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https://github.com/triqs/dft_tools
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99 lines
3.5 KiB
Fortran
99 lines
3.5 KiB
Fortran
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c ******************************************************************************
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c
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c TRIQS: a Toolbox for Research in Interacting Quantum Systems
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c
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c Copyright (C) 2011 by L. Pourovskii, V. Vildosola, C. Martins, M. Aichhorn
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c
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c TRIQS is free software: you can redistribute it and/or modify it under the
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c terms of the GNU General Public License as published by the Free Software
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c Foundation, either version 3 of the License, or (at your option) any later
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c version.
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c
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c TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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c FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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c details.
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c
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c You should have received a copy of the GNU General Public License along with
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c TRIQS. If not, see <http://www.gnu.org/licenses/>.
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c
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c *****************************************************************************/
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SUBROUTINE read_k_list
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C %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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C %% %%
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C %% This subroutine reads the labels of high-symmetry points %%
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C %% along the k-path chosen for plotting the k-resolved spectral %%
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C %% function. %%
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C %% %%
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C %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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C Definiton of the variables :
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C ---------------------------
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USE bands
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USE file_names
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IMPLICIT NONE
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CHARACTER(len=100) :: buf
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INTEGER :: ilab, pos, i
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C
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C ========================================================================
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C Determination of the total number of labels and the number of k-points :
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C ========================================================================
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buf=' '
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nlab=0
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pos=0
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C nlab will count the number of labels met.
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C pos will count the number of lines
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C (which is also the number of k-points along the k-path)
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DO WHILE (buf(1:3).NE.'END')
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READ(iuklist,'(a)') buf
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pos=pos+1
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IF(buf(1:1).NE.' ') THEN
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nlab=nlab+1
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ENDIF
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ENDDO
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C pos is now the number of line of the file.
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C nlab is the number of labels, includind the label 'END'
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C
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C nkband = number of k-points along the k-path.
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nkband=pos-1
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C The label 'END' must not be taken into account
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nlab=nlab-1
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C The last line of the file case.klist_band contains "END".
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C So the while loop can have an end too.
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C
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C =============================
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C Determination of the labels :
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C =============================
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ALLOCATE(labels(nlab))
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C The file case.klist_band is read again.
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REWIND(iuklist)
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ilab=0
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DO pos=1,nkband
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READ(iuklist,'(a)') buf
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IF(buf(1:1).NE.' ') THEN
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ilab=ilab+1
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labels(ilab)%pos=pos
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C labels(ilab)%pos is the number of the corresponding k-point
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i=INDEX(buf,' ')
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C determination of the size of buf
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C (index is a function which finds the index of ' ' in buf)
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labels(ilab)%kname=' '
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labels(ilab)%kname(1:i)=buf(1:i)
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C labels(ilab)%kname is the corresponding label
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ENDIF
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ENDDO
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C ======================================
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C Printing the labels read for testing :
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C ======================================
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WRITE(*,*) nkband
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WRITE(*,*)'nlab = ', nlab
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DO i=1,nlab
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WRITE(*,*) i, labels(i)%pos, labels(i)%kname
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ENDDO
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C
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RETURN
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END
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