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* SB03OD EXAMPLE PROGRAM TEXT
*
* .. Parameters ..
DOUBLE PRECISION ZERO
PARAMETER ( ZERO = 0.0D0 )
INTEGER NIN, NOUT
PARAMETER ( NIN = 5, NOUT = 6 )
INTEGER NMAX, MMAX
PARAMETER ( NMAX = 20, MMAX = 20 )
INTEGER LDA, LDB, LDQ, LDX, LDWORK
PARAMETER ( LDA = NMAX, LDB = MAX( MMAX,NMAX ),
$ LDQ = NMAX, LDX = NMAX )
PARAMETER ( LDWORK = 4*NMAX+MIN(MMAX,NMAX) )
* .. Local Scalars ..
DOUBLE PRECISION SCALE, TEMP
INTEGER I, INFO, J, K, M, N
CHARACTER*1 DICO, FACT, TRANS
* .. Local Arrays ..
DOUBLE PRECISION A(LDA,NMAX), B(LDB,LDB), DWORK(LDWORK),
$ Q(LDQ,NMAX), WR(NMAX), WI(NMAX), X(LDX,NMAX)
* .. External Functions ..
LOGICAL LSAME
EXTERNAL LSAME
* .. External Subroutines ..
EXTERNAL SB03OD
* .. Intrinsic Functions ..
INTRINSIC MAX, MIN
* .. Executable Statements ..
*
WRITE ( NOUT, FMT = 99999 )
* Skip the heading in the data file and read the data.
READ ( NIN, FMT = '()' )
READ ( NIN, FMT = * ) N, M, DICO, FACT, TRANS
IF ( N.LT.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99994 ) N
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,N )
IF ( LSAME( FACT, 'F' ) ) READ ( NIN, FMT = * )
$ ( ( Q(I,J), J = 1,N ), I = 1,N )
IF ( M.LT.0 .OR. M.GT.MMAX ) THEN
WRITE ( NOUT, FMT = 99993 ) M
ELSE
IF ( LSAME( TRANS, 'N' ) ) THEN
READ ( NIN, FMT = * ) ( ( B(I,J), J = 1,N ), I = 1,M )
ELSE
READ ( NIN, FMT = * ) ( ( B(I,J), J = 1,M ), I = 1,N )
END IF
* Find the Cholesky factor U.
CALL SB03OD( DICO, FACT, TRANS, N, M, A, LDA, Q, LDQ, B,
$ LDB, SCALE, WR, WI, DWORK, LDWORK, INFO )
*
IF ( INFO.NE.0 ) THEN
WRITE ( NOUT, FMT = 99998 ) INFO
ELSE
WRITE ( NOUT, FMT = 99997 )
DO 20 J = 1, N
WRITE ( NOUT, FMT = 99996 ) ( B(I,J), I = 1,J )
20 CONTINUE
* Form the solution matrix X = op(U)'*op(U).
IF ( LSAME( TRANS, 'N' ) ) THEN
DO 80 I = 1, N
DO 60 J = I, N
TEMP = ZERO
DO 40 K = 1, I
TEMP = TEMP + B(K,I)*B(K,J)
40 CONTINUE
X(I,J) = TEMP
X(J,I) = TEMP
60 CONTINUE
80 CONTINUE
ELSE
DO 140 I = 1, N
DO 120 J = I, N
TEMP = ZERO
DO 100 K = J, N
TEMP = TEMP + B(I,K)*B(J,K)
100 CONTINUE
X(I,J) = TEMP
X(J,I) = TEMP
120 CONTINUE
140 CONTINUE
END IF
WRITE ( NOUT, FMT = 99995 )
DO 160 J = 1, N
WRITE ( NOUT, FMT = 99996 ) ( X(I,J), I = 1,N )
160 CONTINUE
WRITE ( NOUT, FMT = 99992 ) SCALE
END IF
END IF
END IF
STOP
*
99999 FORMAT (' SB03OD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from SB03OD = ',I2)
99997 FORMAT (' The transpose of the Cholesky factor U is ')
99996 FORMAT (20(1X,F8.4))
99995 FORMAT (/' The solution matrix X = op(U)''*op(U) is ')
99994 FORMAT (/' N is out of range.',/' N = ',I5)
99993 FORMAT (/' M is out of range.',/' M = ',I5)
99992 FORMAT (/' Scaling factor = ',F8.4)
END
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