Program f11jqfe ! F11JQF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: f11jnf, f11jqf, nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Real (Kind=nag_wp) :: dscale, dtol, rnorm, tol Integer :: i, ifail, itn, la, lfill, liwork, & lwork, maxitn, n, nnz, nnzc, npivm Character (6) :: method Character (1) :: mic, pstrat ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: a(:), b(:), work(:), x(:) Integer, Allocatable :: icol(:), ipiv(:), irow(:), istr(:), & iwork(:) ! .. Executable Statements .. Write (nout,*) 'F11JQF Example Program Results' ! Skip heading in data file Read (nin,*) ! Read algorithmic parameters Read (nin,*) n Read (nin,*) nnz la = 3*nnz liwork = 2*la + 7*n + 1 lwork = 7*n + 120 Allocate (a(la),b(n),work(lwork),x(n),icol(la),ipiv(n),irow(la), & istr(n+1),iwork(liwork)) Read (nin,*) method Read (nin,*) lfill, dtol Read (nin,*) mic, dscale Read (nin,*) pstrat Read (nin,*) tol, maxitn ! Read the matrix A Do i = 1, nnz Read (nin,*) a(i), irow(i), icol(i) End Do ! Read rhs vector b and initial approximate solution x Read (nin,*) b(1:n) Read (nin,*) x(1:n) ! Calculate incomplete Cholesky factorization ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 Call f11jnf(n,nnz,a,la,irow,icol,lfill,dtol,mic,dscale,pstrat,ipiv,istr, & nnzc,npivm,iwork,liwork,ifail) ! Solve Ax = b using F11JQF Call f11jqf(method,n,nnz,a,la,irow,icol,ipiv,istr,b,tol,maxitn,x,rnorm, & itn,work,lwork,ifail) Write (nout,99999) 'Converged in', itn, ' iterations' Write (nout,99998) 'Final residual norm =', rnorm ! Output x Write (nout,99997) x(1:n) 99999 Format (1X,A,I10,A) 99998 Format (1X,A,1P,E16.3) 99997 Format (1X,'(',E16.4,',',E16.4,')') End Program f11jqfe