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* MB02CD EXAMPLE PROGRAM TEXT
* Copyright (c) 2002-2010 NICONET e.V.
*
* .. Parameters ..
DOUBLE PRECISION ZERO
PARAMETER ( ZERO = 0.0D0 )
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER KMAX, NMAX
PARAMETER ( KMAX = 20, NMAX = 20 )
INTEGER LCS, LDG, LDL, LDR, LDT, LDWORK
PARAMETER ( LDG = 2*KMAX, LDL = NMAX*KMAX, LDR = NMAX*KMAX,
$ LDT = KMAX, LDWORK = ( NMAX - 1 )*KMAX )
PARAMETER ( LCS = 3*LDWORK )
* .. Local Scalars ..
INTEGER I, INFO, J, K, M, N
CHARACTER JOB, TYPET
* .. Local Arrays .. (Dimensioned for TYPET = 'R'.)
DOUBLE PRECISION CS(LCS), DWORK(LDWORK), G(LDG, NMAX*KMAX),
$ L(LDL, NMAX*KMAX), R(LDR, NMAX*KMAX),
$ T(LDT, NMAX*KMAX)
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL DLASET, MB02CD
*
* .. Executable Statements ..
WRITE ( NOUT, FMT = 99999 )
* Skip the heading in the data file and read the data.
READ ( NIN, FMT = '()' )
READ ( NIN, FMT = * ) N, K, JOB
TYPET = 'R'
M = N*K
IF( N.LE.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99993 ) N
ELSE
IF( K.LE.0 .OR. K.GT.KMAX ) THEN
WRITE ( NOUT, FMT = 99992 ) K
ELSE
READ ( NIN, FMT = * ) ( ( T(I,J), J = 1,M ), I = 1,K )
* Compute the Cholesky factor(s) and/or the generator.
CALL MB02CD( JOB, TYPET, K, N, T, LDT, G, LDG, R, LDR, L,
$ LDL, CS, LCS, DWORK, LDWORK, INFO )
IF ( INFO.NE.0 ) THEN
WRITE ( NOUT, FMT = 99998 ) INFO
ELSE
IF ( LSAME( JOB, 'G' ) .OR. LSAME( JOB, 'A' ) .OR.
$ LSAME( JOB, 'L' ) .OR. LSAME( JOB, 'R' ) ) THEN
WRITE ( NOUT, FMT = 99997 )
CALL DLASET( 'Full', K, K, ZERO, ZERO, G(K+1,1), LDG )
DO 10 I = 1, 2*K
WRITE ( NOUT, FMT = 99994 ) ( G(I,J), J = 1, M )
10 CONTINUE
END IF
IF ( LSAME( JOB, 'L' ) .OR. LSAME( JOB, 'A' ) ) THEN
WRITE ( NOUT, FMT = 99996 )
DO 20 I = 1, M
WRITE ( NOUT, FMT = 99994 ) ( L(I,J), J = 1, M )
20 CONTINUE
END IF
IF ( LSAME( JOB, 'R' ) .OR. LSAME( JOB, 'A' )
$ .OR. LSAME( JOB, 'O' ) ) THEN
WRITE ( NOUT, FMT = 99995 )
DO 30 I = 1, M
WRITE ( NOUT, FMT = 99994 ) ( R(I,J), J = 1, M )
30 CONTINUE
END IF
END IF
END IF
END IF
STOP
*
99999 FORMAT (' MB02CD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from MB02CD = ',I2)
99997 FORMAT (' The generator of the inverse of block Toeplitz matrix',
$ ' is ')
99996 FORMAT (/' The lower Cholesky factor of the inverse is ')
99995 FORMAT (/' The upper Cholesky factor of block Toeplitz matrix is '
$ )
99994 FORMAT (20(1X,F8.4))
99993 FORMAT (/' N is out of range.',/' N = ',I5)
99992 FORMAT (/' K is out of range.',/' K = ',I5)
END
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