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C
C SPDX-License-Identifier: BSD-3-Clause
C
* MB03SD EXAMPLE PROGRAM TEXT.
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX
PARAMETER ( NMAX = 20 )
INTEGER LDA, LDQG
PARAMETER ( LDA = NMAX, LDQG = NMAX )
INTEGER LDWORK
PARAMETER ( LDWORK = NMAX*( NMAX+1 ) )
* .. Local Scalars ..
INTEGER I, INFO, J, N
CHARACTER*1 JOBSCL
* .. Local Arrays ..
DOUBLE PRECISION A(LDA,NMAX), DWORK(LDWORK), QG(LDQG,NMAX+1),
$ WI(NMAX), WR(NMAX)
* .. External Subroutines ..
EXTERNAL MB03SD
* .. Executable Statements ..
*
WRITE ( NOUT, FMT = 99999 )
* Skip the heading in the data file and read the data.
* NOTE: input must define a square-reduced Hamiltonian matrix.
READ ( NIN, FMT = '()' )
READ ( NIN, FMT = * ) N, JOBSCL
IF ( N.LT.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99998 ) N
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,N )
READ ( NIN, FMT = * ) ( ( QG(J,I+1), I = J,N ), J = 1,N )
READ ( NIN, FMT = * ) ( ( QG(I,J), I = J,N ), J = 1,N )
* Compute the eigenvalues.
CALL MB03SD( JOBSCL, N, A, LDA, QG, LDQG, WR, WI, DWORK,
$ LDWORK, INFO )
*
IF ( INFO.NE.0 ) THEN
WRITE ( NOUT, FMT = 99997 ) INFO
ELSE
* Show the computed eigenvalues.
WRITE ( NOUT, FMT = 99996 )
DO 10 I = 1, N
WRITE ( NOUT, FMT = 99995 ) WR(I), ' + (', WI(I), ')i'
10 CONTINUE
DO 20 I = N, 1, -1
WRITE ( NOUT, FMT = 99995 ) -WR(I), ' + (', -WI(I), ')i'
20 CONTINUE
END IF
END IF
STOP
*
99999 FORMAT (' MB03SD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (/' N is out of range.',/' N = ',I5)
99997 FORMAT (' INFO on exit from MB03SD = ',I2)
99996 FORMAT (/' The eigenvalues are ')
99995 FORMAT (1X,F8.4,A,F8.4,A)
END
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