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C
C SPDX-License-Identifier: BSD-3-Clause
C
* TG01GD EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER LMAX, NMAX, MMAX, PMAX
PARAMETER ( LMAX = 20, NMAX = 20, MMAX = 20, PMAX = 20 )
INTEGER LDA, LDB, LDC, LDD, LDE
PARAMETER ( LDA = LMAX, LDB = LMAX, LDC = PMAX,
$ LDD = PMAX, LDE = LMAX )
INTEGER LDWORK
PARAMETER ( LDWORK = MIN( LMAX, NMAX ) +
$ MAX( 3*NMAX - 1, MMAX, LMAX ) +
$ 2*LMAX*NMAX + LMAX*MMAX + PMAX*NMAX )
* .. Local Scalars ..
CHARACTER*1 JOBS
INTEGER I, INFO, INFRED, J, L, LR, M, N, NR, P, RANKE
DOUBLE PRECISION TOL
* .. Local Arrays ..
INTEGER IWORK(NMAX)
DOUBLE PRECISION A(LDA,NMAX), B(LDB,MMAX), C(LDC,NMAX),
$ D(LDD,MMAX), DWORK(LDWORK), E(LDE,NMAX)
* .. External Subroutines ..
EXTERNAL TG01GD
* .. Intrinsic Functions ..
INTRINSIC MAX, MIN
* .. Executable Statements ..
*
WRITE ( NOUT, FMT = 99999 )
* Skip the heading in the data file and read the data.
READ ( NIN, FMT = '()' )
READ ( NIN, FMT = * ) L, N, M, P, JOBS, TOL
IF ( L.LT.0 .OR. L.GT.LMAX ) THEN
WRITE ( NOUT, FMT = 99989 ) L
ELSE
IF ( N.LT.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99988 ) N
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,L )
READ ( NIN, FMT = * ) ( ( E(I,J), J = 1,N ), I = 1,L )
IF ( M.LT.0 .OR. M.GT.MMAX ) THEN
WRITE ( NOUT, FMT = 99987 ) M
ELSE
READ ( NIN, FMT = * ) ( ( B(I,J), J = 1,M ), I = 1,L )
IF ( P.LT.0 .OR. P.GT.PMAX ) THEN
WRITE ( NOUT, FMT = 99986 ) P
ELSE
READ ( NIN, FMT = * ) ( ( C(I,J), J = 1,N ), I = 1,P )
READ ( NIN, FMT = * ) ( ( D(I,J), J = 1,M ), I = 1,P )
* Find the reduced descriptor system
* (A-lambda E,B,C,D).
CALL TG01GD( JOBS, L, N, M, P, A, LDA, E, LDE, B, LDB,
$ C, LDC, D, LDD, LR, NR, RANKE, INFRED,
$ TOL, IWORK, DWORK, LDWORK, INFO )
*
IF ( INFO.NE.0 ) THEN
WRITE ( NOUT, FMT = 99998 ) INFO
ELSE
WRITE ( NOUT, FMT = 99994 ) RANKE
WRITE ( NOUT, FMT = 99997 )
DO 10 I = 1, LR
WRITE ( NOUT, FMT = 99995 ) ( A(I,J), J = 1,NR )
10 CONTINUE
WRITE ( NOUT, FMT = 99996 )
DO 20 I = 1, LR
WRITE ( NOUT, FMT = 99995 ) ( E(I,J), J = 1,NR )
20 CONTINUE
WRITE ( NOUT, FMT = 99993 )
DO 30 I = 1, LR
WRITE ( NOUT, FMT = 99995 ) ( B(I,J), J = 1,M )
30 CONTINUE
WRITE ( NOUT, FMT = 99992 )
DO 40 I = 1, P
WRITE ( NOUT, FMT = 99995 ) ( C(I,J), J = 1,NR )
40 CONTINUE
WRITE ( NOUT, FMT = 99991 )
DO 50 I = 1, P
WRITE ( NOUT, FMT = 99995 ) ( D(I,J), J = 1,M )
50 CONTINUE
END IF
END IF
END IF
END IF
END IF
STOP
*
99999 FORMAT (' TG01GD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from TG01GD = ',I2)
99997 FORMAT (/' The reduced state dynamics matrix is ')
99996 FORMAT (/' The reduced descriptor matrix is ')
99995 FORMAT (20(1X,F8.4))
99994 FORMAT (' Rank of matrix E =', I5)
99993 FORMAT (/' The reduced input/state matrix is ')
99992 FORMAT (/' The reduced state/output matrix is ')
99991 FORMAT (/' The transformed feedthrough matrix is ')
99989 FORMAT (/' L is out of range.',/' L = ',I5)
99988 FORMAT (/' N is out of range.',/' N = ',I5)
99987 FORMAT (/' M is out of range.',/' M = ',I5)
99986 FORMAT (/' P is out of range.',/' P = ',I5)
END
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