* F04AFF Example Program Text * Mark 14 Revised. NAG Copyright 1989. * .. Parameters .. INTEGER NMAX, IR, LDA, LDB, LDX, LDBB PARAMETER (NMAX=8,IR=1,LDA=NMAX,LDB=NMAX,LDX=NMAX, + LDBB=NMAX) INTEGER NIN, NOUT PARAMETER (NIN=5,NOUT=6) * .. Local Scalars .. DOUBLE PRECISION D1, EPS INTEGER I, ID, IFAIL, J, K, N * .. Local Arrays .. DOUBLE PRECISION A(LDA,NMAX), B(LDB,IR), BB(LDBB,IR), P(NMAX), + X(LDX,IR) * .. External Functions .. DOUBLE PRECISION X02AJF EXTERNAL X02AJF * .. External Subroutines .. EXTERNAL F03AEF, F04AFF * .. Executable Statements .. WRITE (NOUT,*) 'F04AFF Example Program Results' * Skip heading in data file READ (NIN,*) READ (NIN,*) N WRITE (NOUT,*) IF (N.GT.0 .AND. N.LE.NMAX) THEN READ (NIN,*) ((A(I,J),J=1,N),I=1,N) IFAIL = 1 * * Cholesky decomposition CALL F03AEF(N,A,LDA,P,D1,ID,IFAIL) * IF (IFAIL.EQ.0) THEN READ (NIN,*) ((B(I,J),J=1,IR),I=1,N) EPS = X02AJF() IFAIL = 1 * * Accurate solution of linear equations CALL F04AFF(N,IR,A,LDA,P,B,LDB,EPS,X,LDX,BB,LDBB,K,IFAIL) * IF (IFAIL.EQ.0) THEN WRITE (NOUT,*) ' Solution' DO 20 I = 1, N WRITE (NOUT,99998) (X(I,J),J=1,IR) 20 CONTINUE ELSE WRITE (NOUT,99997) IFAIL END IF ELSE WRITE (NOUT,99996) IFAIL END IF ELSE WRITE (NOUT,99999) 'N is out of range: N = ', N END IF * 99999 FORMAT (1X,A,I5) 99998 FORMAT (1X,8F9.4) 99997 FORMAT (1X,' ** F04AFF returned with IFAIL = ',I5) 99996 FORMAT (1X,' ** F03AEF returned with IFAIL = ',I5) END