mirror of https://gitlab.com/QEF/q-e.git
54 lines
1.5 KiB
Fortran
54 lines
1.5 KiB
Fortran
INTEGER FUNCTION INDXG2L( INDXGLOB, NB, IPROC, ISRCPROC, NPROCS )
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*
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* -- ScaLAPACK tools routine (version 1.5) --
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* University of Tennessee, Knoxville, Oak Ridge National Laboratory,
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* and University of California, Berkeley.
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* May 1, 1997
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*
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* .. Scalar Arguments ..
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INTEGER INDXGLOB, IPROC, ISRCPROC, NB, NPROCS
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* ..
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*
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* Purpose
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* =======
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*
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* INDXG2L computes the local index of a distributed matrix entry
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* pointed to by the global index INDXGLOB.
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*
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* Arguments
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* =========
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*
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* INDXGLOB (global input) INTEGER
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* The global index of the distributed matrix entry.
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*
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* NB (global input) INTEGER
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* Block size, size of the blocks the distributed matrix is
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* split into.
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*
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* IPROC (local dummy) INTEGER
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* Dummy argument in this case in order to unify the calling
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* sequence of the tool-routines.
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*
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* ISRCPROC (local dummy) INTEGER
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* Dummy argument in this case in order to unify the calling
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* sequence of the tool-routines.
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*
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* NPROCS (global input) INTEGER
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* The total number processes over which the distributed
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* matrix is distributed.
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*
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* =====================================================================
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*
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* .. Intrinsic Functions ..
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INTRINSIC MOD
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* ..
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* .. Executable Statements ..
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*
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INDXG2L = NB*((INDXGLOB-1)/(NB*NPROCS))+MOD(INDXGLOB-1,NB)+1
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*
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RETURN
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*
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* End of INDXG2L
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*
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END
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