Program f04affe ! F04AFF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. 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