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C
C SPDX-License-Identifier: BSD-3-Clause
C
* MB04ED EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX
PARAMETER ( NMAX = 60 )
INTEGER LDB, LDFG, LDQ, LDU1, LDU2, LDWORK, LDZ,
$ LIWORK
PARAMETER ( LDB = NMAX/2, LDFG = NMAX/2,
$ LDQ = NMAX, LDU1 = NMAX/2, LDU2 = NMAX/2,
$ LDWORK = 3*NMAX**2/2 + MAX( NMAX, 24 ) + 3,
$ LDZ = NMAX, LIWORK = NMAX + 9 )
*
* .. Local Scalars ..
CHARACTER COMPQ, COMPU, JOB
INTEGER I, INFO, J, N
*
* .. Local Arrays ..
INTEGER IWORK( LIWORK )
DOUBLE PRECISION ALPHAI( NMAX/2 ), ALPHAR( NMAX/2 ),
$ B( LDB, NMAX/2 ), BETA( NMAX/2 ),
$ DWORK( LDWORK ), FG( LDFG, NMAX/2+1 ),
$ Q( LDQ, NMAX ), U1( LDU1, NMAX/2 ),
$ U2( LDU2, NMAX/2 ), Z( LDZ, NMAX )
*
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
*
* .. External Subroutines ..
EXTERNAL MB04ED
*
* .. Intrinsic Functions ..
INTRINSIC MAX, MOD
*
* .. Executable statements ..
*
WRITE( NOUT, FMT = 99999 )
*
* Skip first line in data file.
*
READ( NIN, FMT = * )
READ( NIN, FMT = * ) JOB, COMPQ, COMPU, N
READ( NIN, FMT = * ) ( ( Z( I, J ), J = 1, N ), I = 1, N )
READ( NIN, FMT = * ) ( ( B( I, J ), J = 1, N/2 ), I = 1, N/2 )
READ( NIN, FMT = * ) ( ( FG( I, J ), J = 1, N/2+1 ), I = 1, N/2 )
IF( LSAME( COMPU, 'U' ) ) THEN
READ( NIN, FMT = * ) ( ( U1( I, J ), J = 1, N/2 ), I = 1, N/2 )
READ( NIN, FMT = * ) ( ( U2( I, J ), J = 1, N/2 ), I = 1, N/2 )
END IF
IF( N.LT.0 .OR. N.GT.NMAX .OR. MOD( N, 2 ).NE.0 ) THEN
WRITE( NOUT, FMT = 99998 ) N
ELSE
*
* Test of MB04ED.
*
CALL MB04ED( JOB, COMPQ, COMPU, N, Z, LDZ, B, LDB, FG, LDFG, Q,
$ LDQ, U1, LDU1, U2, LDU2, ALPHAR, ALPHAI, BETA,
$ IWORK, LIWORK, DWORK, LDWORK, INFO )
IF( INFO.NE.0 ) THEN
WRITE( NOUT, FMT = 99997 ) INFO
ELSE
WRITE( NOUT, FMT = 99996 )
DO 10 I = 1, N
WRITE( NOUT, FMT = 99995 ) ( Z(I,J), J = 1, N )
10 CONTINUE
WRITE( NOUT, FMT = 99994 )
DO 20 I = 1, N/2
WRITE( NOUT, FMT = 99995 ) ( B(I,J), J = 1, N/2 )
20 CONTINUE
WRITE( NOUT, FMT = 99993 )
DO 30 I = 1, N/2
WRITE( NOUT, FMT = 99995 ) ( FG(I,J), J = 1, N/2+1 )
30 CONTINUE
WRITE( NOUT, FMT = 99992 )
WRITE( NOUT, FMT = 99995 ) ( ALPHAR(I), I = 1, N/2 )
WRITE( NOUT, FMT = 99995 ) ( ALPHAI(I), I = 1, N/2 )
WRITE( NOUT, FMT = 99995 ) ( BETA(I), I = 1, N/2 )
WRITE( NOUT, FMT = 99991 )
DO 40 I = 1, N
WRITE( NOUT, FMT = 99995 ) ( Q( I, J ), J = 1, N )
40 CONTINUE
IF ( .NOT.LSAME( COMPU, 'N' ) ) THEN
WRITE( NOUT, FMT = 99990 )
DO 50 I = 1, N/2
WRITE( NOUT, FMT = 99995 ) ( U1( I, J ), J = 1, N/2 )
50 CONTINUE
WRITE( NOUT, FMT = 99989 )
DO 60 I = 1, N/2
WRITE( NOUT, FMT = 99995 ) ( U2( I, J ), J = 1, N/2 )
60 CONTINUE
END IF
END IF
END IF
STOP
99999 FORMAT ( 'MB04ED EXAMPLE PROGRAM RESULTS', 1X )
99998 FORMAT ( 'N is out of range.', /, 'N = ', I5 )
99997 FORMAT ( 'INFO on exit from MB04ED = ', I2 )
99996 FORMAT (/' The transformed matrix Z is' )
99995 FORMAT ( 60( 1X, F8.4 ) )
99994 FORMAT (/' The transformed matrix B is' )
99993 FORMAT (/' The transformed matrix FG is' )
99992 FORMAT (/' The real, imaginary, and beta parts of eigenvalues are'
$ )
99991 FORMAT (/' The matrix Q is ' )
99990 FORMAT (/' The upper left block of the matrix U is ' )
99989 FORMAT (/' The upper right block of the matrix U is ' )
END
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