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C
C SPDX-License-Identifier: BSD-3-Clause
C
* MB04GD EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
DOUBLE PRECISION ZERO
PARAMETER ( ZERO = 0.0D0 )
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX, MMAX
PARAMETER ( NMAX = 10, MMAX = 10 )
INTEGER LDA
PARAMETER ( LDA = MMAX )
INTEGER LDTAU
PARAMETER ( LDTAU = MIN(MMAX,NMAX) )
INTEGER LDWORK
PARAMETER ( LDWORK = 3*MMAX )
* .. Local Scalars ..
INTEGER I, INFO, J, M, N
* .. Local Arrays ..
DOUBLE PRECISION A(LDA,NMAX), DWORK(LDWORK), TAU(LDTAU)
INTEGER JPVT(MMAX)
* .. External Subroutines ..
EXTERNAL DLASET, MB04GD
* .. Intrinsic Functions ..
INTRINSIC MIN
* .. 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
IF ( N.LT.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99972 ) N
ELSE
IF ( M.LT.0 .OR. M.GT.MMAX ) THEN
WRITE ( NOUT, FMT = 99971 ) M
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,M )
READ ( NIN, FMT = * ) ( JPVT(I), I = 1,M )
* RQ with row pivoting.
CALL MB04GD( M, N, A, LDA, JPVT, TAU, DWORK, INFO )
*
IF ( INFO.NE.0 ) THEN
WRITE ( NOUT, FMT = 99998 ) INFO
ELSE
WRITE ( NOUT, FMT = 99994 ) ( JPVT(I), I = 1,M )
WRITE ( NOUT, FMT = 99990 )
IF ( M.GE.N ) THEN
IF ( N.GT.1 )
$ CALL DLASET( 'Lower', N-1, N-1, ZERO, ZERO,
$ A(M-N+2,1), LDA )
ELSE
CALL DLASET( 'Full', M, N-M-1, ZERO, ZERO, A, LDA )
CALL DLASET( 'Lower', M, M, ZERO, ZERO, A(1,N-M),
$ LDA )
END IF
DO 20 I = 1, M
WRITE ( NOUT, FMT = 99989 ) ( A(I,J), J = 1,N )
20 CONTINUE
END IF
END IF
END IF
*
STOP
*
99999 FORMAT (' MB04GD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from MB04GD = ',I2)
99994 FORMAT (' Row permutations are ',/(20(I3,2X)))
99990 FORMAT (/' The matrix A is ')
99989 FORMAT (20(1X,F8.4))
99972 FORMAT (/' N is out of range.',/' N = ',I5)
99971 FORMAT (/' M is out of range.',/' M = ',I5)
END
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