQ.1.AND.INCY.EQ.1)GO TO 20
C
C CODE FOR UNEQUAL INCREMENTS OR EQUAL INCREMENTS
C NOT EQUAL TO 1
C
IX = 1
IY = 1
IF(INCX.LT.0)IX = (-N+1)*INCX + 1
IF(INCY.LT.0)IY = (-N+1)*INCY + 1
DO 10 I = 1,N
DY(IY) = DY(IY) + DA*DX(IX)
IX = IX + INCX
IY = IY + INCY
10 CONTINUE
RETURN
C
C CODE FOR BOTH INCREMENTS EQUAL TO 1
C
C
C CLEAN-UP LOOP
C
20 M = MOD(N,4)
IF( M .EQ. 0 ) GO TO 40
DO 30 I = 1,M
DY(I) = DY(I) + DA*DX(I)
30 CONTINUE
IF( N .LT. 4 ) RETURN
40 MP1 = M + 1
DO 50 I = MP1,N,4
DY(I) = DY(I) + DA*DX(I)
DY(I + 1) = DY(I + 1) + DA*DX(I + 1)
DY(I + 2) = DY(I + 2) + DA*DX(I + 2)
DY(I + 3) = DY(I + 3) + DA*DX(I + 3)
50 CONTINUE
RETURN
END
DOUBLE PRECISION FUNCTION DDOT(N,DX,INCX,DY,INCY)
C
C FORMS THE DOT PRODUCT OF TWO VECTORS.
C USES UNROLLED LOOPS FOR INCREMENTS EQUAL TO ONE.
C JACK DONGARRA, LINPACK, 3/11/78.
C
DOUBLE PRECISION DX(1),DY(1),DTEMP
INTEGER I,INCX,INCY,IX,IY,M,MP1,N
C
DDOT = 0.0D0
DTEMP = 0.0D0
IF(N.LE.0)RETURN
IF(INCX.EQ.1.AND.INCY.EQ.1)GO TO 20
C
C CODE FOR UNEQUAL INCREMENTS OR EQUAL INCREMENTS
C NOT EQUAL TO 1
C
IX = 1
IY = 1
IF(INCX.LT.0)IX = (-N+1)*INCX + 1
IF(INCY.LT.0)IY = (-N+1)*INCY + 1
DO 10 I = 1,N
DTEMP = DTEMP + DX(IX)*DY(IY)
IX = IX + INCX
IY = IY + INCY
10 CONTINUE
DDOT = DTEMP
RETURN
C
C CODE FOR BOTH INCREMENTS EQUAL TO 1
C
C
C CLEAN-UP LOOP
C
20 M = MOD(N,5)
IF( M .EQ. 0 ) GO TO 40
DO 30 I = 1,M
DTEMP = DTEMP + DX(I)*DY(I)
30 CONTINUE
IF( N .LT. 5 ) GO TO 60
40 MP1 = M + 1
DO 50 I = MP1,N,5
DTEMP = DTEMP + DX(I)*DY(I) + DX(I + 1)*DY(I + 1) +
* DX(I + 2)*DY(I + 2) + DX(I + 3)*DY(I + 3) + DX(I + 4)*DY(I + 4)
50 CONTINUE
60 DDOT = DTEMP
RETURN
END
SUBROUTINE DGEMM ( TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB,
$ BETA, C, LDC )
* .. SCALAR ARGUMENTS ..
CHARACTER*1 TRANSA, TRANSB
INTEGER M, N, K, LDA, LDB, LDC
DOUBLE PRECISION ALPHA, BETA
* .. ARRAY ARGUMENTS ..
DOUBLE PRECISION A( LDA, * ), B( LDB, * ), C( LDC, * )
* ..
*
* PURPOSE
* =======
*
* DGEMM PERFORMS ONE OF THE MATRIX-MATRIX OPERATIONS
*
* C := ALPHA*OP( A )*OP( B ) + BETA*C,
*
* WHERE OP( X ) IS ONE OF
*
* OP( X ) = X OR OP( X ) = X',
*
* ALPHA AND BETA ARE SCALARS, AND A, B AND C ARE MATRICES, WITH OP( A )
* AN M BY K MATRIX, OP( B ) A K BY N MATRIX AND C AN M BY N MATRIX.
*
* PARAMETERS
* ==========
*
* TRANSA - CHARACTER*1.
* ON ENTRY, TRANSA SPECIFIES THE FORM OF OP( A ) TO BE USED IN
* THE MATRIX MULTIPLICATION AS FOLLOWS:
*
* TRANSA = 'N' OR 'N', OP( A ) = A.
*
* TRANSA = 'T' OR 'T', OP( A ) = A'.
*
* TRANSA = 'C' OR 'C', OP( A ) = A'.
*
* UNCHANGED ON EXIT.
*
* TRANSB - CHARACTER*1.
* ON ENTRY, TRANSB SPECIFIES THE FORM OF OP( B ) TO BE USED IN
* THE MATRIX MULTIPLICATION AS FOLLOWS:
*
* TRANSB = 'N' OR 'N', OP( B ) = B.
*
* TRANSB = 'T' OR 'T', OP( B ) = B'.
*
* TRANSB = 'C' OR 'C', OP( B ) = B'.
*
* UNCHANGED ON EXIT.
*
* M - INTEGER.
* ON ENTRY, M SPECIFIES THE NUMBER OF ROWS OF THE MATRIX
* OP( A ) AND OF THE MATRIX C. M MUST BE AT LEAST ZERO.
* UNCHANGED ON EXIT.
*
* N - INTEGER.
* ON ENTRY, N SPECIFIES THE NUMBER OF COLUMNS OF THE MATRIX
* OP( B ) AND THE NUMBER OF COLUMNS OF THE MATRIX C. N MUST BE
* AT LEAST ZERO.
* UNCHANGED ON EXIT.
*
* K - INTEGER.
* ON ENTRY, K SPECIFIES THE NUMBER OF COLUMNS OF THE MATRIX
* OP( A ) AND THE NUMBER OF ROWS OF THE MATRIX OP( B ). K MUST
* BE AT LEAST ZERO.
* UNCHANGED ON EXIT.
*
* ALPHA - DOUBLE PRECISION.
* ON ENTRY, ALPHA SPECIFIES THE SCALAR ALPHA.
* UNCHANGED ON EXIT.
*
* A - DOUBLE PRECISION ARRAY OF DIMENSION ( LDA, KA ), WHERE KA IS
* K WHEN TRANSA = 'N' OR 'N', AND IS M OTHERWISE.
* BEFORE ENTRY WITH TRANSA = 'N' OR 'N', THE LEADING M BY K
* PART OF THE ARRAY A MUST CONTAIN THE MATRIX A, OTHERWISE
* THE LEADING K BY M PART OF THE ARRAY A MUST CONTAIN THE
* MATRIX A.
* UNCHANGED ON EXIT.
*
* LDA - INTEGER.
* ON ENTRY, LDA SPECIFIES THE FIRST DIMENSION OF A AS DECLARED
* IN THE CALLING (SUB) PROGRAM. WHEN TRANSA = 'N' OR 'N' THEN
* LDA MUST BE AT LEAST MAX( 1, M ), OTHERWISE LDA MUST BE AT
* LEAST MAX( 1, K ).
* UNCHANGED ON EXIT.
*
* B - DOUBLE PRECISION ARRAY OF DIMENSION ( LDB, KB ), WHERE KB IS
* N WHEN TRANSB = 'N' OR 'N', AND IS K OTHERWISE.
* BEFORE ENTRY WITH TRANSB = 'N' OR 'N', THE LEADING K BY N
* PART OF THE ARRAY B MUST CONTAIN THE MATRIX B, OTHERWISE
* THE LEADING N BY K PART OF THE ARRAY B MUST CONTAIN THE
* MATRIX B.
* UNCHANGED ON EXIT.
*
* LDB - INTEGER.
* ON ENTRY, LDB SPECIFIES THE FIRST DIMENSION OF B AS DECLARED
* IN THE CALLING (SUB) PROGRAM. WHEN TRANSB = 'N' OR 'N' THEN
* LDB MUST BE AT LEAST MAX( 1, K ), OTHERWISE LDB MUST BE AT
* LEAST MAX( 1, N ).
* UNCHANGED ON EXIT.
*
* BETA - DOUBLE PRECISION.
* ON ENTRY, BETA SPECIFIES THE SCALAR BETA. WHEN BETA IS
* SUPPLIED AS ZERO THEN C NEED NOT BE SET ON INPUT.
* UNCHANGED ON EXIT.
*
* C - DOUBLE PRECISION ARRAY OF DIMENSION ( LDC, N ).
* BEFORE ENTRY, THE LEADING M BY N PART OF THE ARRAY C MUST
* CONTAIN THE MATRIX C, EXCEPT WHEN BETA IS ZERO, IN WHICH
* CASE C NEED NOT BE SET ON ENTRY.
* ON EXIT, THE ARRAY C IS OVERWRITTEN BY THE M BY N MATRIX
* ( ALPHA*OP( A )*OP( B ) + BETA*C ).
*
* LDC - INTEGER.
* ON ENTRY, LDC SPECIFIES THE FIRST DIMENSION OF C AS DECLARED
* IN THE CALLING (SUB) PROGRAM. LDC MUST BE AT LEAST
* MAX( 1, M ).
* UNCHANGED ON EXIT.
*
*
* LEVEL 3 BLAS ROUTINE.
*
* -- WRITTEN ON 8-FEBRUARY-1989.
* JACK DONGARRA, ARGONNE NATIONAL LABORATORY.
* IAIN DUFF, AERE HARWELL.
* JEREMY DU CROZ, NUMERICAL ALGORITHMS GROUP LTD.
* SVEN HAMMARLING, NUMERICAL ALGORITHMS GROUP LTD.
*
*
* .. EXTERNAL FUNCTIONS ..
LOGICAL LSAME
EXTERNAL LSAME
* .. EXTERNAL SUBROUTINES ..
EXTERNAL XERBLA
* .. INTRINSIC FUNCTIONS ..
INTRINSIC MAX
* .. LOCAL SCALARS ..
LOGICAL NOTA, NOTB
INTEGER I, INFO, J, L, NCOLA, NROWA, NROWB
DOUBLE PRECISION TEMP
* .. PARAMETERS ..
DOUBLE PRECISION ONE , ZERO
PARAMETER ( ONE = 1.0D+0, ZERO = 0.0D+0 )
* ..
* .. EXECUTABLE STATEMENTS ..
*
* SET NOTA AND NOTB AS TRUE IF A AND B RESPECTIVELY ARE NOT
* TRANSPOSED AND SET NROWA, NCOLA AND NROWB AS THE NUMBER OF ROWS
* AND COLUMNS OF A AND THE NUMBER OF ROWS OF B RESPECTIVELY.
*
NOTA = LSAME( TRANSA, 'N' )
NOTB = LSAME( TRANSB, 'N' )
IF( NOTA )THEN
NROWA = M
NCOLA = K
ELSE
NROWA = K
NCOLA = M
END IF
IF( NOTB )THEN
NROWB = K
ELSE
NROWB = N
END IF
*
* TEST THE INPUT PARAMETERS.
*
INFO = 0
IF( ( .NOT.NOTA ).AND.
$ ( .NOT.LSAME( TRANSA, 'C' ) ).AND.
$ ( .NOT.LSAME( TRANSA, 'T' ) ) )THEN
INFO = 1
ELSE IF( ( .NOT.NOTB ).AND.
$ ( .NOT.LSAME( TRANSB, 'C' ) ).AND.
$ ( .NOT.LSAME( TRANSB, 'T' ) ) )THEN
INFO = 2
ELSE IF( M .LT.0 )THEN
INFO = 3
ELSE IF( N .LT.0 )THEN
INFO = 4
ELSE IF( K .LT.0 )THEN
INFO = 5
ELSE IF( LDA.LT.MAX( 1, NROWA ) )THEN
INFO = 8
ELSE IF( LDB.LT.MAX( 1, NROWB ) )THEN
INFO = 10
ELSE IF( LDC.LT.MAX( 1, M ) )THEN
INFO = 13
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'DGEMM ', INFO )
RETURN
END IF
*
* QUICK RETURN IF POSSIBLE.
*
IF( ( M.EQ.0 ).OR.( N.EQ.0 ).OR.
$ ( ( ( ALPHA.EQ.ZERO ).OR.( K.EQ.0 ) ).AND.( BETA.EQ.ONE ) ) )
$ RETURN
*
* AND IF ALPHA.EQ.ZERO.
*
IF( ALPHA.EQ.ZERO )THEN
IF( BETA.EQ.ZERO )THEN
DO 20, J = 1, N
DO 10, I = 1, M
C( I, J ) = ZERO
10 CONTINUE
20 CONTINUE
ELSE
DO 40, J = 1, N
DO 30, I = 1, M
C( I, J ) = BETA*C( I, J )
30 CONTINUE
40 CONTINUE
END IF
RETURN
END IF
*
* START THE OPERATIONS.
*
IF( NOTB )THEN
IF( NOTA )THEN
*
* FORM C := ALPHA*A*B + BETA*C.
*
DO 90, J = 1, N
IF( BETA.EQ.ZERO )THEN
DO 50, I = 1, M
C( I, J ) = ZERO
50 CONTINUE
ELSE IF( BETA.NE.ONE )THEN
DO 60, I = 1, M
C( I, J ) = BETA*C( I, J )
60 CONTINUE
END IF
DO 80, L = 1, K
IF( B( L, J ).NE.ZERO )THEN
TEMP = ALPHA*B( L, J )
DO 70, I = 1, M
C( I, J ) = C( I, J ) + TEMP*A( I, L )
70 CONTINUE
END IF
80 CONTINUE
90 CONTINUE
ELSE
*
* FORM C := ALPHA*A'*B + BETA*C
*
DO 120, J = 1, N
DO 110, I = 1, M
TEMP = ZERO
DO 100, L = 1, K
TEMP = TEMP + A( L, I )*B( L, J )
100 CONTINUE
IF( BETA.EQ.ZERO )THEN
C( I, J ) = ALPHA*TEMP
ELSE
C( I, J ) = ALPHA*TEMP + BETA*C( I, J )
END IF
110 CONTINUE
120 CONTINUE
END IF
ELSE
IF( NOTA )THEN
*
* FORM C := ALPHA*A*B' + BETA*C
*
DO 170, J = 1, N
IF( BETA.EQ.ZERO )THEN
DO 130, I = 1, M
C( I, J ) = ZERO
130 CONTINUE
ELSE IF( BETA.NE.ONE )THEN
DO 140, I = 1, M
C( I, J ) = BETA*C( I, J )
140 CONTINUE
END IF
DO 160, L = 1, K
IF( B( J, L ).NE.ZERO )THEN
TEMP = ALPHA*B( J, L )
DO 150, I = 1, M
C( I, J ) = C( I, J ) + TEMP*A( I, L )
150 CONTINUE
END IF
160 CONTINUE
170 CONTINUE
ELSE
*
* FORM C := ALPHA*A'*B' + BETA*C
*
DO 200, J = 1, N
DO 190, I = 1, M
TEMP = ZERO
DO 180, L = 1, K
TEMP = TEMP + A( L, I )*B( J, L )
180 CONTINUE
IF( BETA.EQ.ZERO )THEN
C( I, J ) = ALPHA*TEMP
ELSE
C( I, J ) = ALPHA*TEMP + BETA*C( I, J )
END IF
190 CONTINUE
200 CONTINUE
END IF
END IF
*
RETURN
*
* END OF DGEMM .
*
END
SUBROUTINE DGEMV ( TRANS, M, N, ALPHA, A, LDA, X, INCX,
$ BETA, Y, INCY )
* .. SCALAR ARGUMENTS ..
DOUBLE PRECISION ALPHA, BETA
INTEGER INCX, INCY, LDA, M, N
CHARACTER*1 TRANS
* .. ARRAY ARGUMENTS ..
DOUBLE PRECISION A( LDA, * ), X( * ), Y( * )
* ..
*
* PURPOSE
* =======
*
* DGEMV PERFORMS ONE OF THE MATRIX-VECTOR OPERATIONS
*
* Y := ALPHA*A*X + BETA*Y, OR Y := ALPHA*A'*X + BETA*Y,
*
* WHERE ALPHA AND BETA ARE SCALARS, X AND Y ARE VECTORS AND A IS AN
* M BY N MATRIX.
*
* PARAMETERS
* ==========
*
* TRANS - CHARACTER*1.
* ON ENTRY, TRANS SPECIFIES THE OPERATION TO BE PERFORMED AS
* FOLLOWS:
*
* TRANS = 'N' OR 'N' Y := ALPHA*A*X + BETA*Y.
*
* TRANS = 'T' OR 'T' Y := ALPHA*A'*X + BETA*Y.
*
* TRANS = 'C' OR 'C' Y := ALPHA*A'*X + BETA*Y.
*
* UNCHANGED ON EXIT.
*
* M - INTEGER.
* ON ENTRY, M SPECIFIES THE NUMBER OF ROWS OF THE MATRIX A.
* M MUST BE AT LEAST ZERO.
* UNCHANGED ON EXIT.
*
* N - INTEGER.
* ON ENTRY, N SPECIFIES THE NUMBER OF COLUMNS OF THE MATRIX A.
* N MUST BE AT LEAST ZERO.
* UNCHANGED ON EXIT.
*
* ALPHA - DOUBLE PRECISION.
* ON ENTRY, ALPHA SPECIFIES THE SCALAR ALPHA.
* UNCHANGED ON EXIT.
*
* A - DOUBLE PRECISION ARRAY OF DIMENSION ( LDA, N ).
* BEFORE ENTRY, THE LEADING M BY N PART OF THE ARRAY A MUST
* CONTAIN THE MATRIX OF COEFFICIENTS.
* UNCHANGED ON EXIT.
*
* LDA - INTEGER.
* ON ENTRY, LDA SPECIFIES THE FIRST DIMENSION OF A AS DECLARED
* IN THE CALLING (SUB) PROGRAM. LDA MUST BE AT LEAST
* MAX( 1, M ).
* UNCHANGED ON EXIT.
*
* X - DOUBLE PRECISION ARRAY OF DIMENSION AT LEAST
* ( 1 + ( N - 1 )*ABS( INCX ) ) WHEN TRANS = 'N' OR 'N'
* AND AT LEAST
* ( 1 + ( M - 1 )*ABS( INCX ) ) OTHERWISE.
* BEFORE ENTRY, THE INCREMENTED ARRAY X MUST CONTAIN THE
* VECTOR X.
* UNCHANGED ON EXIT.
*
* INCX - INTEGER.
* ON ENTRY, INCX SPECIFIES THE INCREMENT FOR THE ELEMENTS OF
* X. INCX MUST NOT BE ZERO.
* UNCHANGED ON EXIT.
*
* BETA - DOUBLE PRECISION.
* ON ENTRY, BETA SPECIFIES THE SCALAR BETA. WHEN BETA IS
* SUPPLIED AS ZERO THEN Y NEED NOT BE SET ON INPUT.
* UNCHANGED ON EXIT.
*
* Y - DOUBLE PRECISION ARRAY OF DIMENSION AT LEAST
* ( 1 + ( M - 1 )*ABS( INCY ) ) WHEN TRANS = 'N' OR 'N'
* AND AT LEAST
* ( 1 + ( N - 1 )*ABS( INCY ) ) OTHERWISE.
* BEFORE ENTRY WITH BETA NON-ZERO, THE INCREMENTED ARRAY Y
* MUST CONTAIN THE VECTOR Y. ON EXIT, Y IS OVERWRITTEN BY THE
* UPDATED VECTOR Y.
*
* INCY - INTEGER.
* ON ENTRY, INCY SPECIFIES THE INCREMENT FOR THE ELEMENTS OF
* Y. INCY MUST NOT BE ZERO.
* UNCHANGED ON EXIT.
*
*
* LEVEL 2 BLAS ROUTINE.
*
* -- WRITTEN ON 22-OCTOBER-1986.
* JACK DONGARRA, ARGONNE NATIONAL LAB.
* JEREMY DU CROZ, NAG CENTRAL OFFICE.
* SVEN HAMMARLING, NAG CENTRAL OFFICE.
* RICHARD HANSON, SANDIA NATIONAL LABS.
*
*
* .. PARAMETERS ..
DOUBLE PRECISION ONE , ZERO
PARAMETER ( ONE = 1.0D+0, ZERO = 0.0D+0 )
* .. LOCAL SCALARS ..
DOUBLE PRECISION TEMP
INTEGER I, INFO, IX, IY, J, JX, JY, KX, KY, LENX, LENY
* .. EXTERNAL FUNCTIONS ..
LOGICAL LSAME
EXTERNAL LSAME
* .. EXTERNAL SUBROUTINES ..
EXTERNAL XERBLA
* .. INTRINSIC FUNCTIONS ..
INTRINSIC MAX
* ..
* .. EXECUTABLE STATEMENTS ..
*
* TEST THE INPUT PARAMETERS.
*
INFO = 0
IF ( .NOT.LSAME( TRANS, 'N' ).AND.
$ .NOT.LSAME( TRANS, 'T' ).AND.
$ .NOT.LSAME( TRANS, 'C' ) )THEN
INFO = 1
ELSE IF( M.LT.0 )THEN
INFO = 2
ELSE IF( N.LT.0 )THEN
INFO = 3
ELSE IF( LDA.LT.MAX( 1, M ) )THEN
INFO = 6
ELSE IF( INCX.EQ.0 )THEN
INFO = 8
ELSE IF( INCY.EQ.0 )THEN
INFO = 11
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'DGEMV ', INFO )
RETURN
END IF
*
* QUICK RETURN IF POSSIBLE.
*
IF( ( M.EQ.0 ).OR.( N.EQ.0 ).OR.
$ ( ( ALPHA.EQ.ZERO ).AND.( BETA.EQ.ONE ) ) )
$ RETURN
*
* SET LENX AND LENY, THE LENGTHS OF THE VECTORS X AND Y, AND SET
* UP THE START POINTS IN X AND Y.
*
IF( LSAME( TRANS, 'N' ) )THEN
LENX = N
LENY = M
ELSE
LENX = M
LENY = N
END IF
IF( INCX.GT.0 )THEN
KX = 1
ELSE
KX = 1 - ( LENX - 1 )*INCX
END IF
IF( INCY.GT.0 )THEN
KY = 1
ELSE
KY = 1 - ( LENY - 1 )*INCY
END IF
*
* START THE OPERATIONS. IN THIS VERSION THE ELEMENTS OF A ARE
* ACCESSED SEQUENTIALLY WITH ONE PASS THROUGH A.
*
* FIRST FORM Y := BETA*Y.
*
IF( BETA.NE.ONE )THEN
IF( INCY.EQ.1 )THEN
IF( BETA.EQ.ZERO )THEN
DO 10, I = 1, LENY
Y( I ) = ZERO
10 CONTINUE
ELSE
DO 20, I = 1, LENY
Y( I ) = BETA*Y( I )
20 CONTINUE
END IF
ELSE
IY = KY
IF( BETA.EQ.ZERO )THEN
DO 30, I = 1, LENY
Y( IY ) = ZERO
IY = IY + INCY
30 CONTINUE
ELSE
DO 40, I = 1, LENY
Y( IY ) = BETA*Y( IY )
IY = IY + INCY
40 CONTINUE
END IF
END IF
END IF
IF( ALPHA.EQ.ZERO )
$ RETURN
IF( LSAME( TRANS, 'N' ) )THEN
*
* FORM Y := ALPHA*A*X + Y.
*
JX = KX
IF( INCY.EQ.1 )THEN
DO 60, J = 1, N
IF( X( JX ).NE.ZERO )THEN
TEMP = ALPHA*X( JX )
DO 50, I = 1, M
Y( I ) = Y( I ) + TEMP*A( I, J )
50 CONTINUE
END IF
JX = JX + INCX
60 CONTINUE
ELSE
DO 80, J = 1, N
IF( X( JX ).NE.ZERO )THEN
TEMP = ALPHA*X( JX )
IY = KY
DO 70, I = 1, M
Y( IY ) = Y( IY ) + TEMP*A( I, J )
IY = IY + INCY
70 CONTINUE
END IF
JX = JX + INCX
80 CONTINUE
END IF
ELSE
*
* FORM Y := ALPHA*A'*X + Y.
*
JY = KY
IF( INCX.EQ.1 )THEN
DO 100, J = 1, N
TEMP = ZERO
DO 90, I = 1, M
TEMP = TEMP + A( I, J )*X( I )
90 CONTINUE
Y( JY ) = Y( JY ) + ALPHA*TEMP
JY = JY + INCY
100 CONTINUE
ELSE
DO 120, J = 1, N
TEMP = ZERO
IX = KX
DO 110, I = 1, M
TEMP = TEMP + A( I, J )*X( IX )
IX = IX + INCX
110 CONTINUE
Y( JY ) = Y( JY ) + ALPHA*TEMP
JY = JY + INCY
120 CONTINUE
END IF
END IF
*
RETURN
*
* END OF DGEMV .
*
END
SUBROUTINE DGER ( M, N, ALPHA, X, INCX, Y, INCY, A, LDA )
* .. SCALAR ARGUMENTS ..
DOUBLE PRECISION ALPHA
INTEGER INCX, INCY, LDA, M, N
* .. ARRAY ARGUMENTS ..
DOUBLE PRECISION A( LDA, * ), X( * ), Y( * )
* ..
*
* PURPOSE
* =======
*
* DGER PERFORMS THE RANK 1 OPERATION
*
* A := ALPHA*X*Y' + A,
*
* WHERE ALPHA IS A SCALAR, X IS AN M ELEMENT VECTOR, Y IS AN N ELEMENT
* VECTOR AND A IS AN M BY N MATRIX.
*
* PARAMETERS
* ==========
*
* M - INTEGER.
* ON ENTRY, M SPECIFIES THE NUMBER OF ROWS OF THE MATRIX A.
* M MUST BE AT LEAST ZERO.
* UNCHANGED ON EXIT.
*
* N - INTEGER.
* ON ENTRY, N SPECIFIES THE NUMBER OF COLUMNS OF THE MATRIX A.
* N MUST BE AT LEAST ZERO.
* UNCHANGED ON EXIT.
*
* ALPHA - DOUBLE PRECISION.
* ON ENTRY, ALPHA SPECIFIES THE SCALAR ALPHA.
* UNCHANGED ON EXIT.
*
* X - DOUBLE PRECISION ARRAY OF DIMENSION AT LEAST
* ( 1 + ( M - 1 )*ABS( INCX ) ).
* BEFORE ENTRY, THE INCREMENTED ARRAY X MUST CONTAIN THE M
* ELEMENT VECTOR X.
* UNCHANGED ON EXIT.
*
* INCX - INTEGER.
* ON ENTRY, INCX SPECIFIES THE INCREMENT FOR THE ELEMENTS OF
* X. INCX MUST NOT BE ZERO.
* UNCHANGED ON EXIT.
*
* Y - DOUBLE PRECISION ARRAY OF DIMENSION AT LEAST
* ( 1 + ( N - 1 )*ABS( INCY ) ).
* BEFORE ENTRY, THE INCREMENTED ARRAY Y MUST CONTAIN THE N
* ELEMENT VECTOR Y.
* UNCHANGED ON EXIT.
*
* INCY - INTEGER.
* ON ENTRY, INCY SPECIFIES THE INCREMENT FOR THE ELEMENTS OF
* Y. INCY MUST NOT BE ZERO.
* UNCHANGED ON EXIT.
*
* A - DOUBLE PRECISION ARRAY OF DIMENSION ( LDA, N ).
* BEFORE ENTRY, THE LEADING M BY N PART OF THE ARRAY A MUST
* CONTAIN THE MATRIX OF COEFFICIENTS. ON EXIT, A IS
* OVERWRITTEN BY THE UPDATED MATRIX.
*
* LDA - INTEGER.
* ON ENTRY, LDA SPECIFIES THE FIRST DIMENSION OF A AS DECLARED
* IN THE CALLING (SUB) PROGRAM. LDA MUST BE AT LEAST
* MAX( 1, M ).
* UNCHANGED ON EXIT.
*
*
* LEVEL 2 BLAS ROUTINE.
*
* -- WRITTEN ON 22-OCTOBER-1986.
* JACK DONGARRA, ARGONNE NATIONAL LAB.
* JEREMY DU CROZ, NAG CENTRAL OFFICE.
* SVEN HAMMARLING, NAG CENTRAL OFFICE.
* RICHARD HANSON, SANDIA NATIONAL LABS.
*
*
* .. PARAMETERS ..
DOUBLE PRECISION ZERO
PARAMETER ( ZERO = 0.0D+0 )
* .. LOCAL SCALARS ..
DOUBLE PRECISION TEMP
INTEGER I, INFO, IX, J, JY, KX
* .. EXTERNAL SUBROUTINES ..
EXTERNAL XERBLA
* .. INTRINSIC FUNCTIONS ..
INTRINSIC MAX
* ..
* .. EXECUTABLE STATEMENTS ..
*
* TEST THE INPUT PARAMETERS.
*
INFO = 0
IF ( M.LT.0 )THEN
INFO = 1
ELSE IF( N.LT.0 )THEN
INFO = 2
ELSE IF( INCX.EQ.0 )THEN
INFO = 5
ELSE IF( INCY.EQ.0 )THEN
INFO = 7
ELSE IF( LDA.LT.MAX( 1, M ) )THEN
INFO = 9
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'DGER ', INFO )
RETURN
END IF
*
* QUICK RETURN IF POSSIBLE.
*
IF( ( M.EQ.0 ).OR.( N.EQ.0 ).OR.( ALPHA.EQ.ZERO ) )
$ RETURN
*
* START THE OPERATIONS. IN THIS VERSION THE ELEMENTS OF A ARE
* ACCESSED SEQUENTIALLY WITH ONE PASS THROUGH A.
*
IF( INCY.GT.0 )THEN
JY = 1
ELSE
JY = 1 - ( N - 1 )*INCY
END IF
IF( INCX.EQ.1 )THEN
DO 20, J = 1, N
IF( Y( JY ).NE.ZERO )THEN
TEMP = ALPHA*Y( JY )
DO 10, I = 1, M
A( I, J ) = A( I, J ) + X( I )*TEMP
10 CONTINUE
END IF
JY = JY + INCY
20 CONTINUE
ELSE
IF( INCX.GT.0 )THEN
KX = 1
ELSE
KX = 1 - ( M - 1 )*INCX
END IF
DO 40, J = 1, N
IF( Y( JY ).NE.ZERO )THEN
TEMP = ALPHA*Y( JY )
IX = KX
DO 30, I = 1, M
A( I, J ) = A( I, J ) + X( IX )*TEMP
IX = IX + INCX
30 CONTINUE
END IF
JY = JY + INCY
40 CONTINUE
END IF
*
RETURN
*
* END OF DGER .
*
END
subroutine dscal(n,da,dx,incx)
c
c scales a vector by a constant.
c uses unrolled loops for increment equal to one.
c jack dongarra, linpack, 3/11/78.
c modified 3/93 to return if incx .le. 0.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double precision da,dx(*)
integer i,incx,m,mp1,n,nincx
c
if( n.le.0 .or. incx.le.0 )return
if(incx.eq.1)go to 20
c
c code for increment not equal to 1
c
nincx = n*incx
do 10 i = 1,nincx,incx
dx(i) = da*dx(i)
10 continue
return
c
c code for increment equal to 1
c
c
c clean-up loop
c
20 m = mod(n,5)
if( m .eq. 0 ) go to 40
do 30 i = 1,m
dx(i) = da*dx(i)
30 continue
if( n .lt. 5 ) return
40 mp1 = m + 1
do 50 i = mp1,n,5
dx(i) = da*dx(i)
dx(i + 1) = da*dx(i + 1)
dx(i + 2) = da*dx(i + 2)
dx(i + 3) = da*dx(i + 3)
dx(i + 4) = da*dx(i + 4)
50 continue
return
end
SUBROUTINE DSPMV ( UPLO, N, ALPHA, AP, X, INCX, BETA, Y, INCY )
* .. Scalar Arguments ..
DOUBLE PRECISION ALPHA, BETA
INTEGER INCX, INCY, N
CHARACTER*1 UPLO
* .. Array Arguments ..
DOUBLE PRECISION AP( * ), X( * ), Y( * )
* ..
*
* Purpose
* =======
*
* DSPMV performs the matrix-vector operation
*
* y := alpha*A*x + beta*y,
*
* where alpha and beta are scalars, x and y are n element vectors and
* A is an n by n symmetric matrix, supplied in packed form.
*
* Parameters
* ==========
*
* UPLO - CHARACTER*1.
* On entry, UPLO specifies whether the upper or lower
* triangular part of the matrix A is supplied in the packed
* array AP as follows:
*
* UPLO = 'U' or 'u' The upper triangular part of A is
* supplied in AP.
*
* UPLO = 'L' or 'l' The lower triangular part of A is
* supplied in AP.
*
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the order of the matrix A.
* N must be at least zero.
* Unchanged on exit.
*
* ALPHA - DOUBLE PRECISION.
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* AP - DOUBLE PRECISION array of DIMENSION at least
* ( ( n*( n + 1 ) )/2 ).
* Before entry with UPLO = 'U' or 'u', the array AP must
* contain the upper triangular part of the symmetric matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 )
* and a( 2, 2 ) respectively, and so on.
* Before entry with UPLO = 'L' or 'l', the array AP must
* contain the lower triangular part of the symmetric matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 )
* and a( 3, 1 ) respectively, and so on.
* Unchanged on exit.
*
* X - DOUBLE PRECISION array of dimension at least
* ( 1 + ( n - 1 )*abs( INCX ) ).
* Before entry, the incremented array X must contain the n
* element vector x.
* Unchanged on exit.
*
* INCX - INTEGER.
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
* Unchanged on exit.
*
* BETA - DOUBLE PRECISION.
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then Y need not be set on input.
* Unchanged on exit.
*
* Y - DOUBLE PRECISION array of dimension at least
* ( 1 + ( n - 1 )*abs( INCY ) ).
* Before entry, the incremented array Y must contain the n
* element vector y. On exit, Y is overwritten by the updated
* vector y.
*
* INCY - INTEGER.
* On entry, INCY specifies the increment for the elements of
* Y. INCY must not be zero.
* Unchanged on exit.
*
*
* Level 2 Blas routine.
*
* -- Written on 22-October-1986.
* Jack Dongarra, Argonne National Lab.
* Jeremy Du Croz, Nag Central Office.
* Sven Hammarling, Nag Central Office.
* Richard Hanson, Sandia National Labs.
*
*
* .. Parameters ..
DOUBLE PRECISION ONE , ZERO
PARAMETER ( ONE = 1.0D+0, ZERO = 0.0D+0 )
* .. Local Scalars ..
DOUBLE PRECISION TEMP1, TEMP2
INTEGER I, INFO, IX, IY, J, JX, JY, K, KK, KX, KY
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL XERBLA
* ..
* .. Executable Statements ..
*
* Test the input parameters.
*
INFO = 0
IF ( .NOT.LSAME( UPLO, 'U' ).AND.
$ .NOT.LSAME( UPLO, 'L' ) )THEN
INFO = 1
ELSE IF( N.LT.0 )THEN
INFO = 2
ELSE IF( INCX.EQ.0 )THEN
INFO = 6
ELSE IF( INCY.EQ.0 )THEN
INFO = 9
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'DSPMV ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( N.EQ.0 ).OR.( ( ALPHA.EQ.ZERO ).AND.( BETA.EQ.ONE ) ) )
$ RETURN
*
* Set up the start points in X and Y.
*
IF( INCX.GT.0 )THEN
KX = 1
ELSE
KX = 1 - ( N - 1 )*INCX
END IF
IF( INCY.GT.0 )THEN
KY = 1
ELSE
KY = 1 - ( N - 1 )*INCY
END IF
*
* Start the operations. In this version the elements of the array AP
* are accessed sequentially with one pass through AP.
*
* First form y := beta*y.
*
IF( BETA.NE.ONE )THEN
IF( INCY.EQ.1 )THEN
IF( BETA.EQ.ZERO )THEN
DO 10, I = 1, N
Y( I ) = ZERO
10 CONTINUE
ELSE
DO 20, I = 1, N
Y( I ) = BETA*Y( I )
20 CONTINUE
END IF
ELSE
IY = KY
IF( BETA.EQ.ZERO )THEN
DO 30, I = 1, N
Y( IY ) = ZERO
IY = IY + INCY
30 CONTINUE
ELSE
DO 40, I = 1, N
Y( IY ) = BETA*Y( IY )
IY = IY + INCY
40 CONTINUE
END IF
END IF
END IF
IF( ALPHA.EQ.ZERO )
$ RETURN
KK = 1
IF( LSAME( UPLO, 'U' ) )THEN
*
* Form y when AP contains the upper triangle.
*
IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN
DO 60, J = 1, N
TEMP1 = ALPHA*X( J )
TEMP2 = ZERO
K = KK
DO 50, I = 1, J - 1
Y( I ) = Y( I ) + TEMP1*AP( K )
TEMP2 = TEMP2 + AP( K )*X( I )
K = K + 1
50 CONTINUE
Y( J ) = Y( J ) + TEMP1*AP( KK + J - 1 ) + ALPHA*TEMP2
KK = KK + J
60 CONTINUE
ELSE
JX = KX
JY = KY
DO 80, J = 1, N
TEMP1 = ALPHA*X( JX )
TEMP2 = ZERO
IX = KX
IY = KY
DO 70, K = KK, KK + J - 2
Y( IY ) = Y( IY ) + TEMP1*AP( K )
TEMP2 = TEMP2 + AP( K )*X( IX )
IX = IX + INCX
IY = IY + INCY
70 CONTINUE
Y( JY ) = Y( JY ) + TEMP1*AP( KK + J - 1 ) + ALPHA*TEMP2
JX = JX + INCX
JY = JY + INCY
KK = KK + J
80 CONTINUE
END IF
ELSE
*
* Form y when AP contains the lower triangle.
*
IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN
DO 100, J = 1, N
TEMP1 = ALPHA*X( J )
TEMP2 = ZERO
Y( J ) = Y( J ) + TEMP1*AP( KK )
K = KK + 1
DO 90, I = J + 1, N
Y( I ) = Y( I ) + TEMP1*AP( K )
TEMP2 = TEMP2 + AP( K )*X( I )
K = K + 1
90 CONTINUE
Y( J ) = Y( J ) + ALPHA*TEMP2
KK = KK + ( N - J + 1 )
100 CONTINUE
ELSE
JX = KX
JY = KY
DO 120, J = 1, N
TEMP1 = ALPHA*X( JX )
TEMP2 = ZERO
Y( JY ) = Y( JY ) + TEMP1*AP( KK )
IX = JX
IY = JY
DO 110, K = KK + 1, KK + N - J
IX = IX + INCX
IY = IY + INCY
Y( IY ) = Y( IY ) + TEMP1*AP( K )
TEMP2 = TEMP2 + AP( K )*X( IX )
110 CONTINUE
Y( JY ) = Y( JY ) + ALPHA*TEMP2
JX = JX + INCX
JY = JY + INCY
KK = KK + ( N - J + 1 )
120 CONTINUE
END IF
END IF
*
RETURN
*
* End of DSPMV .
*
END
SUBROUTINE DSPR2 ( UPLO, N, ALPHA, X, INCX, Y, INCY, AP )
* .. Scalar Arguments ..
DOUBLE PRECISION ALPHA
INTEGER INCX, INCY, N
CHARACTER*1 UPLO
* .. Array Arguments ..
DOUBLE PRECISION AP( * ), X( * ), Y( * )
* ..
*
* Purpose
* =======
*
* DSPR2 performs the symmetric rank 2 operation
*
* A := alpha*x*y' + alpha*y*x' + A,
*
* where alpha is a scalar, x and y are n element vectors and A is an
* n by n symmetric matrix, supplied in packed form.
*
* Parameters
* ==========
*
* UPLO - CHARACTER*1.
* On entry, UPLO specifies whether the upper or lower
* triangular part of the matrix A is supplied in the packed
* array AP as follows:
*
* UPLO = 'U' or 'u' The upper triangular part of A is
* supplied in AP.
*
* UPLO = 'L' or 'l' The lower triangular part of A is
* supplied in AP.
*
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the order of the matrix A.
* N must be at least zero.
* Unchanged on exit.
*
* ALPHA - DOUBLE PRECISION.
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* X - DOUBLE PRECISION array of dimension at least
* ( 1 + ( n - 1 )*abs( INCX ) ).
* Before entry, the incremented array X must contain the n
* element vector x.
* Unchanged on exit.
*
* INCX - INTEGER.
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
* Unchanged on exit.
*
* Y - DOUBLE PRECISION array of dimension at least
* ( 1 + ( n - 1 )*abs( INCY ) ).
* Before entry, the incremented array Y must contain the n
* element vector y.
* Unchanged on exit.
*
* INCY - INTEGER.
* On entry, INCY specifies the increment for the elements of
* Y. INCY must not be zero.
* Unchanged on exit.
*
* AP - DOUBLE PRECISION array of DIMENSION at least
* ( ( n*( n + 1 ) )/2 ).
* Before entry with UPLO = 'U' or 'u', the array AP must
* contain the upper triangular part of the symmetric matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 )
* and a( 2, 2 ) respectively, and so on. On exit, the array
* AP is overwritten by the upper triangular part of the
* updated matrix.
* Before entry with UPLO = 'L' or 'l', the array AP must
* contain the lower triangular part of the symmetric matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 )
* and a( 3, 1 ) respectively, and so on. On exit, the array
* AP is overwritten by the lower triangular part of the
* updated matrix.
*
*
* Level 2 Blas routine.
*
* -- Written on 22-October-1986.
* Jack Dongarra, Argonne National Lab.
* Jeremy Du Croz, Nag Central Office.
* Sven Hammarling, Nag Central Office.
* Richard Hanson, Sandia National Labs.
*
*
* .. Parameters ..
DOUBLE PRECISION ZERO
PARAMETER ( ZERO = 0.0D+0 )
* .. Local Scalars ..
DOUBLE PRECISION TEMP1, TEMP2
INTEGER I, INFO, IX, IY, J, JX, JY, K, KK, KX, KY
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL XERBLA
* ..
* .. Executable Statements ..
*
* Test the input parameters.
*
INFO = 0
IF ( .NOT.LSAME( UPLO, 'U' ).AND.
$ .NOT.LSAME( UPLO, 'L' ) )THEN
INFO = 1
ELSE IF( N.LT.0 )THEN
INFO = 2
ELSE IF( INCX.EQ.0 )THEN
INFO = 5
ELSE IF( INCY.EQ.0 )THEN
INFO = 7
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'DSPR2 ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( N.EQ.0 ).OR.( ALPHA.EQ.ZERO ) )
$ RETURN
*
* Set up the start points in X and Y if the increments are not both
* unity.
*
IF( ( INCX.NE.1 ).OR.( INCY.NE.1 ) )THEN
IF( INCX.GT.0 )THEN
KX = 1
ELSE
KX = 1 - ( N - 1 )*INCX
END IF
IF( INCY.GT.0 )THEN
KY = 1
ELSE
KY = 1 - ( N - 1 )*INCY
END IF
JX = KX
JY = KY
END IF
*
* Start the operations. In this version the elements of the array AP
* are accessed sequentially with one pass through AP.
*
KK = 1
IF( LSAME( UPLO, 'U' ) )THEN
*
* Form A when upper triangle is stored in AP.
*
IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN
DO 20, J = 1, N
IF( ( X( J ).NE.ZERO ).OR.( Y( J ).NE.ZERO ) )THEN
TEMP1 = ALPHA*Y( J )
TEMP2 = ALPHA*X( J )
K = KK
DO 10, I = 1, J
AP( K ) = AP( K ) + X( I )*TEMP1 + Y( I )*TEMP2
K = K + 1
10 CONTINUE
END IF
KK = KK + J
20 CONTINUE
ELSE
DO 40, J = 1, N
IF( ( X( JX ).NE.ZERO ).OR.( Y( JY ).NE.ZERO ) )THEN
TEMP1 = ALPHA*Y( JY )
TEMP2 = ALPHA*X( JX )
IX = KX
IY = KY
DO 30, K = KK, KK + J - 1
AP( K ) = AP( K ) + X( IX )*TEMP1 + Y( IY )*TEMP2
IX = IX + INCX
IY = IY + INCY
30 CONTINUE
END IF
JX = JX + INCX
JY = JY + INCY
KK = KK + J
40 CONTINUE
END IF
ELSE
*
* Form A when lower triangle is stored in AP.
*
IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN
DO 60, J = 1, N
IF( ( X( J ).NE.ZERO ).OR.( Y( J ).NE.ZERO ) )THEN
TEMP1 = ALPHA*Y( J )
TEMP2 = ALPHA*X( J )
K = KK
DO 50, I = J, N
AP( K ) = AP( K ) + X( I )*TEMP1 + Y( I )*TEMP2
K = K + 1
50 CONTINUE
END IF
KK = KK + N - J + 1
60 CONTINUE
ELSE
DO 80, J = 1, N
IF( ( X( JX ).NE.ZERO ).OR.( Y( JY ).NE.ZERO ) )THEN
TEMP1 = ALPHA*Y( JY )
TEMP2 = ALPHA*X( JX )
IX = JX
IY = JY
DO 70, K = KK, KK + N - J
AP( K ) = AP( K ) + X( IX )*TEMP1 + Y( IY )*TEMP2
IX = IX + INCX
IY = IY + INCY
70 CONTINUE
END IF
JX = JX + INCX
JY = JY + INCY
KK = KK + N - J + 1
80 CONTINUE
END IF
END IF
*
RETURN
*
* End of DSPR2 .
*
END
subroutine dswap (n,dx,incx,dy,incy)
c
c interchanges two vectors.
c uses unrolled loops for increments equal one.
c jack dongarra, linpack, 3/11/78.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double precision dx(*),dy(*),dtemp
integer i,incx,incy,ix,iy,m,mp1,n
c
if(n.le.0)return
if(incx.eq.1.and.incy.eq.1)go to 20
c
c code for unequal increments or equal increments not equal
c to 1
c
ix = 1
iy = 1
if(incx.lt.0)ix = (-n+1)*incx + 1
if(incy.lt.0)iy = (-n+1)*incy + 1
do 10 i = 1,n
dtemp = dx(ix)
dx(ix) = dy(iy)
dy(iy) = dtemp
ix = ix + incx
iy = iy + incy
10 continue
return
c
c code for both increments equal to 1
c
c
c clean-up loop
c
20 m = mod(n,3)
if( m .eq. 0 ) go to 40
do 30 i = 1,m
dtemp = dx(i)
dx(i) = dy(i)
dy(i) = dtemp
30 continue
if( n .lt. 3 ) return
40 mp1 = m + 1
do 50 i = mp1,n,3
dtemp = dx(i)
dx(i) = dy(i)
dy(i) = dtemp
dtemp = dx(i + 1)
dx(i + 1) = dy(i + 1)
dy(i + 1) = dtemp
dtemp = dx(i + 2)
dx(i + 2) = dy(i + 2)
dy(i + 2) = dtemp
50 continue
return
end
subroutine zscal(n,za,zx,incx)
c
c scales a vector by a constant.
c jack dongarra, 3/11/78.
c modified 3/93 to return if incx .le. 0.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double complex za,zx(*)
integer i,incx,ix,n
c
if( n.le.0 .or. incx.le.0 )return
if(incx.eq.1)go to 20
c
c code for increment not equal to 1
c
ix = 1
do 10 i = 1,n
zx(ix) = za*zx(ix)
ix = ix + incx
10 continue
return
c
c code for increment equal to 1
c
20 do 30 i = 1,n
zx(i) = za*zx(i)
30 continue
return
end
integer function idamax(n,dx,incx)
c
c finds the index of element having max. absolute value.
c jack dongarra, linpack, 3/11/78.
c modified 3/93 to return if incx .le. 0.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double precision dx(*),dmax
integer i,incx,ix,n
c
idamax = 0
if( n.lt.1 .or. incx.le.0 ) return
idamax = 1
if(n.eq.1)return
if(incx.eq.1)go to 20
c
c code for increment not equal to 1
c
ix = 1
dmax = dabs(dx(1))
ix = ix + incx
do 10 i = 2,n
if(dabs(dx(ix)).le.dmax) go to 5
idamax = i
dmax = dabs(dx(ix))
5 ix = ix + incx
10 continue
return
c
c code for increment equal to 1
c
20 dmax = dabs(dx(1))
do 30 i = 2,n
if(dabs(dx(i)).le.dmax) go to 30
idamax = i
dmax = dabs(dx(i))
30 continue
return
end
SUBROUTINE ZGEMM ( TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB,
$ BETA, C, LDC )
* .. Scalar Arguments ..
CHARACTER*1 TRANSA, TRANSB
INTEGER M, N, K, LDA, LDB, LDC
COMPLEX*16 ALPHA, BETA
* .. Array Arguments ..
COMPLEX*16 A( LDA, * ), B( LDB, * ), C( LDC, * )
* ..
*
* Purpose
* =======
*
* ZGEMM performs one of the matrix-matrix operations
*
* C := alpha*op( A )*op( B ) + beta*C,
*
* where op( X ) is one of
*
* op( X ) = X or op( X ) = X' or op( X ) = conjg( X' ),
*
* alpha and beta are scalars, and A, B and C are matrices, with op( A )
* an m by k matrix, op( B ) a k by n matrix and C an m by n matrix.
*
* Parameters
* ==========
*
* TRANSA - CHARACTER*1.
* On entry, TRANSA specifies the form of op( A ) to be used in
* the matrix multiplication as follows:
*
* TRANSA = 'N' or 'n', op( A ) = A.
*
* TRANSA = 'T' or 't', op( A ) = A'.
*
* TRANSA = 'C' or 'c', op( A ) = conjg( A' ).
*
* Unchanged on exit.
*
* TRANSB - CHARACTER*1.
* On entry, TRANSB specifies the form of op( B ) to be used in
* the matrix multiplication as follows:
*
* TRANSB = 'N' or 'n', op( B ) = B.
*
* TRANSB = 'T' or 't', op( B ) = B'.
*
* TRANSB = 'C' or 'c', op( B ) = conjg( B' ).
*
* Unchanged on exit.
*
* M - INTEGER.
* On entry, M specifies the number of rows of the matrix
* op( A ) and of the matrix C. M must be at least zero.
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the number of columns of the matrix
* op( B ) and the number of columns of the matrix C. N must be
* at least zero.
* Unchanged on exit.
*
* K - INTEGER.
* On entry, K specifies the number of columns of the matrix
* op( A ) and the number of rows of the matrix op( B ). K must
* be at least zero.
* Unchanged on exit.
*
* ALPHA - COMPLEX*16 .
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* A - COMPLEX*16 array of DIMENSION ( LDA, ka ), where ka is
* k when TRANSA = 'N' or 'n', and is m otherwise.
* Before entry with TRANSA = 'N' or 'n', the leading m by k
* part of the array A must contain the matrix A, otherwise
* the leading k by m part of the array A must contain the
* matrix A.
* Unchanged on exit.
*
* LDA - INTEGER.
* On entry, LDA specifies the first dimension of A as declared
* in the calling (sub) program. When TRANSA = 'N' or 'n' then
* LDA must be at least max( 1, m ), otherwise LDA must be at
* least max( 1, k ).
* Unchanged on exit.
*
* B - COMPLEX*16 array of DIMENSION ( LDB, kb ), where kb is
* n when TRANSB = 'N' or 'n', and is k otherwise.
* Before entry with TRANSB = 'N' or 'n', the leading k by n
* part of the array B must contain the matrix B, otherwise
* the leading n by k part of the array B must contain the
* matrix B.
* Unchanged on exit.
*
* LDB - INTEGER.
* On entry, LDB specifies the first dimension of B as declared
* in the calling (sub) program. When TRANSB = 'N' or 'n' then
* LDB must be at least max( 1, k ), otherwise LDB must be at
* least max( 1, n ).
* Unchanged on exit.
*
* BETA - COMPLEX*16 .
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then C need not be set on input.
* Unchanged on exit.
*
* C - COMPLEX*16 array of DIMENSION ( LDC, n ).
* Before entry, the leading m by n part of the array C must
* contain the matrix C, except when beta is zero, in which
* case C need not be set on entry.
* On exit, the array C is overwritten by the m by n matrix
* ( alpha*op( A )*op( B ) + beta*C ).
*
* LDC - INTEGER.
* On entry, LDC specifies the first dimension of C as declared
* in the calling (sub) program. LDC must be at least
* max( 1, m ).
* Unchanged on exit.
*
*
* Level 3 Blas routine.
*
* -- Written on 8-February-1989.
* Jack Dongarra, Argonne National Laboratory.
* Iain Duff, AERE Harwell.
* Jeremy Du Croz, Numerical Algorithms Group Ltd.
* Sven Hammarling, Numerical Algorithms Group Ltd.
*
*
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL XERBLA
* .. Intrinsic Functions ..
INTRINSIC DCONJG, MAX
* .. Local Scalars ..
LOGICAL CONJA, CONJB, NOTA, NOTB
INTEGER I, INFO, J, L, NCOLA, NROWA, NROWB
COMPLEX*16 TEMP
* .. Parameters ..
COMPLEX*16 ONE
PARAMETER ( ONE = ( 1.0D+0, 0.0D+0 ) )
COMPLEX*16 ZERO
PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ) )
* ..
* .. Executable Statements ..
*
* Set NOTA and NOTB as true if A and B respectively are not
* conjugated or transposed, set CONJA and CONJB as true if A and
* B respectively are to be transposed but not conjugated and set
* NROWA, NCOLA and NROWB as the number of rows and columns of A
* and the number of rows of B respectively.
*
NOTA = LSAME( TRANSA, 'N' )
NOTB = LSAME( TRANSB, 'N' )
CONJA = LSAME( TRANSA, 'C' )
CONJB = LSAME( TRANSB, 'C' )
IF( NOTA )THEN
NROWA = M
NCOLA = K
ELSE
NROWA = K
NCOLA = M
END IF
IF( NOTB )THEN
NROWB = K
ELSE
NROWB = N
END IF
*
* Test the input parameters.
*
INFO = 0
IF( ( .NOT.NOTA ).AND.
$ ( .NOT.CONJA ).AND.
$ ( .NOT.LSAME( TRANSA, 'T' ) ) )THEN
INFO = 1
ELSE IF( ( .NOT.NOTB ).AND.
$ ( .NOT.CONJB ).AND.
$ ( .NOT.LSAME( TRANSB, 'T' ) ) )THEN
INFO = 2
ELSE IF( M .LT.0 )THEN
INFO = 3
ELSE IF( N .LT.0 )THEN
INFO = 4
ELSE IF( K .LT.0 )THEN
INFO = 5
ELSE IF( LDA.LT.MAX( 1, NROWA ) )THEN
INFO = 8
ELSE IF( LDB.LT.MAX( 1, NROWB ) )THEN
INFO = 10
ELSE IF( LDC.LT.MAX( 1, M ) )THEN
INFO = 13
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'ZGEMM ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( M.EQ.0 ).OR.( N.EQ.0 ).OR.
$ ( ( ( ALPHA.EQ.ZERO ).OR.( K.EQ.0 ) ).AND.( BETA.EQ.ONE ) ) )
$ RETURN
*
* And when alpha.eq.zero.
*
IF( ALPHA.EQ.ZERO )THEN
IF( BETA.EQ.ZERO )THEN
DO 20, J = 1, N
DO 10, I = 1, M
C( I, J ) = ZERO
10 CONTINUE
20 CONTINUE
ELSE
DO 40, J = 1, N
DO 30, I = 1, M
C( I, J ) = BETA*C( I, J )
30 CONTINUE
40 CONTINUE
END IF
RETURN
END IF
*
* Start the operations.
*
IF( NOTB )THEN
IF( NOTA )THEN
*
* Form C := alpha*A*B + beta*C.
*
DO 90, J = 1, N
IF( BETA.EQ.ZERO )THEN
DO 50, I = 1, M
C( I, J ) = ZERO
50 CONTINUE
ELSE IF( BETA.NE.ONE )THEN
DO 60, I = 1, M
C( I, J ) = BETA*C( I, J )
60 CONTINUE
END IF
DO 80, L = 1, K
IF( B( L, J ).NE.ZERO )THEN
TEMP = ALPHA*B( L, J )
DO 70, I = 1, M
C( I, J ) = C( I, J ) + TEMP*A( I, L )
70 CONTINUE
END IF
80 CONTINUE
90 CONTINUE
ELSE IF( CONJA )THEN
*
* Form C := alpha*conjg( A' )*B + beta*C.
*
DO 120, J = 1, N
DO 110, I = 1, M
TEMP = ZERO
DO 100, L = 1, K
TEMP = TEMP + DCONJG( A( L, I ) )*B( L, J )
100 CONTINUE
IF( BETA.EQ.ZERO )THEN
C( I, J ) = ALPHA*TEMP
ELSE
C( I, J ) = ALPHA*TEMP + BETA*C( I, J )
END IF
110 CONTINUE
120 CONTINUE
ELSE
*
* Form C := alpha*A'*B + beta*C
*
DO 150, J = 1, N
DO 140, I = 1, M
TEMP = ZERO
DO 130, L = 1, K
TEMP = TEMP + A( L, I )*B( L, J )
130 CONTINUE
IF( BETA.EQ.ZERO )THEN
C( I, J ) = ALPHA*TEMP
ELSE
C( I, J ) = ALPHA*TEMP + BETA*C( I, J )
END IF
140 CONTINUE
150 CONTINUE
END IF
ELSE IF( NOTA )THEN
IF( CONJB )THEN
*
* Form C := alpha*A*conjg( B' ) + beta*C.
*
DO 200, J = 1, N
IF( BETA.EQ.ZERO )THEN
DO 160, I = 1, M
C( I, J ) = ZERO
160 CONTINUE
ELSE IF( BETA.NE.ONE )THEN
DO 170, I = 1, M
C( I, J ) = BETA*C( I, J )
170 CONTINUE
END IF
DO 190, L = 1, K
IF( B( J, L ).NE.ZERO )THEN
TEMP = ALPHA*DCONJG( B( J, L ) )
DO 180, I = 1, M
C( I, J ) = C( I, J ) + TEMP*A( I, L )
180 CONTINUE
END IF
190 CONTINUE
200 CONTINUE
ELSE
*
* Form C := alpha*A*B' + beta*C
*
DO 250, J = 1, N
IF( BETA.EQ.ZERO )THEN
DO 210, I = 1, M
C( I, J ) = ZERO
210 CONTINUE
ELSE IF( BETA.NE.ONE )THEN
DO 220, I = 1, M
C( I, J ) = BETA*C( I, J )
220 CONTINUE
END IF
DO 240, L = 1, K
IF( B( J, L ).NE.ZERO )THEN
TEMP = ALPHA*B( J, L )
DO 230, I = 1, M
C( I, J ) = C( I, J ) + TEMP*A( I, L )
230 CONTINUE
END IF
240 CONTINUE
250 CONTINUE
END IF
ELSE IF( CONJA )THEN
IF( CONJB )THEN
*
* Form C := alpha*conjg( A' )*conjg( B' ) + beta*C.
*
DO 280, J = 1, N
DO 270, I = 1, M
TEMP = ZERO
DO 260, L = 1, K
TEMP = TEMP +
$ DCONJG( A( L, I ) )*DCONJG( B( J, L ) )
260 CONTINUE
IF( BETA.EQ.ZERO )THEN
C( I, J ) = ALPHA*TEMP
ELSE
C( I, J ) = ALPHA*TEMP + BETA*C( I, J )
END IF
270 CONTINUE
280 CONTINUE
ELSE
*
* Form C := alpha*conjg( A' )*B' + beta*C
*
DO 310, J = 1, N
DO 300, I = 1, M
TEMP = ZERO
DO 290, L = 1, K
TEMP = TEMP + DCONJG( A( L, I ) )*B( J, L )
290 CONTINUE
IF( BETA.EQ.ZERO )THEN
C( I, J ) = ALPHA*TEMP
ELSE
C( I, J ) = ALPHA*TEMP + BETA*C( I, J )
END IF
300 CONTINUE
310 CONTINUE
END IF
ELSE
IF( CONJB )THEN
*
* Form C := alpha*A'*conjg( B' ) + beta*C
*
DO 340, J = 1, N
DO 330, I = 1, M
TEMP = ZERO
DO 320, L = 1, K
TEMP = TEMP + A( L, I )*DCONJG( B( J, L ) )
320 CONTINUE
IF( BETA.EQ.ZERO )THEN
C( I, J ) = ALPHA*TEMP
ELSE
C( I, J ) = ALPHA*TEMP + BETA*C( I, J )
END IF
330 CONTINUE
340 CONTINUE
ELSE
*
* Form C := alpha*A'*B' + beta*C
*
DO 370, J = 1, N
DO 360, I = 1, M
TEMP = ZERO
DO 350, L = 1, K
TEMP = TEMP + A( L, I )*B( J, L )
350 CONTINUE
IF( BETA.EQ.ZERO )THEN
C( I, J ) = ALPHA*TEMP
ELSE
C( I, J ) = ALPHA*TEMP + BETA*C( I, J )
END IF
360 CONTINUE
370 CONTINUE
END IF
END IF
*
RETURN
*
* End of ZGEMM .
*
END
subroutine zswap (n,zx,incx,zy,incy)
c
c interchanges two vectors.
c jack dongarra, 3/11/78.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double complex zx(*),zy(*),ztemp
integer i,incx,incy,ix,iy,n
c
if(n.le.0)return
if(incx.eq.1.and.incy.eq.1)go to 20
c
c code for unequal increments or equal increments not equal
c to 1
c
ix = 1
iy = 1
if(incx.lt.0)ix = (-n+1)*incx + 1
if(incy.lt.0)iy = (-n+1)*incy + 1
do 10 i = 1,n
ztemp = zx(ix)
zx(ix) = zy(iy)
zy(iy) = ztemp
ix = ix + incx
iy = iy + incy
10 continue
return
c
c code for both increments equal to 1
20 do 30 i = 1,n
ztemp = zx(i)
zx(i) = zy(i)
zy(i) = ztemp
30 continue
return
end
subroutine zaxpy(n,za,zx,incx,zy,incy)
c
c constant times a vector plus a vector.
c jack dongarra, 3/11/78.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double complex zx(*),zy(*),za
integer i,incx,incy,ix,iy,n
double precision dcabs1
if(n.le.0)return
if (dcabs1(za) .eq. 0.0d0) return
if (incx.eq.1.and.incy.eq.1)go to 20
c
c code for unequal increments or equal increments
c not equal to 1
c
ix = 1
iy = 1
if(incx.lt.0)ix = (-n+1)*incx + 1
if(incy.lt.0)iy = (-n+1)*incy + 1
do 10 i = 1,n
zy(iy) = zy(iy) + za*zx(ix)
ix = ix + incx
iy = iy + incy
10 continue
return
c
c code for both increments equal to 1
c
20 do 30 i = 1,n
zy(i) = zy(i) + za*zx(i)
30 continue
return
end
subroutine zdscal(n,da,zx,incx)
c
c scales a vector by a constant.
c jack dongarra, 3/11/78.
c modified 3/93 to return if incx .le. 0.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double complex zx(*)
double precision da
integer i,incx,ix,n
c
if( n.le.0 .or. incx.le.0 )return
if(incx.eq.1)go to 20
c
c code for increment not equal to 1
c
ix = 1
do 10 i = 1,n
zx(ix) = dcmplx(da,0.0d0)*zx(ix)
ix = ix + incx
10 continue
return
c
c code for increment equal to 1
c
20 do 30 i = 1,n
zx(i) = dcmplx(da,0.0d0)*zx(i)
30 continue
return
end
DOUBLE PRECISION FUNCTION DZNRM2( N, X, INCX )
* .. Scalar Arguments ..
INTEGER INCX, N
* .. Array Arguments ..
COMPLEX*16 X( * )
* ..
*
* DZNRM2 returns the euclidean norm of a vector via the function
* name, so that
*
* DZNRM2 := sqrt( conjg( x' )*x )
*
*
*
* -- This version written on 25-October-1982.
* Modified on 14-October-1993 to inline the call to ZLASSQ.
* Sven Hammarling, Nag Ltd.
*
*
* .. Parameters ..
DOUBLE PRECISION ONE , ZERO
PARAMETER ( ONE = 1.0D+0, ZERO = 0.0D+0 )
* .. Local Scalars ..
INTEGER IX
DOUBLE PRECISION NORM, SCALE, SSQ, TEMP
* .. Intrinsic Functions ..
INTRINSIC ABS, DIMAG, DBLE, SQRT
* ..
* .. Executable Statements ..
IF( N.LT.1 .OR. INCX.LT.1 )THEN
NORM = ZERO
ELSE
SCALE = ZERO
SSQ = ONE
* The following loop is equivalent to this call to the LAPACK
* auxiliary routine:
* CALL ZLASSQ( N, X, INCX, SCALE, SSQ )
*
DO 10, IX = 1, 1 + ( N - 1 )*INCX, INCX
IF( DBLE( X( IX ) ).NE.ZERO )THEN
TEMP = ABS( DBLE( X( IX ) ) )
IF( SCALE.LT.TEMP )THEN
SSQ = ONE + SSQ*( SCALE/TEMP )**2
SCALE = TEMP
ELSE
SSQ = SSQ + ( TEMP/SCALE )**2
END IF
END IF
IF( DIMAG( X( IX ) ).NE.ZERO )THEN
TEMP = ABS( DIMAG( X( IX ) ) )
IF( SCALE.LT.TEMP )THEN
SSQ = ONE + SSQ*( SCALE/TEMP )**2
SCALE = TEMP
ELSE
SSQ = SSQ + ( TEMP/SCALE )**2
END IF
END IF
10 CONTINUE
NORM = SCALE * SQRT( SSQ )
END IF
*
DZNRM2 = NORM
RETURN
*
* End of DZNRM2.
*
END
SUBROUTINE ZGEMV ( TRANS, M, N, ALPHA, A, LDA, X, INCX,
$ BETA, Y, INCY )
* .. Scalar Arguments ..
COMPLEX*16 ALPHA, BETA
INTEGER INCX, INCY, LDA, M, N
CHARACTER*1 TRANS
* .. Array Arguments ..
COMPLEX*16 A( LDA, * ), X( * ), Y( * )
* ..
*
* Purpose
* =======
*
* ZGEMV performs one of the matrix-vector operations
*
* y := alpha*A*x + beta*y, or y := alpha*A'*x + beta*y, or
*
* y := alpha*conjg( A' )*x + beta*y,
*
* where alpha and beta are scalars, x and y are vectors and A is an
* m by n matrix.
*
* Parameters
* ==========
*
* TRANS - CHARACTER*1.
* On entry, TRANS specifies the operation to be performed as
* follows:
*
* TRANS = 'N' or 'n' y := alpha*A*x + beta*y.
*
* TRANS = 'T' or 't' y := alpha*A'*x + beta*y.
*
* TRANS = 'C' or 'c' y := alpha*conjg( A' )*x + beta*y.
*
* Unchanged on exit.
*
* M - INTEGER.
* On entry, M specifies the number of rows of the matrix A.
* M must be at least zero.
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the number of columns of the matrix A.
* N must be at least zero.
* Unchanged on exit.
*
* ALPHA - COMPLEX*16 .
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* A - COMPLEX*16 array of DIMENSION ( LDA, n ).
* Before entry, the leading m by n part of the array A must
* contain the matrix of coefficients.
* Unchanged on exit.
*
* LDA - INTEGER.
* On entry, LDA specifies the first dimension of A as declared
* in the calling (sub) program. LDA must be at least
* max( 1, m ).
* Unchanged on exit.
*
* X - COMPLEX*16 array of DIMENSION at least
* ( 1 + ( n - 1 )*abs( INCX ) ) when TRANS = 'N' or 'n'
* and at least
* ( 1 + ( m - 1 )*abs( INCX ) ) otherwise.
* Before entry, the incremented array X must contain the
* vector x.
* Unchanged on exit.
*
* INCX - INTEGER.
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
* Unchanged on exit.
*
* BETA - COMPLEX*16 .
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then Y need not be set on input.
* Unchanged on exit.
*
* Y - COMPLEX*16 array of DIMENSION at least
* ( 1 + ( m - 1 )*abs( INCY ) ) when TRANS = 'N' or 'n'
* and at least
* ( 1 + ( n - 1 )*abs( INCY ) ) otherwise.
* Before entry with BETA non-zero, the incremented array Y
* must contain the vector y. On exit, Y is overwritten by the
* updated vector y.
*
* INCY - INTEGER.
* On entry, INCY specifies the increment for the elements of
* Y. INCY must not be zero.
* Unchanged on exit.
*
*
* Level 2 Blas routine.
*
* -- Written on 22-October-1986.
* Jack Dongarra, Argonne National Lab.
* Jeremy Du Croz, Nag Central Office.
* Sven Hammarling, Nag Central Office.
* Richard Hanson, Sandia National Labs.
*
*
* .. Parameters ..
COMPLEX*16 ONE
PARAMETER ( ONE = ( 1.0D+0, 0.0D+0 ) )
COMPLEX*16 ZERO
PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ) )
* .. Local Scalars ..
COMPLEX*16 TEMP
INTEGER I, INFO, IX, IY, J, JX, JY, KX, KY, LENX, LENY
LOGICAL NOCONJ
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL XERBLA
* .. Intrinsic Functions ..
INTRINSIC DCONJG, MAX
* ..
* .. Executable Statements ..
*
* Test the input parameters.
*
INFO = 0
IF ( .NOT.LSAME( TRANS, 'N' ).AND.
$ .NOT.LSAME( TRANS, 'T' ).AND.
$ .NOT.LSAME( TRANS, 'C' ) )THEN
INFO = 1
ELSE IF( M.LT.0 )THEN
INFO = 2
ELSE IF( N.LT.0 )THEN
INFO = 3
ELSE IF( LDA.LT.MAX( 1, M ) )THEN
INFO = 6
ELSE IF( INCX.EQ.0 )THEN
INFO = 8
ELSE IF( INCY.EQ.0 )THEN
INFO = 11
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'ZGEMV ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( M.EQ.0 ).OR.( N.EQ.0 ).OR.
$ ( ( ALPHA.EQ.ZERO ).AND.( BETA.EQ.ONE ) ) )
$ RETURN
*
NOCONJ = LSAME( TRANS, 'T' )
*
* Set LENX and LENY, the lengths of the vectors x and y, and set
* up the start points in X and Y.
*
IF( LSAME( TRANS, 'N' ) )THEN
LENX = N
LENY = M
ELSE
LENX = M
LENY = N
END IF
IF( INCX.GT.0 )THEN
KX = 1
ELSE
KX = 1 - ( LENX - 1 )*INCX
END IF
IF( INCY.GT.0 )THEN
KY = 1
ELSE
KY = 1 - ( LENY - 1 )*INCY
END IF
*
* Start the operations. In this version the elements of A are
* accessed sequentially with one pass through A.
*
* First form y := beta*y.
*
IF( BETA.NE.ONE )THEN
IF( INCY.EQ.1 )THEN
IF( BETA.EQ.ZERO )THEN
DO 10, I = 1, LENY
Y( I ) = ZERO
10 CONTINUE
ELSE
DO 20, I = 1, LENY
Y( I ) = BETA*Y( I )
20 CONTINUE
END IF
ELSE
IY = KY
IF( BETA.EQ.ZERO )THEN
DO 30, I = 1, LENY
Y( IY ) = ZERO
IY = IY + INCY
30 CONTINUE
ELSE
DO 40, I = 1, LENY
Y( IY ) = BETA*Y( IY )
IY = IY + INCY
40 CONTINUE
END IF
END IF
END IF
IF( ALPHA.EQ.ZERO )
$ RETURN
IF( LSAME( TRANS, 'N' ) )THEN
*
* Form y := alpha*A*x + y.
*
JX = KX
IF( INCY.EQ.1 )THEN
DO 60, J = 1, N
IF( X( JX ).NE.ZERO )THEN
TEMP = ALPHA*X( JX )
DO 50, I = 1, M
Y( I ) = Y( I ) + TEMP*A( I, J )
50 CONTINUE
END IF
JX = JX + INCX
60 CONTINUE
ELSE
DO 80, J = 1, N
IF( X( JX ).NE.ZERO )THEN
TEMP = ALPHA*X( JX )
IY = KY
DO 70, I = 1, M
Y( IY ) = Y( IY ) + TEMP*A( I, J )
IY = IY + INCY
70 CONTINUE
END IF
JX = JX + INCX
80 CONTINUE
END IF
ELSE
*
* Form y := alpha*A'*x + y or y := alpha*conjg( A' )*x + y.
*
JY = KY
IF( INCX.EQ.1 )THEN
DO 110, J = 1, N
TEMP = ZERO
IF( NOCONJ )THEN
DO 90, I = 1, M
TEMP = TEMP + A( I, J )*X( I )
90 CONTINUE
ELSE
DO 100, I = 1, M
TEMP = TEMP + DCONJG( A( I, J ) )*X( I )
100 CONTINUE
END IF
Y( JY ) = Y( JY ) + ALPHA*TEMP
JY = JY + INCY
110 CONTINUE
ELSE
DO 140, J = 1, N
TEMP = ZERO
IX = KX
IF( NOCONJ )THEN
DO 120, I = 1, M
TEMP = TEMP + A( I, J )*X( IX )
IX = IX + INCX
120 CONTINUE
ELSE
DO 130, I = 1, M
TEMP = TEMP + DCONJG( A( I, J ) )*X( IX )
IX = IX + INCX
130 CONTINUE
END IF
Y( JY ) = Y( JY ) + ALPHA*TEMP
JY = JY + INCY
140 CONTINUE
END IF
END IF
*
RETURN
*
* End of ZGEMV .
*
END
subroutine zcopy(n,zx,incx,zy,incy)
c
c copies a vector, x, to a vector, y.
c jack dongarra, linpack, 4/11/78.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double complex zx(*),zy(*)
integer i,incx,incy,ix,iy,n
c
if(n.le.0)return
if(incx.eq.1.and.incy.eq.1)go to 20
c
c code for unequal increments or equal increments
c not equal to 1
c
ix = 1
iy = 1
if(incx.lt.0)ix = (-n+1)*incx + 1
if(incy.lt.0)iy = (-n+1)*incy + 1
do 10 i = 1,n
zy(iy) = zx(ix)
ix = ix + incx
iy = iy + incy
10 continue
return
c
c code for both increments equal to 1
c
20 do 30 i = 1,n
zy(i) = zx(i)
30 continue
return
end
subroutine dcopy(n,dx,incx,dy,incy)
c
c copies a vector, x, to a vector, y.
c uses unrolled loops for increments equal to one.
c jack dongarra, linpack, 3/11/78.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double precision dx(*),dy(*)
integer i,incx,incy,ix,iy,m,mp1,n
c
if(n.le.0)return
if(incx.eq.1.and.incy.eq.1)go to 20
c
c code for unequal increments or equal increments
c not equal to 1
c
ix = 1
iy = 1
if(incx.lt.0)ix = (-n+1)*incx + 1
if(incy.lt.0)iy = (-n+1)*incy + 1
do 10 i = 1,n
dy(iy) = dx(ix)
ix = ix + incx
iy = iy + incy
10 continue
return
c
c code for both increments equal to 1
c
c
c clean-up loop
c
20 m = mod(n,7)
if( m .eq. 0 ) go to 40
do 30 i = 1,m
dy(i) = dx(i)
30 continue
if( n .lt. 7 ) return
40 mp1 = m + 1
do 50 i = mp1,n,7
dy(i) = dx(i)
dy(i + 1) = dx(i + 1)
dy(i + 2) = dx(i + 2)
dy(i + 3) = dx(i + 3)
dy(i + 4) = dx(i + 4)
dy(i + 5) = dx(i + 5)
dy(i + 6) = dx(i + 6)
50 continue
return
end
double complex function zdotu(n,zx,incx,zy,incy)
c
c forms the dot product of two vectors.
c jack dongarra, 3/11/78.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double complex zx(*),zy(*),ztemp
integer i,incx,incy,ix,iy,n
ztemp = (0.0d0,0.0d0)
zdotu = (0.0d0,0.0d0)
if(n.le.0)return
if(incx.eq.1.and.incy.eq.1)go to 20
c
c code for unequal increments or equal increments
c not equal to 1
c
ix = 1
iy = 1
if(incx.lt.0)ix = (-n+1)*incx + 1
if(incy.lt.0)iy = (-n+1)*incy + 1
do 10 i = 1,n
ztemp = ztemp + zx(ix)*zy(iy)
ix = ix + incx
iy = iy + incy
10 continue
zdotu = ztemp
return
c
c code for both increments equal to 1
c
20 do 30 i = 1,n
ztemp = ztemp + zx(i)*zy(i)
30 continue
zdotu = ztemp
return
end
double precision function dcabs1(z)
double complex z,zz
double precision t(2)
equivalence (zz,t(1))
zz = z
dcabs1 = dabs(t(1)) + dabs(t(2))
return
end
integer function izamax(n,zx,incx)
c
c finds the index of element having max. absolute value.
c jack dongarra, 1/15/85.
c modified 3/93 to return if incx .le. 0.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double complex zx(*)
double precision smax
integer i,incx,ix,n
double precision dcabs1
c
izamax = 0
if( n.lt.1 .or. incx.le.0 )return
izamax = 1
if(n.eq.1)return
if(incx.eq.1)go to 20
c
c code for increment not equal to 1
c
ix = 1
smax = dcabs1(zx(1))
ix = ix + incx
do 10 i = 2,n
if(dcabs1(zx(ix)).le.smax) go to 5
izamax = i
smax = dcabs1(zx(ix))
5 ix = ix + incx
10 continue
return
c
c code for increment equal to 1
c
20 smax = dcabs1(zx(1))
do 30 i = 2,n
if(dcabs1(zx(i)).le.smax) go to 30
izamax = i
smax = dcabs1(zx(i))
30 continue
return
end
SUBROUTINE ZGERU ( M, N, ALPHA, X, INCX, Y, INCY, A, LDA )
* .. Scalar Arguments ..
COMPLEX*16 ALPHA
INTEGER INCX, INCY, LDA, M, N
* .. Array Arguments ..
COMPLEX*16 A( LDA, * ), X( * ), Y( * )
* ..
*
* Purpose
* =======
*
* ZGERU performs the rank 1 operation
*
* A := alpha*x*y' + A,
*
* where alpha is a scalar, x is an m element vector, y is an n element
* vector and A is an m by n matrix.
*
* Parameters
* ==========
*
* M - INTEGER.
* On entry, M specifies the number of rows of the matrix A.
* M must be at least zero.
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the number of columns of the matrix A.
* N must be at least zero.
* Unchanged on exit.
*
* ALPHA - COMPLEX*16 .
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* X - COMPLEX*16 array of dimension at least
* ( 1 + ( m - 1 )*abs( INCX ) ).
* Before entry, the incremented array X must contain the m
* element vector x.
* Unchanged on exit.
*
* INCX - INTEGER.
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
* Unchanged on exit.
*
* Y - COMPLEX*16 array of dimension at least
* ( 1 + ( n - 1 )*abs( INCY ) ).
* Before entry, the incremented array Y must contain the n
* element vector y.
* Unchanged on exit.
*
* INCY - INTEGER.
* On entry, INCY specifies the increment for the elements of
* Y. INCY must not be zero.
* Unchanged on exit.
*
* A - COMPLEX*16 array of DIMENSION ( LDA, n ).
* Before entry, the leading m by n part of the array A must
* contain the matrix of coefficients. On exit, A is
* overwritten by the updated matrix.
*
* LDA - INTEGER.
* On entry, LDA specifies the first dimension of A as declared
* in the calling (sub) program. LDA must be at least
* max( 1, m ).
* Unchanged on exit.
*
*
* Level 2 Blas routine.
*
* -- Written on 22-October-1986.
* Jack Dongarra, Argonne National Lab.
* Jeremy Du Croz, Nag Central Office.
* Sven Hammarling, Nag Central Office.
* Richard Hanson, Sandia National Labs.
*
*
* .. Parameters ..
COMPLEX*16 ZERO
PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ) )
* .. Local Scalars ..
COMPLEX*16 TEMP
INTEGER I, INFO, IX, J, JY, KX
* .. External Subroutines ..
EXTERNAL XERBLA
* .. Intrinsic Functions ..
INTRINSIC MAX
* ..
* .. Executable Statements ..
*
* Test the input parameters.
*
INFO = 0
IF ( M.LT.0 )THEN
INFO = 1
ELSE IF( N.LT.0 )THEN
INFO = 2
ELSE IF( INCX.EQ.0 )THEN
INFO = 5
ELSE IF( INCY.EQ.0 )THEN
INFO = 7
ELSE IF( LDA.LT.MAX( 1, M ) )THEN
INFO = 9
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'ZGERU ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( M.EQ.0 ).OR.( N.EQ.0 ).OR.( ALPHA.EQ.ZERO ) )
$ RETURN
*
* Start the operations. In this version the elements of A are
* accessed sequentially with one pass through A.
*
IF( INCY.GT.0 )THEN
JY = 1
ELSE
JY = 1 - ( N - 1 )*INCY
END IF
IF( INCX.EQ.1 )THEN
DO 20, J = 1, N
IF( Y( JY ).NE.ZERO )THEN
TEMP = ALPHA*Y( JY )
DO 10, I = 1, M
A( I, J ) = A( I, J ) + X( I )*TEMP
10 CONTINUE
END IF
JY = JY + INCY
20 CONTINUE
ELSE
IF( INCX.GT.0 )THEN
KX = 1
ELSE
KX = 1 - ( M - 1 )*INCX
END IF
DO 40, J = 1, N
IF( Y( JY ).NE.ZERO )THEN
TEMP = ALPHA*Y( JY )
IX = KX
DO 30, I = 1, M
A( I, J ) = A( I, J ) + X( IX )*TEMP
IX = IX + INCX
30 CONTINUE
END IF
JY = JY + INCY
40 CONTINUE
END IF
*
RETURN
*
* End of ZGERU .
*
END
SUBROUTINE DSPR ( UPLO, N, ALPHA, X, INCX, AP )
* .. Scalar Arguments ..
DOUBLE PRECISION ALPHA
INTEGER INCX, N
CHARACTER*1 UPLO
* .. Array Arguments ..
DOUBLE PRECISION AP( * ), X( * )
* ..
*
* Purpose
* =======
*
* DSPR performs the symmetric rank 1 operation
*
* A := alpha*x*x' + A,
*
* where alpha is a real scalar, x is an n element vector and A is an
* n by n symmetric matrix, supplied in packed form.
*
* Parameters
* ==========
*
* UPLO - CHARACTER*1.
* On entry, UPLO specifies whether the upper or lower
* triangular part of the matrix A is supplied in the packed
* array AP as follows:
*
* UPLO = 'U' or 'u' The upper triangular part of A is
* supplied in AP.
*
* UPLO = 'L' or 'l' The lower triangular part of A is
* supplied in AP.
*
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the order of the matrix A.
* N must be at least zero.
* Unchanged on exit.
*
* ALPHA - DOUBLE PRECISION.
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* X - DOUBLE PRECISION array of dimension at least
* ( 1 + ( n - 1 )*abs( INCX ) ).
* Before entry, the incremented array X must contain the n
* element vector x.
* Unchanged on exit.
*
* INCX - INTEGER.
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
* Unchanged on exit.
*
* AP - DOUBLE PRECISION array of DIMENSION at least
* ( ( n*( n + 1 ) )/2 ).
* Before entry with UPLO = 'U' or 'u', the array AP must
* contain the upper triangular part of the symmetric matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 )
* and a( 2, 2 ) respectively, and so on. On exit, the array
* AP is overwritten by the upper triangular part of the
* updated matrix.
* Before entry with UPLO = 'L' or 'l', the array AP must
* contain the lower triangular part of the symmetric matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 )
* and a( 3, 1 ) respectively, and so on. On exit, the array
* AP is overwritten by the lower triangular part of the
* updated matrix.
*
*
* Level 2 Blas routine.
*
* -- Written on 22-October-1986.
* Jack Dongarra, Argonne National Lab.
* Jeremy Du Croz, Nag Central Office.
* Sven Hammarling, Nag Central Office.
* Richard Hanson, Sandia National Labs.
*
*
* .. Parameters ..
DOUBLE PRECISION ZERO
PARAMETER ( ZERO = 0.0D+0 )
* .. Local Scalars ..
DOUBLE PRECISION TEMP
INTEGER I, INFO, IX, J, JX, K, KK, KX
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL XERBLA
* ..
* .. Executable Statements ..
*
* Test the input parameters.
*
INFO = 0
IF ( .NOT.LSAME( UPLO, 'U' ).AND.
$ .NOT.LSAME( UPLO, 'L' ) )THEN
INFO = 1
ELSE IF( N.LT.0 )THEN
INFO = 2
ELSE IF( INCX.EQ.0 )THEN
INFO = 5
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'DSPR ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( N.EQ.0 ).OR.( ALPHA.EQ.ZERO ) )
$ RETURN
*
* Set the start point in X if the increment is not unity.
*
IF( INCX.LE.0 )THEN
KX = 1 - ( N - 1 )*INCX
ELSE IF( INCX.NE.1 )THEN
KX = 1
END IF
*
* Start the operations. In this version the elements of the array AP
* are accessed sequentially with one pass through AP.
*
KK = 1
IF( LSAME( UPLO, 'U' ) )THEN
*
* Form A when upper triangle is stored in AP.
*
IF( INCX.EQ.1 )THEN
DO 20, J = 1, N
IF( X( J ).NE.ZERO )THEN
TEMP = ALPHA*X( J )
K = KK
DO 10, I = 1, J
AP( K ) = AP( K ) + X( I )*TEMP
K = K + 1
10 CONTINUE
END IF
KK = KK + J
20 CONTINUE
ELSE
JX = KX
DO 40, J = 1, N
IF( X( JX ).NE.ZERO )THEN
TEMP = ALPHA*X( JX )
IX = KX
DO 30, K = KK, KK + J - 1
AP( K ) = AP( K ) + X( IX )*TEMP
IX = IX + INCX
30 CONTINUE
END IF
JX = JX + INCX
KK = KK + J
40 CONTINUE
END IF
ELSE
*
* Form A when lower triangle is stored in AP.
*
IF( INCX.EQ.1 )THEN
DO 60, J = 1, N
IF( X( J ).NE.ZERO )THEN
TEMP = ALPHA*X( J )
K = KK
DO 50, I = J, N
AP( K ) = AP( K ) + X( I )*TEMP
K = K + 1
50 CONTINUE
END IF
KK = KK + N - J + 1
60 CONTINUE
ELSE
JX = KX
DO 80, J = 1, N
IF( X( JX ).NE.ZERO )THEN
TEMP = ALPHA*X( JX )
IX = JX
DO 70, K = KK, KK + N - J
AP( K ) = AP( K ) + X( IX )*TEMP
IX = IX + INCX
70 CONTINUE
END IF
JX = JX + INCX
KK = KK + N - J + 1
80 CONTINUE
END IF
END IF
*
RETURN
*
* End of DSPR .
*
END
SUBROUTINE ZHPR ( UPLO, N, ALPHA, X, INCX, AP )
* .. Scalar Arguments ..
DOUBLE PRECISION ALPHA
INTEGER INCX, N
CHARACTER*1 UPLO
* .. Array Arguments ..
COMPLEX*16 AP( * ), X( * )
* ..
*
* Purpose
* =======
*
* ZHPR performs the hermitian rank 1 operation
*
* A := alpha*x*conjg( x' ) + A,
*
* where alpha is a real scalar, x is an n element vector and A is an
* n by n hermitian matrix, supplied in packed form.
*
* Parameters
* ==========
*
* UPLO - CHARACTER*1.
* On entry, UPLO specifies whether the upper or lower
* triangular part of the matrix A is supplied in the packed
* array AP as follows:
*
* UPLO = 'U' or 'u' The upper triangular part of A is
* supplied in AP.
*
* UPLO = 'L' or 'l' The lower triangular part of A is
* supplied in AP.
*
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the order of the matrix A.
* N must be at least zero.
* Unchanged on exit.
*
* ALPHA - DOUBLE PRECISION.
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* X - COMPLEX*16 array of dimension at least
* ( 1 + ( n - 1 )*abs( INCX ) ).
* Before entry, the incremented array X must contain the n
* element vector x.
* Unchanged on exit.
*
* INCX - INTEGER.
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
* Unchanged on exit.
*
* AP - COMPLEX*16 array of DIMENSION at least
* ( ( n*( n + 1 ) )/2 ).
* Before entry with UPLO = 'U' or 'u', the array AP must
* contain the upper triangular part of the hermitian matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 )
* and a( 2, 2 ) respectively, and so on. On exit, the array
* AP is overwritten by the upper triangular part of the
* updated matrix.
* Before entry with UPLO = 'L' or 'l', the array AP must
* contain the lower triangular part of the hermitian matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 )
* and a( 3, 1 ) respectively, and so on. On exit, the array
* AP is overwritten by the lower triangular part of the
* updated matrix.
* Note that the imaginary parts of the diagonal elements need
* not be set, they are assumed to be zero, and on exit they
* are set to zero.
*
*
* Level 2 Blas routine.
*
* -- Written on 22-October-1986.
* Jack Dongarra, Argonne National Lab.
* Jeremy Du Croz, Nag Central Office.
* Sven Hammarling, Nag Central Office.
* Richard Hanson, Sandia National Labs.
*
*
* .. Parameters ..
COMPLEX*16 ZERO
PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ) )
* .. Local Scalars ..
COMPLEX*16 TEMP
INTEGER I, INFO, IX, J, JX, K, KK, KX
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL XERBLA
* .. Intrinsic Functions ..
INTRINSIC DCONJG, DBLE
* ..
* .. Executable Statements ..
*
* Test the input parameters.
*
INFO = 0
IF ( .NOT.LSAME( UPLO, 'U' ).AND.
$ .NOT.LSAME( UPLO, 'L' ) )THEN
INFO = 1
ELSE IF( N.LT.0 )THEN
INFO = 2
ELSE IF( INCX.EQ.0 )THEN
INFO = 5
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'ZHPR ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( N.EQ.0 ).OR.( ALPHA.EQ.DBLE( ZERO ) ) )
$ RETURN
*
* Set the start point in X if the increment is not unity.
*
IF( INCX.LE.0 )THEN
KX = 1 - ( N - 1 )*INCX
ELSE IF( INCX.NE.1 )THEN
KX = 1
END IF
*
* Start the operations. In this version the elements of the array AP
* are accessed sequentially with one pass through AP.
*
KK = 1
IF( LSAME( UPLO, 'U' ) )THEN
*
* Form A when upper triangle is stored in AP.
*
IF( INCX.EQ.1 )THEN
DO 20, J = 1, N
IF( X( J ).NE.ZERO )THEN
TEMP = ALPHA*DCONJG( X( J ) )
K = KK
DO 10, I = 1, J - 1
AP( K ) = AP( K ) + X( I )*TEMP
K = K + 1
10 CONTINUE
AP( KK + J - 1 ) = DBLE( AP( KK + J - 1 ) )
$ + DBLE( X( J )*TEMP )
ELSE
AP( KK + J - 1 ) = DBLE( AP( KK + J - 1 ) )
END IF
KK = KK + J
20 CONTINUE
ELSE
JX = KX
DO 40, J = 1, N
IF( X( JX ).NE.ZERO )THEN
TEMP = ALPHA*DCONJG( X( JX ) )
IX = KX
DO 30, K = KK, KK + J - 2
AP( K ) = AP( K ) + X( IX )*TEMP
IX = IX + INCX
30 CONTINUE
AP( KK + J - 1 ) = DBLE( AP( KK + J - 1 ) )
$ + DBLE( X( JX )*TEMP )
ELSE
AP( KK + J - 1 ) = DBLE( AP( KK + J - 1 ) )
END IF
JX = JX + INCX
KK = KK + J
40 CONTINUE
END IF
ELSE
*
* Form A when lower triangle is stored in AP.
*
IF( INCX.EQ.1 )THEN
DO 60, J = 1, N
IF( X( J ).NE.ZERO )THEN
TEMP = ALPHA*DCONJG( X( J ) )
AP( KK ) = DBLE( AP( KK ) ) + DBLE( TEMP*X( J ) )
K = KK + 1
DO 50, I = J + 1, N
AP( K ) = AP( K ) + X( I )*TEMP
K = K + 1
50 CONTINUE
ELSE
AP( KK ) = DBLE( AP( KK ) )
END IF
KK = KK + N - J + 1
60 CONTINUE
ELSE
JX = KX
DO 80, J = 1, N
IF( X( JX ).NE.ZERO )THEN
TEMP = ALPHA*DCONJG( X( JX ) )
AP( KK ) = DBLE( AP( KK ) ) + DBLE( TEMP*X( JX ) )
IX = JX
DO 70, K = KK + 1, KK + N - J
IX = IX + INCX
AP( K ) = AP( K ) + X( IX )*TEMP
70 CONTINUE
ELSE
AP( KK ) = DBLE( AP( KK ) )
END IF
JX = JX + INCX
KK = KK + N - J + 1
80 CONTINUE
END IF
END IF
*
RETURN
*
* End of ZHPR .
*
END
SUBROUTINE ZHPR2 ( UPLO, N, ALPHA, X, INCX, Y, INCY, AP )
* .. Scalar Arguments ..
COMPLEX*16 ALPHA
INTEGER INCX, INCY, N
CHARACTER*1 UPLO
* .. Array Arguments ..
COMPLEX*16 AP( * ), X( * ), Y( * )
* ..
*
* Purpose
* =======
*
* ZHPR2 performs the hermitian rank 2 operation
*
* A := alpha*x*conjg( y' ) + conjg( alpha )*y*conjg( x' ) + A,
*
* where alpha is a scalar, x and y are n element vectors and A is an
* n by n hermitian matrix, supplied in packed form.
*
* Parameters
* ==========
*
* UPLO - CHARACTER*1.
* On entry, UPLO specifies whether the upper or lower
* triangular part of the matrix A is supplied in the packed
* array AP as follows:
*
* UPLO = 'U' or 'u' The upper triangular part of A is
* supplied in AP.
*
* UPLO = 'L' or 'l' The lower triangular part of A is
* supplied in AP.
*
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the order of the matrix A.
* N must be at least zero.
* Unchanged on exit.
*
* ALPHA - COMPLEX*16 .
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* X - COMPLEX*16 array of dimension at least
* ( 1 + ( n - 1 )*abs( INCX ) ).
* Before entry, the incremented array X must contain the n
* element vector x.
* Unchanged on exit.
*
* INCX - INTEGER.
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
* Unchanged on exit.
*
* Y - COMPLEX*16 array of dimension at least
* ( 1 + ( n - 1 )*abs( INCY ) ).
* Before entry, the incremented array Y must contain the n
* element vector y.
* Unchanged on exit.
*
* INCY - INTEGER.
* On entry, INCY specifies the increment for the elements of
* Y. INCY must not be zero.
* Unchanged on exit.
*
* AP - COMPLEX*16 array of DIMENSION at least
* ( ( n*( n + 1 ) )/2 ).
* Before entry with UPLO = 'U' or 'u', the array AP must
* contain the upper triangular part of the hermitian matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 )
* and a( 2, 2 ) respectively, and so on. On exit, the array
* AP is overwritten by the upper triangular part of the
* updated matrix.
* Before entry with UPLO = 'L' or 'l', the array AP must
* contain the lower triangular part of the hermitian matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 )
* and a( 3, 1 ) respectively, and so on. On exit, the array
* AP is overwritten by the lower triangular part of the
* updated matrix.
* Note that the imaginary parts of the diagonal elements need
* not be set, they are assumed to be zero, and on exit they
* are set to zero.
*
*
* Level 2 Blas routine.
*
* -- Written on 22-October-1986.
* Jack Dongarra, Argonne National Lab.
* Jeremy Du Croz, Nag Central Office.
* Sven Hammarling, Nag Central Office.
* Richard Hanson, Sandia National Labs.
*
*
* .. Parameters ..
COMPLEX*16 ZERO
PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ) )
* .. Local Scalars ..
COMPLEX*16 TEMP1, TEMP2
INTEGER I, INFO, IX, IY, J, JX, JY, K, KK, KX, KY
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL XERBLA
* .. Intrinsic Functions ..
INTRINSIC DCONJG, DBLE
* ..
* .. Executable Statements ..
*
* Test the input parameters.
*
INFO = 0
IF ( .NOT.LSAME( UPLO, 'U' ).AND.
$ .NOT.LSAME( UPLO, 'L' ) )THEN
INFO = 1
ELSE IF( N.LT.0 )THEN
INFO = 2
ELSE IF( INCX.EQ.0 )THEN
INFO = 5
ELSE IF( INCY.EQ.0 )THEN
INFO = 7
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'ZHPR2 ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( N.EQ.0 ).OR.( ALPHA.EQ.ZERO ) )
$ RETURN
*
* Set up the start points in X and Y if the increments are not both
* unity.
*
IF( ( INCX.NE.1 ).OR.( INCY.NE.1 ) )THEN
IF( INCX.GT.0 )THEN
KX = 1
ELSE
KX = 1 - ( N - 1 )*INCX
END IF
IF( INCY.GT.0 )THEN
KY = 1
ELSE
KY = 1 - ( N - 1 )*INCY
END IF
JX = KX
JY = KY
END IF
*
* Start the operations. In this version the elements of the array AP
* are accessed sequentially with one pass through AP.
*
KK = 1
IF( LSAME( UPLO, 'U' ) )THEN
*
* Form A when upper triangle is stored in AP.
*
IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN
DO 20, J = 1, N
IF( ( X( J ).NE.ZERO ).OR.( Y( J ).NE.ZERO ) )THEN
TEMP1 = ALPHA*DCONJG( Y( J ) )
TEMP2 = DCONJG( ALPHA*X( J ) )
K = KK
DO 10, I = 1, J - 1
AP( K ) = AP( K ) + X( I )*TEMP1 + Y( I )*TEMP2
K = K + 1
10 CONTINUE
AP( KK + J - 1 ) = DBLE( AP( KK + J - 1 ) ) +
$ DBLE( X( J )*TEMP1 + Y( J )*TEMP2 )
ELSE
AP( KK + J - 1 ) = DBLE( AP( KK + J - 1 ) )
END IF
KK = KK + J
20 CONTINUE
ELSE
DO 40, J = 1, N
IF( ( X( JX ).NE.ZERO ).OR.( Y( JY ).NE.ZERO ) )THEN
TEMP1 = ALPHA*DCONJG( Y( JY ) )
TEMP2 = DCONJG( ALPHA*X( JX ) )
IX = KX
IY = KY
DO 30, K = KK, KK + J - 2
AP( K ) = AP( K ) + X( IX )*TEMP1 + Y( IY )*TEMP2
IX = IX + INCX
IY = IY + INCY
30 CONTINUE
AP( KK + J - 1 ) = DBLE( AP( KK + J - 1 ) ) +
$ DBLE( X( JX )*TEMP1 +
$ Y( JY )*TEMP2 )
ELSE
AP( KK + J - 1 ) = DBLE( AP( KK + J - 1 ) )
END IF
JX = JX + INCX
JY = JY + INCY
KK = KK + J
40 CONTINUE
END IF
ELSE
*
* Form A when lower triangle is stored in AP.
*
IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN
DO 60, J = 1, N
IF( ( X( J ).NE.ZERO ).OR.( Y( J ).NE.ZERO ) )THEN
TEMP1 = ALPHA*DCONJG( Y( J ) )
TEMP2 = DCONJG( ALPHA*X( J ) )
AP( KK ) = DBLE( AP( KK ) ) +
$ DBLE( X( J )*TEMP1 + Y( J )*TEMP2 )
K = KK + 1
DO 50, I = J + 1, N
AP( K ) = AP( K ) + X( I )*TEMP1 + Y( I )*TEMP2
K = K + 1
50 CONTINUE
ELSE
AP( KK ) = DBLE( AP( KK ) )
END IF
KK = KK + N - J + 1
60 CONTINUE
ELSE
DO 80, J = 1, N
IF( ( X( JX ).NE.ZERO ).OR.( Y( JY ).NE.ZERO ) )THEN
TEMP1 = ALPHA*DCONJG( Y( JY ) )
TEMP2 = DCONJG( ALPHA*X( JX ) )
AP( KK ) = DBLE( AP( KK ) ) +
$ DBLE( X( JX )*TEMP1 + Y( JY )*TEMP2 )
IX = JX
IY = JY
DO 70, K = KK + 1, KK + N - J
IX = IX + INCX
IY = IY + INCY
AP( K ) = AP( K ) + X( IX )*TEMP1 + Y( IY )*TEMP2
70 CONTINUE
ELSE
AP( KK ) = DBLE( AP( KK ) )
END IF
JX = JX + INCX
JY = JY + INCY
KK = KK + N - J + 1
80 CONTINUE
END IF
END IF
*
RETURN
*
* End of ZHPR2 .
*
END
SUBROUTINE ZHPMV ( UPLO, N, ALPHA, AP, X, INCX, BETA, Y, INCY )
* .. Scalar Arguments ..
COMPLEX*16 ALPHA, BETA
INTEGER INCX, INCY, N
CHARACTER*1 UPLO
* .. Array Arguments ..
COMPLEX*16 AP( * ), X( * ), Y( * )
* ..
*
* Purpose
* =======
*
* ZHPMV performs the matrix-vector operation
*
* y := alpha*A*x + beta*y,
*
* where alpha and beta are scalars, x and y are n element vectors and
* A is an n by n hermitian matrix, supplied in packed form.
*
* Parameters
* ==========
*
* UPLO - CHARACTER*1.
* On entry, UPLO specifies whether the upper or lower
* triangular part of the matrix A is supplied in the packed
* array AP as follows:
*
* UPLO = 'U' or 'u' The upper triangular part of A is
* supplied in AP.
*
* UPLO = 'L' or 'l' The lower triangular part of A is
* supplied in AP.
*
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the order of the matrix A.
* N must be at least zero.
* Unchanged on exit.
*
* ALPHA - COMPLEX*16 .
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* AP - COMPLEX*16 array of DIMENSION at least
* ( ( n*( n + 1 ) )/2 ).
* Before entry with UPLO = 'U' or 'u', the array AP must
* contain the upper triangular part of the hermitian matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 )
* and a( 2, 2 ) respectively, and so on.
* Before entry with UPLO = 'L' or 'l', the array AP must
* contain the lower triangular part of the hermitian matrix
* packed sequentially, column by column, so that AP( 1 )
* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 )
* and a( 3, 1 ) respectively, and so on.
* Note that the imaginary parts of the diagonal elements need
* not be set and are assumed to be zero.
* Unchanged on exit.
*
* X - COMPLEX*16 array of dimension at least
* ( 1 + ( n - 1 )*abs( INCX ) ).
* Before entry, the incremented array X must contain the n
* element vector x.
* Unchanged on exit.
*
* INCX - INTEGER.
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
* Unchanged on exit.
*
* BETA - COMPLEX*16 .
* On entry, BETA specifies the scalar beta. When BETA is
* supplied as zero then Y need not be set on input.
* Unchanged on exit.
*
* Y - COMPLEX*16 array of dimension at least
* ( 1 + ( n - 1 )*abs( INCY ) ).
* Before entry, the incremented array Y must contain the n
* element vector y. On exit, Y is overwritten by the updated
* vector y.
*
* INCY - INTEGER.
* On entry, INCY specifies the increment for the elements of
* Y. INCY must not be zero.
* Unchanged on exit.
*
*
* Level 2 Blas routine.
*
* -- Written on 22-October-1986.
* Jack Dongarra, Argonne National Lab.
* Jeremy Du Croz, Nag Central Office.
* Sven Hammarling, Nag Central Office.
* Richard Hanson, Sandia National Labs.
*
*
* .. Parameters ..
COMPLEX*16 ONE
PARAMETER ( ONE = ( 1.0D+0, 0.0D+0 ) )
COMPLEX*16 ZERO
PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ) )
* .. Local Scalars ..
COMPLEX*16 TEMP1, TEMP2
INTEGER I, INFO, IX, IY, J, JX, JY, K, KK, KX, KY
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL XERBLA
* .. Intrinsic Functions ..
INTRINSIC DCONJG, DBLE
* ..
* .. Executable Statements ..
*
* Test the input parameters.
*
INFO = 0
IF ( .NOT.LSAME( UPLO, 'U' ).AND.
$ .NOT.LSAME( UPLO, 'L' ) )THEN
INFO = 1
ELSE IF( N.LT.0 )THEN
INFO = 2
ELSE IF( INCX.EQ.0 )THEN
INFO = 6
ELSE IF( INCY.EQ.0 )THEN
INFO = 9
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'ZHPMV ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( N.EQ.0 ).OR.( ( ALPHA.EQ.ZERO ).AND.( BETA.EQ.ONE ) ) )
$ RETURN
*
* Set up the start points in X and Y.
*
IF( INCX.GT.0 )THEN
KX = 1
ELSE
KX = 1 - ( N - 1 )*INCX
END IF
IF( INCY.GT.0 )THEN
KY = 1
ELSE
KY = 1 - ( N - 1 )*INCY
END IF
*
* Start the operations. In this version the elements of the array AP
* are accessed sequentially with one pass through AP.
*
* First form y := beta*y.
*
IF( BETA.NE.ONE )THEN
IF( INCY.EQ.1 )THEN
IF( BETA.EQ.ZERO )THEN
DO 10, I = 1, N
Y( I ) = ZERO
10 CONTINUE
ELSE
DO 20, I = 1, N
Y( I ) = BETA*Y( I )
20 CONTINUE
END IF
ELSE
IY = KY
IF( BETA.EQ.ZERO )THEN
DO 30, I = 1, N
Y( IY ) = ZERO
IY = IY + INCY
30 CONTINUE
ELSE
DO 40, I = 1, N
Y( IY ) = BETA*Y( IY )
IY = IY + INCY
40 CONTINUE
END IF
END IF
END IF
IF( ALPHA.EQ.ZERO )
$ RETURN
KK = 1
IF( LSAME( UPLO, 'U' ) )THEN
*
* Form y when AP contains the upper triangle.
*
IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN
DO 60, J = 1, N
TEMP1 = ALPHA*X( J )
TEMP2 = ZERO
K = KK
DO 50, I = 1, J - 1
Y( I ) = Y( I ) + TEMP1*AP( K )
TEMP2 = TEMP2 + DCONJG( AP( K ) )*X( I )
K = K + 1
50 CONTINUE
Y( J ) = Y( J ) + TEMP1*DBLE( AP( KK + J - 1 ) )
$ + ALPHA*TEMP2
KK = KK + J
60 CONTINUE
ELSE
JX = KX
JY = KY
DO 80, J = 1, N
TEMP1 = ALPHA*X( JX )
TEMP2 = ZERO
IX = KX
IY = KY
DO 70, K = KK, KK + J - 2
Y( IY ) = Y( IY ) + TEMP1*AP( K )
TEMP2 = TEMP2 + DCONJG( AP( K ) )*X( IX )
IX = IX + INCX
IY = IY + INCY
70 CONTINUE
Y( JY ) = Y( JY ) + TEMP1*DBLE( AP( KK + J - 1 ) )
$ + ALPHA*TEMP2
JX = JX + INCX
JY = JY + INCY
KK = KK + J
80 CONTINUE
END IF
ELSE
*
* Form y when AP contains the lower triangle.
*
IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN
DO 100, J = 1, N
TEMP1 = ALPHA*X( J )
TEMP2 = ZERO
Y( J ) = Y( J ) + TEMP1*DBLE( AP( KK ) )
K = KK + 1
DO 90, I = J + 1, N
Y( I ) = Y( I ) + TEMP1*AP( K )
TEMP2 = TEMP2 + DCONJG( AP( K ) )*X( I )
K = K + 1
90 CONTINUE
Y( J ) = Y( J ) + ALPHA*TEMP2
KK = KK + ( N - J + 1 )
100 CONTINUE
ELSE
JX = KX
JY = KY
DO 120, J = 1, N
TEMP1 = ALPHA*X( JX )
TEMP2 = ZERO
Y( JY ) = Y( JY ) + TEMP1*DBLE( AP( KK ) )
IX = JX
IY = JY
DO 110, K = KK + 1, KK + N - J
IX = IX + INCX
IY = IY + INCY
Y( IY ) = Y( IY ) + TEMP1*AP( K )
TEMP2 = TEMP2 + DCONJG( AP( K ) )*X( IX )
110 CONTINUE
Y( JY ) = Y( JY ) + ALPHA*TEMP2
JX = JX + INCX
JY = JY + INCY
KK = KK + ( N - J + 1 )
120 CONTINUE
END IF
END IF
*
RETURN
*
* End of ZHPMV .
*
END
SUBROUTINE ZGERC ( M, N, ALPHA, X, INCX, Y, INCY, A, LDA )
* .. Scalar Arguments ..
COMPLEX*16 ALPHA
INTEGER INCX, INCY, LDA, M, N
* .. Array Arguments ..
COMPLEX*16 A( LDA, * ), X( * ), Y( * )
* ..
*
* Purpose
* =======
*
* ZGERC performs the rank 1 operation
*
* A := alpha*x*conjg( y' ) + A,
*
* where alpha is a scalar, x is an m element vector, y is an n element
* vector and A is an m by n matrix.
*
* Parameters
* ==========
*
* M - INTEGER.
* On entry, M specifies the number of rows of the matrix A.
* M must be at least zero.
* Unchanged on exit.
*
* N - INTEGER.
* On entry, N specifies the number of columns of the matrix A.
* N must be at least zero.
* Unchanged on exit.
*
* ALPHA - COMPLEX*16 .
* On entry, ALPHA specifies the scalar alpha.
* Unchanged on exit.
*
* X - COMPLEX*16 array of dimension at least
* ( 1 + ( m - 1 )*abs( INCX ) ).
* Before entry, the incremented array X must contain the m
* element vector x.
* Unchanged on exit.
*
* INCX - INTEGER.
* On entry, INCX specifies the increment for the elements of
* X. INCX must not be zero.
* Unchanged on exit.
*
* Y - COMPLEX*16 array of dimension at least
* ( 1 + ( n - 1 )*abs( INCY ) ).
* Before entry, the incremented array Y must contain the n
* element vector y.
* Unchanged on exit.
*
* INCY - INTEGER.
* On entry, INCY specifies the increment for the elements of
* Y. INCY must not be zero.
* Unchanged on exit.
*
* A - COMPLEX*16 array of DIMENSION ( LDA, n ).
* Before entry, the leading m by n part of the array A must
* contain the matrix of coefficients. On exit, A is
* overwritten by the updated matrix.
*
* LDA - INTEGER.
* On entry, LDA specifies the first dimension of A as declared
* in the calling (sub) program. LDA must be at least
* max( 1, m ).
* Unchanged on exit.
*
*
* Level 2 Blas routine.
*
* -- Written on 22-October-1986.
* Jack Dongarra, Argonne National Lab.
* Jeremy Du Croz, Nag Central Office.
* Sven Hammarling, Nag Central Office.
* Richard Hanson, Sandia National Labs.
*
*
* .. Parameters ..
COMPLEX*16 ZERO
PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ) )
* .. Local Scalars ..
COMPLEX*16 TEMP
INTEGER I, INFO, IX, J, JY, KX
* .. External Subroutines ..
EXTERNAL XERBLA
* .. Intrinsic Functions ..
INTRINSIC DCONJG, MAX
* ..
* .. Executable Statements ..
*
* Test the input parameters.
*
INFO = 0
IF ( M.LT.0 )THEN
INFO = 1
ELSE IF( N.LT.0 )THEN
INFO = 2
ELSE IF( INCX.EQ.0 )THEN
INFO = 5
ELSE IF( INCY.EQ.0 )THEN
INFO = 7
ELSE IF( LDA.LT.MAX( 1, M ) )THEN
INFO = 9
END IF
IF( INFO.NE.0 )THEN
CALL XERBLA( 'ZGERC ', INFO )
RETURN
END IF
*
* Quick return if possible.
*
IF( ( M.EQ.0 ).OR.( N.EQ.0 ).OR.( ALPHA.EQ.ZERO ) )
$ RETURN
*
* Start the operations. In this version the elements of A are
* accessed sequentially with one pass through A.
*
IF( INCY.GT.0 )THEN
JY = 1
ELSE
JY = 1 - ( N - 1 )*INCY
END IF
IF( INCX.EQ.1 )THEN
DO 20, J = 1, N
IF( Y( JY ).NE.ZERO )THEN
TEMP = ALPHA*DCONJG( Y( JY ) )
DO 10, I = 1, M
A( I, J ) = A( I, J ) + X( I )*TEMP
10 CONTINUE
END IF
JY = JY + INCY
20 CONTINUE
ELSE
IF( INCX.GT.0 )THEN
KX = 1
ELSE
KX = 1 - ( M - 1 )*INCX
END IF
DO 40, J = 1, N
IF( Y( JY ).NE.ZERO )THEN
TEMP = ALPHA*DCONJG( Y( JY ) )
IX = KX
DO 30, I = 1, M
A( I, J ) = A( I, J ) + X( IX )*TEMP
IX = IX + INCX
30 CONTINUE
END IF
JY = JY + INCY
40 CONTINUE
END IF
*
RETURN
*
* End of ZGERC .
*
END
subroutine drotg(da,db,c,s)
c
c construct givens plane rotation.
c jack dongarra, linpack, 3/11/78.
c
double precision da,db,c,s,roe,scale,r,z
c
roe = db
if( dabs(da) .gt. dabs(db) ) roe = da
scale = dabs(da) + dabs(db)
if( scale .ne. 0.0d0 ) go to 10
c = 1.0d0
s = 0.0d0
r = 0.0d0
z = 0.0d0
go to 20
10 r = scale*dsqrt((da/scale)**2 + (db/scale)**2)
r = dsign(1.0d0,roe)*r
c = da/r
s = db/r
z = 1.0d0
if( dabs(da) .gt. dabs(db) ) z = s
if( dabs(db) .ge. dabs(da) .and. c .ne. 0.0d0 ) z = 1.0d0/c
20 da = r
db = z
return
end
subroutine drot (n,dx,incx,dy,incy,c,s)
c
c applies a plane rotation.
c jack dongarra, linpack, 3/11/78.
c modified 12/3/93, array(1) declarations changed to array(*)
c
double precision dx(*),dy(*),dtemp,c,s
integer i,incx,incy,ix,iy,n
c
if(n.le.0)return
if(incx.eq.1.and.incy.eq.1)go to 20
c
c code for unequal increments or equal increments not equal
c to 1
c
ix = 1
iy = 1
if(incx.lt.0)ix = (-n+1)*incx + 1
if(incy.lt.0)iy = (-n+1)*incy + 1
do 10 i = 1,n
dtemp = c*dx(ix) + s*dy(iy)
dy(iy) = c*dy(iy) - s*dx(ix)
dx(ix) = dtemp
ix = ix + incx
iy = iy + incy
10 continue
return
c
c code for both increments equal to 1
c
20 do 30 i = 1,n
dtemp = c*dx(i) + s*dy(i)
dy(i) = c*dy(i) - s*dx(i)
dx(i) = dtemp
30 continue
return
end