mirror of https://gitlab.com/QEF/q-e.git
50 lines
1.5 KiB
Fortran
50 lines
1.5 KiB
Fortran
!
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! Copyright (C) 2001 PWSCF group
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! This file is distributed under the terms of the
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! GNU General Public License. See the file `License'
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! in the root directory of the present distribution,
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! or http://www.gnu.org/copyleft/gpl.txt .
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!
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!-----------------------------------------------------------------------
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subroutine cft_wave (evc_g, evc_r, isw)
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!-----------------------------------------------------------------------
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!
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! Fourier-transformation of a wavefunction
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! evc_g(npwx): the wavefunction in G space
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! evc_r(nrxxs): the wavefunction in R space ("smooth" grid)
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! isw =+1: input: evc_g
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! output: evc_f = Fourier(evc_g)
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! evc_g is transformed according to igk-indexes
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! evc_r is set to zero at the beginning
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! isw =-1: input: evc_r
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! output: evc_g = evc_g + Fourier-1(evc_r)
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! evc_r is transformed according to igkq indexes
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!
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use pwcom
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use phcom
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implicit none
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integer :: isw
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complex(kind=DP) :: evc_g (npwx), evc_r (nrxxs)
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integer :: ir, ig
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if (isw.eq.1) then
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evc_r (:) = (0.d0, 0.d0)
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do ig = 1, npw
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evc_r (nls (igk (ig) ) ) = evc_g (ig)
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enddo
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call cft3s (evc_r, nr1s, nr2s, nr3s, nrx1s, nrx2s, nrx3s, +2)
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else if(isw.eq.-1) then
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call cft3s (evc_r, nr1s, nr2s, nr3s, nrx1s, nrx2s, nrx3s, -2)
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do ig = 1, npwq
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evc_g (ig) = evc_g (ig) + evc_r (nls (igkq (ig) ) )
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enddo
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else
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call errore (' cft_wave',' Wrong switch',1)
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endif
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return
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end subroutine cft_wave
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