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C
C SPDX-License-Identifier: BSD-3-Clause
C
* SG03AD EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX
PARAMETER ( NMAX = 20 )
INTEGER LDA, LDE, LDQ, LDX, LDZ
PARAMETER ( LDA = NMAX, LDE = NMAX, LDQ = NMAX,
$ LDX = NMAX, LDZ = NMAX )
INTEGER LIWORK, LDWORK
PARAMETER ( LIWORK = NMAX**2,
$ LDWORK = MAX( 2*NMAX**2, 4*NMAX ) )
* .. Local Scalars ..
CHARACTER*1 DICO, FACT, JOB, TRANS, UPLO
DOUBLE PRECISION FERR, SCALE, SEP
INTEGER I, INFO, J, N
* .. Local Arrays ..
INTEGER IWORK(LIWORK)
DOUBLE PRECISION A(LDA,NMAX), ALPHAI(NMAX), ALPHAR(NMAX),
$ BETA(NMAX), DWORK(LDWORK), E(LDE,NMAX),
$ Q(LDQ,NMAX), X(LDX,NMAX), Z(LDZ,NMAX)
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL SG03AD
* .. 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, JOB, DICO, FACT, TRANS, UPLO
IF ( N.LT.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99993 ) N
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,N )
READ ( NIN, FMT = * ) ( ( E(I,J), J = 1,N ), I = 1,N )
IF ( LSAME ( FACT, 'F' ) ) THEN
READ ( NIN, FMT = * ) ( ( Q(I,J), J = 1,N ), I = 1,N )
READ ( NIN, FMT = * ) ( ( Z(I,J), J = 1,N ), I = 1,N )
END IF
IF ( .NOT.LSAME ( JOB, 'S' ) )
$ READ ( NIN, FMT = * ) ( ( X(I,J), J = 1,N ), I = 1,N )
* Find the solution matrix X and the scalar SEP.
CALL SG03AD( DICO, JOB, FACT, TRANS, UPLO, N, A, LDA, E, LDE,
$ Q, LDQ, Z, LDZ, X, LDX, SCALE, SEP, FERR, ALPHAR,
$ ALPHAI, BETA, IWORK, DWORK, LDWORK, INFO )
IF ( INFO.NE.0 ) THEN
WRITE ( NOUT, FMT = 99998 ) INFO
ELSE
IF ( LSAME ( JOB, 'B' ) .OR. LSAME ( JOB, 'S' ) ) THEN
WRITE ( NOUT, FMT = 99997 ) SEP
WRITE ( NOUT, FMT = 99996 ) FERR
END IF
IF ( LSAME ( JOB, 'B' ) .OR. LSAME ( JOB, 'X' ) ) THEN
WRITE ( NOUT, FMT = 99995 ) SCALE
DO 20 I = 1, N
WRITE ( NOUT, FMT = 99994 ) ( X(I,J), J = 1,N )
20 CONTINUE
END IF
END IF
END IF
STOP
*
99999 FORMAT (' SG03AD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from SG03AD = ',I2)
99997 FORMAT (' SEP = ',D8.2)
99996 FORMAT (' FERR = ',D8.2)
99995 FORMAT (' SCALE = ',D8.2,//' The solution matrix X is ')
99994 FORMAT (20(1X,F8.4))
99993 FORMAT (/' N is out of range.',/' N = ',I5)
END
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