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C
C SPDX-License-Identifier: BSD-3-Clause
C
* AB13FD EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX
PARAMETER ( NMAX = 20 )
INTEGER LDA
PARAMETER ( LDA = NMAX )
INTEGER LDWORK
PARAMETER ( LDWORK = 3*NMAX*( NMAX + 2 ) )
INTEGER LCWORK
PARAMETER ( LCWORK = NMAX*( NMAX + 3 ) )
* .. Local Scalars ..
INTEGER I, INFO, J, N
DOUBLE PRECISION BETA, OMEGA, TOL
* .. Local Arrays ..
DOUBLE PRECISION A(LDA,NMAX), DWORK(LDWORK)
COMPLEX*16 CWORK(LCWORK)
* .. External Subroutines ..
EXTERNAL AB13FD, UD01MD
* ..
* .. Executable Statements ..
*
WRITE ( NOUT, FMT = 99999 )
* Skip the heading in the data file and read the data.
READ ( NIN, FMT = '()' )
* Read N, TOL and next A (row wise).
READ ( NIN, FMT = * ) N, TOL
IF ( N.LT.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99995 ) N
ELSE
DO 10 I = 1, N
READ ( NIN, FMT = * ) ( A(I,J), J = 1, N )
10 CONTINUE
*
WRITE ( NOUT, FMT = 99998 ) N, TOL
CALL UD01MD( N, N, 5, NOUT, A, LDA, 'A', INFO )
*
CALL AB13FD( N, A, LDA, BETA, OMEGA, TOL, DWORK, LDWORK, CWORK,
$ LCWORK, INFO )
*
IF ( INFO.NE.0 )
$ WRITE ( NOUT, FMT = 99996 ) INFO
WRITE ( NOUT, FMT = 99997 ) BETA, OMEGA
END IF
*
99999 FORMAT (' AB13FD EXAMPLE PROGRAM RESULTS', /1X)
99998 FORMAT (' N =', I2, 3X, 'TOL =', D10.3)
99997 FORMAT (' Stability radius :', D18.11, /
* ' Minimizing omega :', D18.11)
99996 FORMAT (' INFO on exit from AB13FD = ', I2)
99995 FORMAT (/' N is out of range.',/' N = ',I5)
END
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