C Program GMT to compute general transposed matrix GM2=GM1T.
C
C Version: 5.40
C Date: 2000, February 21
C
C Coded by Petr Bulant
C     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 of input general matrix GM1
C             and the number of columns of output general matrix 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 matrix GM1 and the
C             number of rows of matrix GM2.
C             Default: M2=' ' means that the number is 1.
C Filenames of the files with the matrices:
C     GM1='string'... Name of the input file containing general matrix
C             GM1.
C             No default, 'GM1' must be specified and cannot be blank.
C     GM2='string'... Name of the output file to contain general matrix
C             GM2=GM1T (GM1 transposed).
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 FILE1
      INTEGER M1,M2,M1M2,LU1,I1,I2
      PARAMETER (LU1=1)
C
C-----------------------------------------------------------------------
C
C     Reading name of SEP file with input data:
      WRITE(*,'(A)') '+GMT: Enter input filename: '
      FILE1=' '
      READ(*,*) FILE1
C
C     Reading all data from the SEP file into the memory:
      IF (FILE1.NE.' ') THEN
        CALL RSEP1(LU1,FILE1)
      ELSE
C       GMT-01
        CALL ERROR('GMT-01: SEP file not given')
C       Input file in the form of the SEP (Stanford Exploration Project)
C       parameter or history file must be specified.
C       There is no default filename.
      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 (2*M1M2.GT.MRAM) THEN
C       GMT-02
        CALL ERROR('GMT-02: Small dimension MRAM of array RAM')
      ENDIF
C
C     Reading input matrices:
      CALL RSEP3T('GM1',FILE1,' ')
      IF (FILE1.EQ.' ') THEN
C       GMT-03
        CALL ERROR('GMT-03: Input file with matrix GM1 not given.')
      ENDIF
      CALL RMAT(LU1,FILE1,M1,M2,RAM)
      CALL RSEP3T('GM2',FILE1,' ')
      IF (FILE1.EQ.' ') THEN
C       GMT-05
        CALL ERROR('GMT-05: Output file with matrix GM2 not given.')
      ENDIF
C
C     Multiplication:
      WRITE(*,'(A)') '+GMT: Calculating...        '
      DO 13 I2=1,M2
        DO 12 I1=1,M1
          RAM(M1M2+(I1-1)*M2+I2)=RAM((I2-1)*M1+I1)
  12    CONTINUE
  13  CONTINUE
C
C     Writing output matrix GM2:
      CALL WMAT(LU1,FILE1,M2,M1,RAM(M1M2+1))
C
      WRITE(*,'(A)') '+GMT: Finished.             '
      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