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C
C SPDX-License-Identifier: BSD-3-Clause
C
* MB04AD EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX
PARAMETER ( NMAX = 50 )
INTEGER LDH, LDQ1, LDQ2, LDT, LDU11, LDU12, LDU21,
$ LDU22, LDWORK, LDZ, LIWORK
PARAMETER ( LDH = NMAX, LDQ1 = NMAX, LDQ2 = NMAX,
$ LDT = NMAX, LDU11 = NMAX/2, LDU12 = NMAX/2,
$ LDU21 = NMAX/2, LDU22 = NMAX/2,
$ LDWORK = 3*NMAX*NMAX + MAX( NMAX, 48 ) + 6,
$ LDZ = NMAX, LIWORK = NMAX + 18 )
DOUBLE PRECISION ZERO
PARAMETER ( ZERO = 0.0D0 )
*
* .. Local Scalars ..
CHARACTER COMPQ1, COMPQ2, COMPU1, COMPU2, JOB
INTEGER I, INFO, J, M, N
*
* .. Local Arrays ..
INTEGER IWORK( LIWORK )
DOUBLE PRECISION ALPHAI( NMAX/2 ), ALPHAR( NMAX/2 ),
$ BETA( NMAX/2 ), DWORK( LDWORK ),
$ H( LDH, NMAX ), Q1( LDQ1, NMAX ),
$ Q2( LDQ2, NMAX ), T( LDT, NMAX ),
$ U11( LDU11, NMAX/2 ), U12( LDU12, NMAX/2 ),
$ U21( LDU21, NMAX/2 ), U22( LDU22, NMAX/2 ),
$ Z( LDZ, NMAX )
*
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
*
* .. External Subroutines ..
EXTERNAL DLASET, MB04AD
*
* .. Intrinsic Functions ..
INTRINSIC MAX
*
* .. Executable Statements ..
*
WRITE( NOUT, FMT = 99999 )
* Skip the heading in the data file and read in the data.
READ( NIN, FMT = * )
READ( NIN, FMT = * ) JOB, COMPQ1, COMPQ2, COMPU1, COMPU2, N
IF( N.LT.0 .OR. N.GT.NMAX ) THEN
WRITE( NOUT, FMT = 99998 ) N
ELSE
READ( NIN, FMT = * ) ( ( Z( I, J ), J = 1, N ), I = 1, N )
READ( NIN, FMT = * ) ( ( H( I, J ), J = 1, N ), I = 1, N )
* Compute the eigenvalues of a real skew-Hamiltonian/Hamiltonian
* pencil (factored version).
CALL MB04AD( JOB, COMPQ1, COMPQ2, COMPU1, COMPU2, N, Z, LDZ, H,
$ LDH, Q1, LDQ1, Q2, LDQ2, U11, LDU11, U12, LDU12,
$ U21, LDU21, U22, LDU22, T, LDT, ALPHAR, ALPHAI,
$ BETA, IWORK, LIWORK, DWORK, LDWORK, INFO )
*
IF( INFO.NE.0 ) THEN
WRITE( NOUT, FMT = 99997 ) INFO
ELSE
M = N/2
CALL DLASET( 'Full', M, M, ZERO, ZERO, Z( M+1, 1 ), LDZ )
WRITE( NOUT, FMT = 99996 )
DO 10 I = 1, N
WRITE( NOUT, FMT = 99995 ) ( T( I, J ), J = 1, N )
10 CONTINUE
WRITE( NOUT, FMT = 99994 )
DO 20 I = 1, N
WRITE( NOUT, FMT = 99995 ) ( Z( I, J ), J = 1, N )
20 CONTINUE
WRITE( NOUT, FMT = 99993 )
DO 30 I = 1, N
WRITE( NOUT, FMT = 99995 ) ( H( I, J ), J = 1, N )
30 CONTINUE
IF( LSAME( COMPQ1, 'I' ) ) THEN
WRITE( NOUT, FMT = 99992 )
DO 40 I = 1, N
WRITE( NOUT, FMT = 99995 ) ( Q1( I, J ), J = 1, N )
40 CONTINUE
END IF
IF( LSAME( COMPQ2, 'I' ) ) THEN
WRITE( NOUT, FMT = 99991 )
DO 50 I = 1, N
WRITE( NOUT, FMT = 99995 ) ( Q2( I, J ), J = 1, N )
50 CONTINUE
END IF
IF( LSAME( COMPU1, 'I' ) ) THEN
WRITE( NOUT, FMT = 99990 )
DO 60 I = 1, M
WRITE( NOUT, FMT = 99995 ) ( U11( I, J ), J = 1, M )
60 CONTINUE
WRITE( NOUT, FMT = 99989 )
DO 70 I = 1, M
WRITE( NOUT, FMT = 99995 ) ( U12( I, J ), J = 1, M )
70 CONTINUE
END IF
IF( LSAME( COMPU2, 'I' ) ) THEN
WRITE( NOUT, FMT = 99988 )
DO 80 I = 1, M
WRITE( NOUT, FMT = 99995 ) ( U21( I, J ), J = 1, M )
80 CONTINUE
WRITE( NOUT, FMT = 99987 )
DO 90 I = 1, M
WRITE( NOUT, FMT = 99995 ) ( U22( I, J ), J = 1, M )
90 CONTINUE
END IF
WRITE( NOUT, FMT = 99986 )
WRITE( NOUT, FMT = 99995 ) ( ALPHAR( I ), I = 1, M )
WRITE( NOUT, FMT = 99985 )
WRITE( NOUT, FMT = 99995 ) ( ALPHAI( I ), I = 1, M )
WRITE( NOUT, FMT = 99984 )
WRITE( NOUT, FMT = 99995 ) ( BETA( I ), I = 1, M )
END IF
END IF
STOP
*
99999 FORMAT( 'MB04AD EXAMPLE PROGRAM RESULTS', 1X )
99998 FORMAT( 'N is out of range.', /, 'N = ', I5 )
99997 FORMAT( 'INFO on exit from MB04AD = ', I2 )
99996 FORMAT( 'The matrix T on exit is ' )
99995 FORMAT( 50( 1X, F8.4 ) )
99994 FORMAT( 'The matrix Z on exit is ' )
99993 FORMAT( 'The matrix H is ' )
99992 FORMAT( 'The matrix Q1 is ' )
99991 FORMAT( 'The matrix Q2 is ' )
99990 FORMAT( 'The upper left block of the matrix U1 is ' )
99989 FORMAT( 'The upper right block of the matrix U1 is ' )
99988 FORMAT( 'The upper left block of the matrix U2 is ' )
99987 FORMAT( 'The upper right block of the matrix U2 is ' )
99986 FORMAT( 'The vector ALPHAR is ' )
99985 FORMAT( 'The vector ALPHAI is ' )
99984 FORMAT( 'The vector BETA is ' )
END
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