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C
C SPDX-License-Identifier: BSD-3-Clause
C
* SB03MD EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX
PARAMETER ( NMAX = 20 )
INTEGER LDA, LDC, LDU
PARAMETER ( LDA = NMAX, LDC = NMAX, LDU = NMAX )
INTEGER LDWORK, LIWORK
PARAMETER ( LDWORK = 2*NMAX*NMAX + 3*NMAX,
$ LIWORK = NMAX*NMAX )
* .. Local Scalars ..
INTEGER I, INFO, J, N
CHARACTER*1 DICO, FACT, JOB, TRANA
DOUBLE PRECISION FERR, SCALE, SEP
* .. Local Arrays ..
INTEGER IWORK(LIWORK)
DOUBLE PRECISION A(LDA,NMAX), C(LDC,NMAX), DWORK(LDWORK),
$ U(LDU,NMAX), WI(NMAX), WR(NMAX)
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL SB03MD
* .. Executable Statements ..
*
WRITE ( NOUT, FMT = 99999 )
* Skip the heading in the data file and read the data.
READ ( NIN, FMT = '()' )
READ ( NIN, FMT = * ) N, DICO, FACT, JOB, TRANA
IF ( N.LE.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99995 ) N
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,N )
IF ( LSAME( FACT, 'F' ) ) READ ( NIN, FMT = * )
$ ( ( U(I,J), J = 1,N ), I = 1,N )
READ ( NIN, FMT = * ) ( ( C(I,J), J = 1,N ), I = 1,N )
* Find the solution matrix X.
CALL SB03MD( DICO, JOB, FACT, TRANA, N, A, LDA, U, LDU, C, LDC,
$ SCALE, SEP, FERR, WR, WI, IWORK, DWORK, LDWORK,
$ INFO )
*
IF ( INFO.NE.0 ) THEN
WRITE ( NOUT, FMT = 99998 ) INFO
ELSE
WRITE ( NOUT, FMT = 99997 )
DO 20 I = 1, N
WRITE ( NOUT, FMT = 99996 ) ( C(I,J), J = 1,N )
20 CONTINUE
WRITE ( NOUT, FMT = 99994 ) SCALE
IF ( .NOT.LSAME( JOB, 'X' ) )
$ WRITE ( NOUT, FMT = 99993 ) SEP
IF ( LSAME( JOB, 'B' ) )
$ WRITE ( NOUT, FMT = 99992 ) FERR
END IF
END IF
STOP
*
99999 FORMAT (' SB03MD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from SB03MD = ',I2)
99997 FORMAT (' The solution matrix X is ')
99996 FORMAT (20(1X,F8.4))
99995 FORMAT (/' N is out of range.',/' N = ',I5)
99994 FORMAT (/' Scaling factor = ',F8.4)
99993 FORMAT (/' Estimated separation = ',F8.4)
99992 FORMAT (/' Estimated forward error bound = ',F8.4)
END
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