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C
C SPDX-License-Identifier: BSD-3-Clause
C
* MB04OD EXAMPLE PROGRAM TEXT.
*
* .. Parameters ..
DOUBLE PRECISION ZERO
PARAMETER (ZERO = 0.0D0 )
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER MMAX, NMAX, PMAX
PARAMETER ( MMAX = 20, NMAX = 20, PMAX = 20 )
INTEGER LDA, LDB, LDC, LDR
PARAMETER ( LDA = PMAX, LDB = NMAX, LDC = PMAX,
$ LDR = NMAX )
INTEGER LDWORK
PARAMETER ( LDWORK = MAX( NMAX-1,MMAX ) )
* .. Local Scalars ..
CHARACTER*1 UPLO
INTEGER I, J, M, N, P
* .. Local Arrays ..
DOUBLE PRECISION A(LDA,NMAX), B(LDB,MMAX), C(LDC,MMAX),
$ DWORK(LDWORK), R(LDR,NMAX), TAU(NMAX)
* .. External Subroutines ..
EXTERNAL MB04OD
* .. 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 = * ) N, M, P, UPLO
IF ( N.LT.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99993 ) N
ELSE
IF ( M.LT.0 .OR. M.GT.MMAX ) THEN
WRITE ( NOUT, FMT = 99992 ) M
ELSE
IF ( P.LT.0 .OR. P.GT.PMAX ) THEN
WRITE ( NOUT, FMT = 99991 ) P
ELSE
READ ( NIN, FMT = * ) ( ( R(I,J), J = 1,N ), I = 1,N )
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,P )
READ ( NIN, FMT = * ) ( ( B(I,J), J = 1,M ), I = 1,N )
READ ( NIN, FMT = * ) ( ( C(I,J), J = 1,M ), I = 1,P )
* Compute and apply QR factorization.
CALL MB04OD( UPLO, N, M, P, R, LDR, A, LDA, B, LDB, C,
$ LDC, TAU, DWORK )
*
WRITE ( NOUT, FMT = 99997 )
DO 40 I = 1, N
DO 20 J = 1, I-1
R(I,J) = ZERO
20 CONTINUE
WRITE ( NOUT, FMT = 99996 ) ( R(I,J), J = 1,N )
40 CONTINUE
IF ( M.GT.0 ) THEN
WRITE ( NOUT, FMT = 99995 )
DO 60 I = 1, N
WRITE ( NOUT, FMT = 99996 ) ( B(I,J), J = 1,M )
60 CONTINUE
IF ( P.GT.0 ) THEN
WRITE ( NOUT, FMT = 99994 )
DO 80 I = 1, P
WRITE ( NOUT, FMT = 99996 ) ( C(I,J), J = 1,M )
80 CONTINUE
END IF
END IF
END IF
END IF
END IF
STOP
*
99999 FORMAT (' MB04OD EXAMPLE PROGRAM RESULTS',/1X)
99997 FORMAT (' The updated matrix R is ')
99996 FORMAT (20(1X,F10.4))
99995 FORMAT (' The updated matrix B is ')
99994 FORMAT (' The updated matrix C is ')
99993 FORMAT (/' N is out of range.',/' N = ',I5)
99992 FORMAT (/' M is out of range.',/' M = ',I5)
99991 FORMAT (/' P is out of range.',/' P = ',I5)
END
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