Program f04ahfe ! F04AHF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: f03aff, f04ahf, 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, ldaa, ldb, & ldbb, ldx, n ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: a(:,:), aa(:,:), b(:,:), bb(:,:), & p(:), x(:,:) ! .. Executable Statements .. Write (nout,*) 'F04AHF Example Program Results' Write (nout,*) ! Skip heading in data file Read (nin,*) Read (nin,*) n ir = 1 lda = n ldaa = n ldb = n ldbb = n ldx = n Allocate (a(lda,n),aa(ldaa,n),b(ldb,ir),bb(ldbb,ir),p(n),x(ldx,ir)) Read (nin,*)(aa(i,1:n),i=1,n) a(1:n,1:n) = aa(1:n,1:n) ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 ! Crout decomposition Call f03aff(n,eps,aa,ldaa,d1,id,p,ifail) Read (nin,*)(b(i,1:ir),i=1,n) eps = x02ajf() ifail = 0 ! Accurate solution of linear equations Call f04ahf(n,ir,a,lda,aa,ldaa,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 f04ahfe