Program f11jrfe ! F11JRF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: f11jrf, nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Real (Kind=nag_wp) :: omega Integer :: i, ifail, n, nnz Character (1) :: check ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: a(:), x(:), y(:) Real (Kind=nag_wp), Allocatable :: rdiag(:) Integer, Allocatable :: icol(:), irow(:), iwork(:) ! .. Intrinsic Procedures .. Intrinsic :: real ! .. Executable Statements .. Write (nout,*) 'F11JRF Example Program Results' ! Skip heading in data file Read (nin,*) ! Read algorithmic parameters Read (nin,*) n Read (nin,*) nnz Allocate (a(nnz),x(n),y(n),rdiag(n),icol(nnz),irow(nnz),iwork(n+1)) Read (nin,*) check Read (nin,*) omega ! Read the matrix A Do i = 1, nnz Read (nin,*) a(i), irow(i), icol(i) End Do ! Read rhs vector y Read (nin,*) y(1:n) ! Fill in the diagonal part Do i = 1, nnz If (irow(i)==icol(i)) rdiag(irow(i)) = 1.E0_nag_wp/real(a(i)) End Do ! Solve Mx = b using F11JRF ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 Call f11jrf(n,nnz,a,irow,icol,rdiag,omega,check,y,x,iwork,ifail) ! Output x Write (nout,99999) x(1:n) 99999 Format (1X,'(',E16.4,',',E16.4,')') End Program f11jrfe