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C
C SPDX-License-Identifier: BSD-3-Clause
C
* MB04UD EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER MMAX, NMAX
PARAMETER ( MMAX = 20, NMAX = 20 )
INTEGER LDA, LDE, LDQ, LDZ
PARAMETER ( LDA = MMAX, LDE = MMAX, LDQ = MMAX,
$ LDZ = NMAX )
INTEGER LDWORK
PARAMETER ( LDWORK = MAX( NMAX,MMAX ) )
* PARAMETER ( LDWORK = NMAX+MMAX )
* .. Local Scalars ..
DOUBLE PRECISION TOL
INTEGER I, INFO, J, M, N, RANKE
CHARACTER*1 JOBQ, JOBZ
* .. Local Arrays ..
DOUBLE PRECISION A(LDA,NMAX), DWORK(LDWORK), E(LDE,NMAX),
$ Q(LDQ,MMAX), Z(LDZ,NMAX)
INTEGER ISTAIR(MMAX)
* .. External Subroutines ..
EXTERNAL MB04UD
* .. Intrinsic Functions ..
INTRINSIC MAX
* .. Executable Statements ..
*
WRITE ( NOUT, FMT = 99999 )
* Skip the heading in the data file and read the data.
READ ( NIN, FMT = '()' )
READ ( NIN, FMT = * ) M, N, TOL
IF ( M.LT.0 .OR. M.GT.MMAX ) THEN
WRITE ( NOUT, FMT = 99993 ) M
ELSE IF ( N.LT.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99992 ) N
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,M )
READ ( NIN, FMT = * ) ( ( E(I,J), J = 1,N ), I = 1,M )
JOBQ = 'N'
JOBZ = 'N'
* Reduce E to column echelon form and compute Q'*A*Z.
CALL MB04UD( JOBQ, JOBZ, M, N, A, LDA, E, LDE, Q, LDQ, Z, LDZ,
$ RANKE, ISTAIR, TOL, DWORK, INFO )
*
IF ( INFO.NE.0 ) THEN
WRITE ( NOUT, FMT = 99998 ) INFO
ELSE
WRITE ( NOUT, FMT = 99991 )
DO 10 I = 1, M
WRITE ( NOUT, FMT = 99996 ) ( A(I,J), J = 1,N )
10 CONTINUE
WRITE ( NOUT, FMT = 99997 )
DO 100 I = 1, M
WRITE ( NOUT, FMT = 99996 ) ( E(I,J), J = 1,N )
100 CONTINUE
WRITE ( NOUT, FMT = 99995 ) RANKE
WRITE ( NOUT, FMT = 99994 ) ( ISTAIR(I), I = 1,M )
END IF
END IF
STOP
*
99999 FORMAT (' MB04UD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from MB04UD = ',I2)
99997 FORMAT (' The transformed matrix E is ')
99996 FORMAT (20(1X,F8.4))
99995 FORMAT (/' The computed rank of E = ',I2)
99994 FORMAT (/' ISTAIR is ',/20(1X,I5))
99993 FORMAT (/' M is out of range.',/' M = ',I5)
99992 FORMAT (/' N is out of range.',/' N = ',I5)
99991 FORMAT (' The transformed matrix A is ')
END
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