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* TB01ND EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX, PMAX
PARAMETER ( NMAX = 20, PMAX = 20 )
INTEGER LDA, LDC, LDU, LDWORK
PARAMETER ( LDA = NMAX, LDC = PMAX, LDU = NMAX,
$ LDWORK = NMAX )
* .. Local Scalars ..
INTEGER I, INFO, J, N, P
CHARACTER*1 JOBU, UPLO
* .. Local Arrays ..
DOUBLE PRECISION A(LDA,NMAX), C(LDC,NMAX), U(LDU,NMAX),
$ DWORK(LDWORK)
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL TB01ND
* .. Executable Statements ..
*
WRITE ( NOUT, FMT = 99999 )
* Skip the heading in the data file and read the data.
READ ( NIN, FMT = '()' )
READ ( NIN, FMT = * ) N, P, JOBU, UPLO
IF ( N.LE.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99993 ) N
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), I = 1,N ), J = 1,N )
IF ( P.LE.0 .OR. P.GT.PMAX ) THEN
WRITE ( NOUT, FMT = 99992 ) P
ELSE
READ ( NIN, FMT = * ) ( ( C(I,J), J = 1,N ), I = 1,P )
IF ( LSAME( JOBU, 'U' ) )
$ READ ( NIN, FMT = * ) ( ( U(I,J), J = 1,N ), I = 1,N )
* Reduce the pair (A,C) to observer Hessenberg form.
CALL TB01ND( JOBU, UPLO, N, P, A, LDA, C, LDC, U, LDU,
$ DWORK, INFO )
*
IF ( INFO.NE.0 ) THEN
WRITE ( NOUT, FMT = 99998 ) INFO
ELSE
WRITE ( NOUT, FMT = 99997 )
DO 60 I = 1, N
WRITE ( NOUT, FMT = 99996 ) ( A(I,J), J = 1,N )
60 CONTINUE
WRITE ( NOUT, FMT = 99995 )
DO 80 I = 1, P
WRITE ( NOUT, FMT = 99996 ) ( C(I,J), J = 1,N )
80 CONTINUE
IF ( LSAME( JOBU, 'I' ).OR.LSAME( JOBU, 'U' ) ) THEN
WRITE ( NOUT, FMT = 99994 )
DO 100 I = 1, N
WRITE ( NOUT, FMT = 99996 ) ( U(I,J), J = 1,N )
100 CONTINUE
END IF
END IF
END IF
END IF
STOP
*
99999 FORMAT (' TB01ND EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from TB01ND = ',I2)
99997 FORMAT (' The transformed state transition matrix is ')
99996 FORMAT (20(1X,F8.4))
99995 FORMAT (/' The transformed output matrix is ')
99994 FORMAT (/' The transformation matrix that reduces (A,C) to obser',
$ 'ver Hessenberg form is ')
99993 FORMAT (/' N is out of range.',/' N = ',I5)
99992 FORMAT (/' P is out of range.',/' P = ',I5)
END
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