PROGRAM f11jnfe ! F11JNF Example Program Text ! Mark 23 Release. NAG Copyright 2011. ! .. Use Statements .. USE nag_library, ONLY : f11jnf, nag_wp ! .. Implicit None Statement .. IMPLICIT NONE ! .. Parameters .. INTEGER, PARAMETER :: nin = 5, nout = 6 ! .. Local Scalars .. REAL (KIND=nag_wp) :: dscale, dtol INTEGER :: i, ifail, la, lfill, liwork, n, nnz, & nnzc, npivm CHARACTER (1) :: mic, pstrat ! .. Local Arrays .. COMPLEX (KIND=nag_wp), ALLOCATABLE :: a(:) INTEGER, ALLOCATABLE :: icol(:), ipiv(:), irow(:), istr(:), & iwork(:) ! .. Executable Statements .. WRITE (nout,*) 'F11JNF 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 ALLOCATE (a(la),icol(la),ipiv(n),irow(la),istr(n+1),iwork(liwork)) READ (nin,*) lfill, dtol READ (nin,*) mic, dscale READ (nin,*) pstrat ! Read the matrix A DO i = 1, nnz READ (nin,*) a(i), irow(i), icol(i) END DO ! 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) ! Output original matrix WRITE (nout,*) ' Original Matrix' WRITE (nout,99997) 'N =', n WRITE (nout,99997) 'NNZ =', nnz DO i = 1, nnz WRITE (nout,99999) i, a(i), irow(i), icol(i) END DO WRITE (nout,*) ! Output details of the factorization WRITE (nout,*) ' Factorization' WRITE (nout,99997) 'N =', n WRITE (nout,99997) 'NNZ =', nnzc WRITE (nout,99997) 'NPIVM =', npivm DO i = nnz + 1, nnz + nnzc WRITE (nout,99999) i, a(i), irow(i), icol(i) END DO WRITE (nout,*) WRITE (nout,*) ' I IPIV(I)' DO i = 1, n WRITE (nout,99998) i, ipiv(i) END DO 99999 FORMAT (I8,5X,'(',E16.4,',',E16.4,')',2I8) 99998 FORMAT (1X,2I8) 99997 FORMAT (1X,A,I16) END PROGRAM f11jnfe