PROGRAM f11mffe ! F11MFF Example Program Text ! Mark 23 Release. NAG Copyright 2011. ! .. Use Statements .. USE nag_library, ONLY : f11mdf, f11mef, f11mff, nag_wp, x04caf ! .. Implicit None Statement .. IMPLICIT NONE ! .. Parameters .. REAL (KIND=nag_wp), PARAMETER :: one = 1.E0_nag_wp INTEGER, PARAMETER :: nin = 5, nout = 6 ! .. Local Scalars .. REAL (KIND=nag_wp) :: flop, thresh INTEGER :: i, ifail, j, ldb, n, nnz, nnzl, & nnzu, nrhs, nzlmx, nzlumx, nzumx CHARACTER (1) :: spec, trans ! .. Local Arrays .. REAL (KIND=nag_wp), ALLOCATABLE :: a(:), b(:,:), lval(:), uval(:) INTEGER, ALLOCATABLE :: icolzp(:), il(:), iprm(:), & irowix(:), iu(:) ! .. Executable Statements .. WRITE (nout,*) 'F11MFF Example Program Results' FLUSH (nout) ! Skip heading in data file READ (nin,*) ! Read order of matrix and number of right hand sides READ (nin,*) n, nrhs ldb = n ALLOCATE (b(ldb,nrhs),icolzp(n+1),iprm(7*n)) ! Read the matrix A READ (nin,*) icolzp(1:n+1) nnz = icolzp(n+1) - 1 ALLOCATE (a(nnz),lval(8*nnz),uval(8*nnz),il(7*n+8*nnz+4),irowix(nnz), & iu(2*n+8*nnz+1)) DO i = 1, nnz READ (nin,*) a(i), irowix(i) END DO ! Read the right hand sides DO j = 1, nrhs READ (nin,*) b(1:n,j) END DO ! Calculate COLAMD permutation spec = 'M' ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 CALL f11mdf(spec,n,icolzp,irowix,iprm,ifail) ! Factorise thresh = one ifail = 0 nzlmx = 8*nnz nzlumx = 8*nnz nzumx = 8*nnz CALL f11mef(n,irowix,a,iprm,thresh,nzlmx,nzlumx,nzumx,il,lval,iu,uval, & nnzl,nnzu,flop,ifail) ! Solve trans = 'N' ifail = 0 CALL f11mff(trans,n,iprm,il,lval,iu,uval,nrhs,b,ldb,ifail) ! Output results WRITE (nout,*) FLUSH (nout) CALL x04caf('G',' ',n,nrhs,b,ldb,'Solutions',ifail) END PROGRAM f11mffe