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quantum-espresso/GWW/head/phq_readin.f90

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!
! Copyright (C) 2001-2016 Quantum ESPRESSO group
! This file is distributed under the terms of the
! GNU General Public License. See the file `License'
! in the root directory of the present distribution,
! or http://www.gnu.org/copyleft/gpl.txt .
!
!
!
!
!----------------------------------------------------------------------------
SUBROUTINE phq_readin()
!----------------------------------------------------------------------------
!
! This routine reads the control variables for the program phononq.
! from standard input (unit 5).
! A second routine readfile reads the variables saved on a file
! by the self-consistent program.
!
!
USE kinds, ONLY : DP
USE ions_base, ONLY : nat, ntyp => nsp
USE io_global, ONLY : ionode_id
USE mp, ONLY : mp_bcast,mp_barrier
USE mp_world, ONLY : world_comm
USE ions_base, ONLY : amass, atm
USE check_stop, ONLY : max_seconds
USE start_k, ONLY : reset_grid, nk1, nk2, nk3, k1, k2, k3
USE klist, ONLY : xk, nks, nkstot, lgauss, two_fermi_energies, ltetra
USE control_flags, ONLY : gamma_only, tqr, restart
USE uspp, ONLY : okvan
USE fixed_occ, ONLY : tfixed_occ
USE lsda_mod, ONLY : lsda, nspin
USE spin_orb, ONLY : domag
USE cellmd, ONLY : lmovecell
USE run_info, ONLY : title
USE control_ph, ONLY : maxter, alpha_mix, lgamma_gamma, epsil, &
zue, zeu, xmldyn, newgrid, &
trans, reduce_io, tr2_ph, niter_ph, &
nmix_ph, ldisp, recover, lnoloc, start_irr, &
last_irr, start_q, last_q, current_iq, tmp_dir_ph, &
ext_recover, ext_restart, u_from_file, ldiag, &
search_sym, lqdir, electron_phonon
USE save_ph, ONLY : tmp_dir_save
USE gamma_gamma, ONLY : asr
USE partial, ONLY : atomo, nat_todo, nat_todo_input
USE output, ONLY : fildyn, fildvscf, fildrho
USE disp, ONLY : nq1, nq2, nq3
USE io_files, ONLY : tmp_dir, prefix, create_directory
USE noncollin_module, ONLY : i_cons, noncolin
USE ldaU, ONLY : lda_plus_u
USE control_flags, ONLY : iverbosity, modenum, io_level
USE io_global, ONLY : ionode, stdout
USE mp_global, ONLY : nproc_pool_file, nproc_image_file, &
ntask_groups_file, nproc_bgrp_file
USE mp_images, ONLY : nimage, my_image_id, nproc_image
USE mp_pools, ONLY : nproc_pool, npool
USE mp_bands, ONLY : ntask_groups
USE paw_variables, ONLY : okpaw
USE ramanm, ONLY : eth_rps, eth_ns, lraman, elop, dek
USE freq_ph, ONLY : fpol, fiu, nfs
USE ph_restart, ONLY : ph_readfile
USE el_phon, ONLY : elph,elph_mat,elph_simple,elph_nbnd_min, elph_nbnd_max, &
el_ph_sigma, el_ph_nsigma, el_ph_ngauss,auxdvscf
USE dfile_star, ONLY : drho_star, dvscf_star
USE wannier_gw, ONLY : l_head, omega_gauss, n_gauss, grid_type, nsteps_lanczos,second_grid_n,second_grid_i,&
&l_scissor,scissor, len_head_block_freq, len_head_block_wfc
USE save_ph, ONLY : save_ph_input_variables
USE qpoint, ONLY : nksq, xq
USE control_lr, ONLY : lgamma, lrpa
!
IMPLICIT NONE
!
CHARACTER(LEN=256), EXTERNAL :: trimcheck
!
INTEGER :: ios, ipol, iter, na, it, ierr
! integer variable for I/O control
! counter on polarizations
! counter on iterations
! counter on atoms
! counter on types
REAL(DP), ALLOCATABLE :: amass_input(:)
! save masses read from input here
CHARACTER (LEN=256) :: outdir
!
CHARACTER(LEN=80) :: card
CHARACTER(LEN=6) :: int_to_char
INTEGER :: i
LOGICAL :: nogg
INTEGER, EXTERNAL :: atomic_number
REAL(DP), EXTERNAL :: atom_weight
LOGICAL, EXTERNAL :: imatches
LOGICAL, EXTERNAL :: has_xml
!
NAMELIST / INPUTPH / tr2_ph, amass, alpha_mix, niter_ph, nmix_ph, &
nat_todo, iverbosity, outdir, epsil, &
trans, zue, zeu, max_seconds, reduce_io, &
modenum, prefix, fildyn, fildvscf, fildrho, &
ldisp, nq1, nq2, nq3, &
eth_rps, eth_ns, lraman, elop, dek, recover, &
fpol, asr, lrpa, lnoloc, start_irr, last_irr, &
start_q, last_q, nogg, ldiag, search_sym, lqdir, &
nk1, nk2, nk3, k1, k2, k3, &
drho_star, dvscf_star, &
elph_nbnd_min, elph_nbnd_max, el_ph_ngauss,el_ph_nsigma, el_ph_sigma, &
electron_phonon,&
l_head, omega_gauss, n_gauss, grid_type,nsteps_lanczos,l_scissor,scissor,&
second_grid_n,second_grid_i,len_head_block_wfc,len_head_block_freq
! tr2_ph : convergence threshold
! amass : atomic masses
! alpha_mix : the mixing parameter
! niter_ph : maximum number of iterations
! nmix_ph : number of previous iterations used in mixing
! nat_todo : number of atom to be displaced
! iverbosity : verbosity control
! outdir : directory where input, output, temporary files reside
! epsil : if true calculate dielectric constant
! trans : if true calculate phonon
! electron-phonon : select the kind of electron-phonon calculation
! elph : if true calculate electron-phonon coefficients
! elph_mat : if true eph coefficients for wannier
! zue : if .true. calculate effective charges ( d force / dE )
! zeu : if .true. calculate effective charges ( d P / du )
! lraman : if true calculate raman tensor
! elop : if true calculate electro-optic tensor
! max_seconds : maximum cputime for this run
! reduce_io : reduce I/O to the strict minimum
! modenum : single mode calculation
! prefix : the prefix of files produced by pwscf
! fildyn : output file for the dynamical matrix
! fildvscf : output file containing deltavsc
! fildrho : output file containing deltarho
! fildrho_dir : directory where fildrho files will be stored (default: outdir or ESPRESSO_FILDRHO_DIR variable)
! eth_rps : threshold for calculation of Pc R |psi> (Raman)
! eth_ns : threshold for non-scf wavefunction calculation (Raman)
! dek : delta_xk used for wavefunctions derivation (Raman)
! recover : recover=.true. to restart from an interrupted run
! asr : in the gamma_gamma case apply acoustic sum rule
! start_q : in q list does the q points from start_q to last_q
! last_q :
! start_irr : does the irred. representation from start_irr to last_irr
! last_irr :
! nogg : if .true. lgamma_gamma tricks are not used
! ldiag : if .true. force diagonalization of the dyn mat
! lqdir : if .true. each q writes in its own directory
! search_sym : if .true. analyze symmetry if possible
! nk1,nk2,nk3,
! ik1, ik2, ik3: when specified in input it uses for the phonon run
! a different mesh than that used for the charge density.
!
! dvscf_star%open : if .true. write in dvscf_star%dir the dvscf_q' for all q' in the
! star of q with suffix dvscf_star%ext. The dvscf_q' is written in the basis dvscf_star%basis;
! if dvscf_star%pat is .true. also save a pattern file.
! dvscf_star%dir, dvscf_star%ext, dvscf_star%basis : see dvscf_star%open
! drho_star%open : like dvscf_star%open but for drho_q
! drho_star%dir, drho_star%ext, drho_star%basis : see drho_star%open
!
! elph_nbnd_min,
! elph_nbnd_max: if (elph_mat=.true.) it dumps the eph matrix element from elph_nbnd_min
! to elph_nbnd_max
! el_ph_ngauss,
! el_ph_nsigma,
! el_ph_sigma : if (elph_mat=.true.) it defines the kind and the val-ue of the
! smearing to be used in the eph coupling calculation.
!
! l_head : if true calculates the head of the symmetrized dielectric matrix -1
! n_gauss : number of frequency steps for head calculation
! omega_gauss : period for frequency calculation
! grid_type : 0 GL -T,T 2 GL 0 T
IF (ionode) THEN
!
! ... Input from file ?
!
CALL input_from_file ( )
!
! ... Read the first line of the input file
!
READ( 5, '(A)', IOSTAT = ios ) title
!
ENDIF
!
CALL mp_bcast(ios, ionode_id, world_comm )
CALL errore( 'phq_readin', 'reading title ', ABS( ios ) )
CALL mp_bcast(title, ionode_id, world_comm )
!
! Rewind the input if the title is actually the beginning of inputph namelist
!
IF( imatches("&inputph", title) ) THEN
WRITE(*, '(6x,a)') "Title line not specified: using 'default'."
title='default'
IF (ionode) REWIND(5, iostat=ios)
CALL mp_bcast(ios, ionode_id, world_comm )
CALL errore('phq_readin', 'Title line missing from input.', abs(ios))
ENDIF
!
! ... set default values for variables in namelist
!
tr2_ph = 1.D-12
eth_rps = 1.D-9
eth_ns = 1.D-12
amass(:) = 0.D0
alpha_mix(:) = 0.D0
alpha_mix(1) = 0.7D0
niter_ph = maxter
nmix_ph = 4
nat_todo = 0
modenum = 0
iverbosity = 0
trans = .TRUE.
lrpa = .FALSE.
lnoloc = .FALSE.
epsil = .FALSE.
zeu = .TRUE.
zue = .FALSE.
fpol = .FALSE.
electron_phonon=' '
elph_nbnd_min = 1
elph_nbnd_max = 0
el_ph_sigma = 0.02
el_ph_nsigma = 30
el_ph_ngauss = 1
lraman = .FALSE.
elop = .FALSE.
max_seconds = 1.E+7_DP
reduce_io = .FALSE.
CALL get_environment_variable( 'ESPRESSO_TMPDIR', outdir )
IF ( TRIM( outdir ) == ' ' ) outdir = './'
prefix = 'pwscf'
fildyn = 'matdyn'
fildrho = ' '
fildvscf = ' '
ldisp = .FALSE.
nq1 = 0
nq2 = 0
nq3 = 0
dek = 1.0d-3
nogg = .FALSE.
recover = .FALSE.
asr = .FALSE.
start_irr = 0
last_irr = -1000
start_q = 1
last_q =-1000
ldiag =.FALSE.
lqdir =.FALSE.
search_sym =.TRUE.
nk1 = 0
nk2 = 0
nk3 = 0
k1 = 0
k2 = 0
k3 = 0
len_head_block_freq=0
len_head_block_wfc=0
!
drho_star%open = .FALSE.
drho_star%basis = 'modes'
drho_star%pat = .TRUE.
drho_star%ext = 'drho'
CALL get_environment_variable( 'ESPRESSO_FILDRHO_DIR', drho_star%dir)
IF ( TRIM( drho_star%dir ) == ' ' ) &
drho_star%dir = TRIM(outdir)//"/Rotated_DRHO/"
!
dvscf_star%open = .FALSE.
dvscf_star%basis = 'modes'
dvscf_star%pat = .FALSE.
dvscf_star%ext = 'dvscf'
CALL get_environment_variable( 'ESPRESSO_FILDVSCF_DIR', dvscf_star%dir)
IF ( TRIM( dvscf_star%dir ) == ' ' ) &
dvscf_star%dir = TRIM(outdir)//"/Rotated_DVSCF/"
!
! ... reading the namelist inputph
!
IF (ionode) READ( 5, INPUTPH, IOSTAT = ios )
!
CALL mp_bcast(ios, ionode_id, world_comm)
CALL errore( 'phq_readin', 'reading inputph namelist', ABS( ios ) )
!
IF (ionode) tmp_dir = trimcheck (outdir)
drho_star%dir=trimcheck(drho_star%dir)
dvscf_star%dir=trimcheck(dvscf_star%dir)
! filename for the star must always be automatically generated:
IF(drho_star%ext(1:5)/='auto:') drho_star%ext = 'auto:'//drho_star%ext
IF(dvscf_star%ext(1:5)/='auto:') dvscf_star%ext = 'auto:'//dvscf_star%ext
CALL bcast_ph_input ( )
CALL mp_bcast(nogg, ionode_id, world_comm )
!
! ... Check all namelist variables
!
IF (tr2_ph <= 0.D0) CALL errore (' phq_readin', ' Wrong tr2_ph ', 1)
IF (eth_rps<= 0.D0) CALL errore ( 'phq_readin', ' Wrong eth_rps', 1)
IF (eth_ns <= 0.D0) CALL errore ( 'phq_readin', ' Wrong eth_ns ', 1)
DO iter = 1, maxter
IF (alpha_mix (iter) .LT.0.D0.OR.alpha_mix (iter) .GT.1.D0) CALL &
errore ('phq_readin', ' Wrong alpha_mix ', iter)
ENDDO
IF (niter_ph.LT.1.OR.niter_ph.GT.maxter) CALL errore ('phq_readin', &
' Wrong niter_ph ', 1)
IF (nmix_ph.LT.1.OR.nmix_ph.GT.5) CALL errore ('phq_readin', ' Wrong &
&nmix_ph ', 1)
IF (iverbosity.NE.0.AND.iverbosity.NE.1) CALL errore ('phq_readin', &
&' Wrong iverbosity ', 1)
IF (fildyn.EQ.' ') CALL errore ('phq_readin', ' Wrong fildyn ', 1)
IF (max_seconds.LT.0.1D0) CALL errore ('phq_readin', ' Wrong max_seconds', 1)
IF (modenum < 0) CALL errore ('phq_readin', ' Wrong modenum ', 1)
IF (dek <= 0.d0) CALL errore ( 'phq_readin', ' Wrong dek ', 1)
!
SELECT CASE( trim( electron_phonon ) )
CASE( 'simple' )
elph=.true.
elph_mat=.false.
elph_simple=.true.
CASE( 'Wannier' )
elph=.true.
elph_mat=.true.
elph_simple=.false.
auxdvscf=trim(fildvscf)
CASE( 'interpolated' )
elph=.true.
elph_mat=.false.
elph_simple=.false.
CASE DEFAULT
elph=.false.
elph_mat=.false.
elph_simple=.false.
END SELECT
epsil = epsil .OR. lraman .OR. elop
IF (modenum /= 0) search_sym=.FALSE.
if(elph_simple.or.elph_mat) then
trans=.false.
else
trans = trans .OR. ldisp
endif
!
! Set default value for fildrho and fildvscf if they are required
IF ( (lraman.OR.elop.OR.drho_star%open) .AND. fildrho == ' ') fildrho = 'drho'
IF ( (elph_mat.OR.dvscf_star%open) .AND. fildvscf == ' ') fildvscf = 'dvscf'
!
! We can calculate dielectric, raman or elop tensors and no Born effective
! charges dF/dE, but we cannot calculate Born effective charges dF/dE
! without epsil.
!
IF (zeu) zeu = epsil
!
! reads the q point (just if ldisp = .false.)
!
IF (ionode) THEN
IF (.NOT. ldisp) &
READ (5, *, iostat = ios) (xq (ipol), ipol = 1, 3)
END IF
CALL mp_bcast(ios, ionode_id, world_comm)
CALL errore ('phq_readin', 'reading xq', ABS (ios) )
CALL mp_bcast(xq, ionode_id, world_comm )
IF (.NOT.ldisp) THEN
lgamma = xq (1) .EQ.0.D0.AND.xq (2) .EQ.0.D0.AND.xq (3) .EQ.0.D0
IF ( (epsil.OR.zue) .AND..NOT.lgamma) CALL errore ('phq_readin', &
'gamma is needed for elec.field', 1)
ENDIF
IF (zue.AND..NOT.trans) CALL errore ('phq_readin', 'trans must be &
&.t. for Zue calc.', 1)
IF (trans.AND.(lrpa.OR.lnoloc)) CALL errore('phq_readin', &
'only dielectric constant with lrpa or lnoloc',1)
IF (lrpa.or.lnoloc) THEN
zeu=.FALSE.
lraman=.FALSE.
elop = .FALSE.
ENDIF
!
! reads the frequencies ( just if fpol = .true. )
!
IF ( fpol ) THEN
nfs=0
IF (ionode) THEN
READ (5, *, iostat = ios) card
IF ( TRIM(card)=='FREQUENCIES'.OR. &
TRIM(card)=='frequencies'.OR. &
TRIM(card)=='Frequencies') THEN
READ (5, *, iostat = ios) nfs
ENDIF
ENDIF
CALL mp_bcast(ios, ionode_id, world_comm )
CALL errore ('phq_readin', 'reading number of FREQUENCIES', ABS(ios) )
CALL mp_bcast(nfs, ionode_id, world_comm )
if (nfs < 1) call errore('phq_readin','Too few frequencies',1)
ALLOCATE(fiu(nfs))
IF (ionode) THEN
IF ( TRIM(card) == 'FREQUENCIES' .OR. &
TRIM(card) == 'frequencies' .OR. &
TRIM(card) == 'Frequencies' ) THEN
DO i = 1, nfs
READ (5, *, iostat = ios) fiu(i)
END DO
END IF
END IF
CALL mp_bcast(ios, ionode_id, world_comm)
CALL errore ('phq_readin', 'reading FREQUENCIES card', ABS(ios) )
CALL mp_bcast(fiu, ionode_id, world_comm )
ELSE
nfs=1
ALLOCATE(fiu(1))
fiu=0.0_DP
END IF
!
!
! Here we finished the reading of the input file.
! Now allocate space for pwscf variables, read and check them.
!
! amass will also be read from file:
! save its content in auxiliary variables
!
ALLOCATE ( amass_input( SIZE(amass) ) )
amass_input(:)= amass(:)
!
tmp_dir_save=tmp_dir
tmp_dir_ph= TRIM (tmp_dir) // '_ph' // TRIM(int_to_char(my_image_id)) //'/'
CALL create_directory(tmp_dir_ph)
ext_restart=.FALSE.
ext_recover=.FALSE.
IF (recover) THEN
CALL ph_readfile('init',0,0,ierr)
IF (ierr /= 0 ) THEN
recover=.FALSE.
goto 1001
ENDIF
tmp_dir=tmp_dir_ph
CALL check_restart_recover(ext_recover, ext_restart)
tmp_dir=tmp_dir_save
IF (ldisp) lgamma = (current_iq==1)
!
! If there is a restart or a recover file ph.x has saved its own data-file
! and we read the initial information from that file
!
IF ((ext_recover.OR.ext_restart).AND..NOT.lgamma) &
tmp_dir=tmp_dir_ph
u_from_file=.true.
ENDIF
1001 CONTINUE
CALL read_file ( )
!
! init_start_grid returns .true. if a new k-point grid is set from values
! read from input (this happens if nk1*nk2*nk3, else it returns .false.,
! leaves the current values, as read in read_file, unchanged)
!
newgrid = reset_grid (nk1, nk2, nk3, k1, k2, k3)
!
tmp_dir=tmp_dir_save
!
IF (modenum > 3*nat) CALL errore ('phq_readin', ' Wrong modenum ', 2)
IF (gamma_only) CALL errore('phq_readin',&
'cannot start from pw.x data file using Gamma-point tricks',1)
IF (lda_plus_u) CALL errore('phq_readin',&
'The phonon code with LDA+U is not yet available',1)
IF (okpaw.and.(lraman.or.elop)) CALL errore('phq_readin',&
'The phonon code with paw and raman or elop is not yet available',1)
IF (okpaw.and.noncolin.and.domag) CALL errore('phq_readin',&
'The phonon code with paw and domag is not available yet',1)
IF (okvan.and.(lraman.or.elop)) CALL errore('phq_readin',&
'The phonon code with US-PP and raman or elop not yet available',1)
IF (noncolin.and.(lraman.or.elop)) CALL errore('phq_readin', &
'lraman, elop, and noncolin not programed',1)
IF (lmovecell) CALL errore('phq_readin', &
'The phonon code is not working after vc-relax',1)
IF (ntask_groups > 1) &
CALL errore('phq_readin','task_groups not available in phonon',1)
IF (nproc_bgrp_file /= nproc_pool_file) &
CALL errore('phq_readin','band parallelization not available in phonon',1)
IF (elph.and.nimage>1) CALL errore('phq_readin',&
'el-ph with image parallelization is not yet available',1)
if(elph_mat.and.fildvscf.eq.' ') call errore('phq_readin',&
'el-ph with wannier requires fildvscf',1)
IF(elph_mat.and.npool.ne.1) call errore('phq_readin',&
'el-ph with wannier : pools not implemented',1)
IF (elph.OR.fildvscf /= ' ') lqdir=.TRUE.
IF(dvscf_star%open.and.nimage>1) CALL errore('phq_readin',&
'dvscf_star with image parallelization is not yet available',1)
IF(drho_star%open.and.nimage>1) CALL errore('phq_readin',&
'drho_star with image parallelization is not yet available',1)
IF (.NOT.ldisp) lqdir=.FALSE.
IF (i_cons /= 0) &
CALL errore('phq_readin',&
'The phonon code with constrained magnetization is not yet available',1)
IF (two_fermi_energies .AND. (ltetra .OR. lgauss)) &
CALL errore('phq_readin',&
'The phonon code with two fermi energies is not available for metals',1)
IF (tqr) CALL errore('phq_readin',&
'The phonon code with Q in real space not available',1)
IF (start_irr < 0 ) CALL errore('phq_readin', 'wrong start_irr',1)
!
IF (start_q <= 0 ) CALL errore('phq_readin', 'wrong start_q',1)
!
! the dynamical matrix is written in xml format if fildyn ends in
! .xml or in the noncollinear case.
!
xmldyn=has_xml(fildyn)
IF (noncolin) xmldyn=.TRUE.
!
! If a band structure calculation needs to be done do not open a file
! for k point
!
IF (reduce_io) io_level=0
restart = recover
!
! set masses to values read from input, if available;
! leave values read from file otherwise
!
DO it = 1, ntyp
IF (amass_input(it) < 0.0_DP) amass_input(it)= &
atom_weight(atomic_number(TRIM(atm(it))))
IF (amass_input(it) > 0.D0) amass(it) = amass_input(it)
IF (amass(it) <= 0.D0) CALL errore ('phq_readin', 'Wrong masses', it)
ENDDO
DEALLOCATE (amass_input)
lgamma_gamma=.FALSE.
IF (.NOT.ldisp) THEN
IF (nkstot==1.OR.(nkstot==2.AND.nspin==2)) THEN
lgamma_gamma=(lgamma.AND.(ABS(xk(1,1))<1.D-12) &
.AND.(ABS(xk(2,1))<1.D-12) &
.AND.(ABS(xk(3,1))<1.D-12) )
ENDIF
IF (nogg) lgamma_gamma=.FALSE.
IF ((nat_todo /= 0) .and. lgamma_gamma) CALL errore( &
'phq_readin', 'gamma_gamma tricks with nat_todo &
& not available. Use nogg=.true.', 1)
!
IF (lgamma) THEN
nksq = nks
ELSE
nksq = nks / 2
ENDIF
ENDIF
IF (lgamma_gamma.AND.ldiag) CALL errore('phq_readin','incompatible flags',1)
!
IF (tfixed_occ) &
CALL errore('phq_readin','phonon with arbitrary occupations not tested',1)
!
IF (elph.AND..NOT.lgauss) CALL errore ('phq_readin', 'Electron-&
&phonon only for metals', 1)
! IF (elph.AND.fildvscf.EQ.' ') CALL errore ('phq_readin', 'El-ph needs &
! &a DeltaVscf file', 1)
! There might be other variables in the input file which describe
! partial computation of the dynamical matrix. Read them here
!
CALL allocate_part ( nat )
!
IF ( nat_todo < 0 .OR. nat_todo > nat ) &
CALL errore ('phq_readin', 'nat_todo is wrong', 1)
IF (nat_todo.NE.0) THEN
IF (ionode) &
READ (5, *, iostat = ios) (atomo (na), na = 1, &
nat_todo)
CALL mp_bcast(ios, ionode_id, world_comm )
CALL errore ('phq_readin', 'reading atoms', ABS (ios) )
CALL mp_bcast(atomo, ionode_id, world_comm )
ENDIF
nat_todo_input=nat_todo
IF (epsil.AND.lgauss) &
CALL errore ('phq_readin', 'no elec. field with metals', 1)
IF (modenum > 0) THEN
IF ( ldisp ) &
CALL errore('phq_readin','Dispersion calculation and &
& single mode calculation not possibile !',1)
nat_todo = 0
ENDIF
IF (modenum > 0 .OR. lraman ) lgamma_gamma=.FALSE.
IF (.NOT.lgamma_gamma) asr=.FALSE.
!
IF (ldisp .AND. (nq1 .LE. 0 .OR. nq2 .LE. 0 .OR. nq3 .LE. 0)) &
CALL errore('phq_readin','nq1, nq2, and nq3 must be greater than 0',1)
!
CALL save_ph_input_variables()
RETURN
!
END SUBROUTINE phq_readin
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