PROGRAM f04affe ! F04AFF Example Program Text ! Mark 23 Release. NAG Copyright 2011. ! .. Use Statements .. USE nag_library, ONLY : f03aef, f04aff, nag_wp, x02ajf ! .. Implicit None Statement .. IMPLICIT NONE ! .. Parameters .. INTEGER, PARAMETER :: nin = 5, nout = 6 ! .. Local Scalars .. REAL (KIND=nag_wp) :: d1, eps INTEGER :: i, id, ifail, ir, k, lda, ldb, ldbb, & ldx, n ! .. Local Arrays .. REAL (KIND=nag_wp), ALLOCATABLE :: a(:,:), b(:,:), bb(:,:), p(:), x(:,:) ! .. Executable Statements .. WRITE (nout,*) 'F04AFF Example Program Results' WRITE (nout,*) ! Skip heading in data file READ (nin,*) READ (nin,*) n ir = 1 lda = n ldb = n ldbb = n ldx = n ALLOCATE (a(lda,n),b(ldb,ir),bb(ldbb,ir),p(n),x(ldx,ir)) READ (nin,*) (a(i,1:n),i=1,n) ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 ! Cholesky decomposition CALL f03aef(n,a,lda,p,d1,id,ifail) READ (nin,*) (b(i,1:ir),i=1,n) eps = x02ajf() ifail = 0 ! Accurate solution of linear equations CALL f04aff(n,ir,a,lda,p,b,ldb,eps,x,ldx,bb,ldbb,k,ifail) WRITE (nout,*) ' Solution' DO i = 1, n WRITE (nout,99999) x(i,1:ir) END DO 99999 FORMAT (1X,8F9.4) END PROGRAM f04affe