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C
C SPDX-License-Identifier: BSD-3-Clause
C
* MB05MD EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX
PARAMETER ( NMAX = 20 )
INTEGER LDA, LDV, LDY
PARAMETER ( LDA = NMAX, LDV = NMAX, LDY = NMAX )
INTEGER LDWORK
PARAMETER ( LDWORK = 4*NMAX )
* .. Local Scalars ..
DOUBLE PRECISION DELTA
INTEGER I, INFO, J, N
CHARACTER*1 BALANC
* .. Local Arrays ..
DOUBLE PRECISION A(LDA,NMAX), DWORK(LDWORK), V(LDV,NMAX),
$ VALI(NMAX), VALR(NMAX), Y(LDY,NMAX)
INTEGER IWORK(NMAX)
* .. External Subroutines ..
EXTERNAL MB05MD
* .. Executable Statements ..
*
WRITE ( NOUT, FMT = 99999 )
* Skip the heading in the data file and read the data.
READ ( NIN, FMT = '()' )
BALANC = 'N'
READ ( NIN, FMT = * ) N, DELTA
IF ( N.LE.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99992 ) N
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,N )
* Find the exponential of the real non-defective matrix A*DELTA.
CALL MB05MD( BALANC, N, DELTA, A, LDA, V, LDV, Y, LDY, VALR,
$ VALI, 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 ) ( A(I,J), J = 1,N )
20 CONTINUE
WRITE ( NOUT, FMT = 99995 ) ( VALR(I), VALI(I), I = 1,N )
WRITE ( NOUT, FMT = 99994 )
DO 40 I = 1, N
WRITE ( NOUT, FMT = 99996 ) ( V(I,J), J = 1,N )
40 CONTINUE
WRITE ( NOUT, FMT = 99993 )
DO 60 I = 1, N
WRITE ( NOUT, FMT = 99996 ) ( Y(I,J), J = 1,N )
60 CONTINUE
END IF
END IF
STOP
*
99999 FORMAT (' MB05MD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from MB05MD = ',I2)
99997 FORMAT (' The solution matrix exp(A*DELTA) is ')
99996 FORMAT (20(1X,F8.4))
99995 FORMAT (/' The eigenvalues of A are ',/20(2F5.1,'*j '))
99994 FORMAT (/' The eigenvector matrix for A is ')
99993 FORMAT (/' The inverse eigenvector matrix for A (premultiplied by'
$ ,' exp(Lambda*DELTA)) is ')
99992 FORMAT (/' N is out of range.',/' N = ',I5)
END
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