C
C Program DMGM to compute product GM2=DM1*GM1 of diagonal matrix DM1
C and general matrix GM1.
C
C Version: 5.40
C Date: 2000, February 21
C
C Coded by Petr Bulant
C     Department of Geophysics, Charles University Prague,
C     Ke Karlovu 3, 121 16 Praha 2, Czech Republic,
C     E-mail: bulant@seis.karlov.mff.cuni.cz
C
C.......................................................................
C                                                    
C Description of data files:
C
C Input data read from the standard input device (*):
C     The data are read by the list directed input (free format) and
C     consist of a single string 'SEP':
C     'SEP'...String in apostrophes containing the name of the input
C             SEP parameter or history file with the input data.
C     No default, 'SEP' must be specified and cannot be blank.
C
C                                                     
C Input data file 'SEP':
C     File 'SEP' has the form of the SEP
C     parameter file.  The parameters, which do not differ from their
C     defaults, need not be specified in file 'SEP'.
C Data specifying dimensions of the matrices:
C     M1='string'... Name of the file containing a single integer number
C             specifying the number of rows and columns of matrix DM1
C             and rows of matrices GM1 and GM2.
C             Default: M1=' ' means that the number is 1.
C     M2='string'... Name of the file containing a single integer number
C             specifying the number of columns of matrices GM1 and GM2.
C             Default: M2=' ' means that the number is 1.
C Filenames of the files with the matrices:
C     DM1='string' ... Name of the file containing matrix DM1 (input).
C             No default, 'DM1' must be specified and cannot be blank.
C     GM1='string' ... Name of the file containing matrix GM1 (input).
C             No default, 'GM1' must be specified and cannot be blank.
C     GM2='string' ... Name of the file containing matrix GM2 (output).
C             No default, 'GM2' must be specified and cannot be blank.
C     For general description of the files with matrices refer to file
C     forms.htm.
C
C-----------------------------------------------------------------------
C Subroutines and external functions required:
      EXTERNAL ERROR,RSEP1,RSEP3T,RMAT,WMAT
C     ERROR ... File error.for.
C     RSEP1,RSEP3T ... File sep.for.
C     RMAT,WMAT ... File forms.for.
C
C Common block /RAMC/:
      INCLUDE 'ram.inc'
C     ram.inc
C
      CHARACTER*80 FILSEP,FILE1,FILE2,FILE3
      INTEGER M1,M2,M1M2,LU1
      PARAMETER (LU1=1)
C-----------------------------------------------------------------------
C
C     Reading in a name of the file with the input data:
      WRITE(*,'(A)') '+DMGM: Enter input filename: '
      FILSEP=' '
      READ(*,*) FILSEP
C
C     Reading all the data from the SEP file into the memory:
      IF (FILSEP.NE.' ') THEN
        CALL RSEP1(LU1,FILSEP)
      ELSE
C       DMGM-01
        CALL ERROR('DMGM-01: SEP file not given')
      ENDIF
C
C     Reading the dimensions of the matrices:
      CALL RSEP3T('M1',FILE1,' ')
      IF (FILE1.EQ.' ') THEN
        M1=1
      ELSE
        OPEN(LU1,FILE=FILE1,STATUS='OLD')
        READ(LU1,*) M1
        CLOSE(LU1)
      ENDIF
      CALL RSEP3T('M2',FILE1,' ')
      IF (FILE1.EQ.' ') THEN
        M2=1
      ELSE
        OPEN(LU1,FILE=FILE1,STATUS='OLD')
        READ(LU1,*) M2
        CLOSE(LU1)
      ENDIF
      M1M2=M1*M2
C
      IF (M1+M1M2.GT.MRAM) THEN
C       DMGM-02
        CALL ERROR('DMGM-02: Small dimension MRAM of array RAM')
      END IF
C
C     Reading in the names of the files with the matrices:
      CALL RSEP3T('DM1',FILE1,' ')
      IF (FILE1.EQ.' ') THEN
C       DMGM-03
        CALL ERROR('DMGM-03: Input file with matrix DM1 not given.')
      ENDIF
      CALL RSEP3T('GM1',FILE2,' ')
      IF (FILE2.EQ.' ') THEN
C       DMGM-04
        CALL ERROR('DMGM-04: Input file with matrix GM1 not given.')
      ENDIF
      CALL RSEP3T('GM2',FILE3,' ')
      IF (FILE3.EQ.' ') THEN
C       DMGM-05
        CALL ERROR('DMGM-05: Output file with matrix GM2 not given.')
      ENDIF
C
C     Reading input matrices:
      CALL RMAT(LU1,FILE1,M1,1,RAM)
      CALL RMAT(LU1,FILE2,M1,M2,RAM(M1+1))
C
      WRITE(*,'(A)') '+DMGM: Working...            '
C
C     Multiplication:
      DO 12 I1=1,M1
        AUX=RAM(I1)
        DO 11 I2=M1+I1,M1+M1*M2,M1
          RAM(I2)=AUX*RAM(I2)
   11   CONTINUE
   12 CONTINUE
C
C     Writing output matrix:
      IF (FILE3.NE.' ') THEN
        CALL WMAT(LU1,FILE3,M1,M2,RAM(M1+1))
      ENDIF
      WRITE(*,'(A)') '+DMGM: Done.                 '
C
      STOP
      END
C
C=======================================================================
C
      INCLUDE 'error.for'
C     error.for
      INCLUDE 'sep.for'
C     sep.for
      INCLUDE 'forms.for'
C     forms.for
      INCLUDE 'length.for'
C     length.for
C
C=======================================================================
C