*     F11DNF Example Program Text
*     Mark 19 Release. NAG Copyright 1999.
*     .. Parameters ..
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
      INTEGER          NMAX, LA, LIWORK
      PARAMETER        (NMAX=1000,LA=10000,LIWORK=7*NMAX+2)
*     .. Local Scalars ..
      DOUBLE PRECISION DTOL
      INTEGER          I, IFAIL, LFILL, N, NNZ, NNZC, NPIVM
      CHARACTER        MILU, PSTRAT
*     .. Local Arrays ..
      COMPLEX *16      A(LA)
      INTEGER          ICOL(LA), IDIAG(NMAX), IPIVP(NMAX), IPIVQ(NMAX),
     +                 IROW(LA), ISTR(NMAX+1), IWORK(LIWORK)
*     .. External Subroutines ..
      EXTERNAL         F11DNF
*     .. Executable Statements ..
      WRITE (NOUT,*) 'F11DNF Example Program Results'
      WRITE (NOUT,*)
*     Skip heading in data file
      READ (NIN,*)
*
*     Read algorithmic parameters
*
      READ (NIN,*) N
      IF (N.LE.NMAX) THEN
         READ (NIN,*) NNZ
         READ (NIN,*) LFILL, DTOL
         READ (NIN,*) PSTRAT
         READ (NIN,*) MILU
*
*        Read the matrix A
*
         DO 20 I = 1, NNZ
            READ (NIN,*) A(I), IROW(I), ICOL(I)
   20    CONTINUE
*
*        Calculate incomplete LU factorization
*
         IFAIL = 1
         CALL F11DNF(N,NNZ,A,LA,IROW,ICOL,LFILL,DTOL,PSTRAT,MILU,IPIVP,
     +               IPIVQ,ISTR,IDIAG,NNZC,NPIVM,IWORK,LIWORK,IFAIL)
         IF (IFAIL.EQ.0) THEN
*
*           Output original matrix
*
            WRITE (NOUT,*) ' Original Matrix'
            WRITE (NOUT,'(A,I4)') ' N     =', N
            WRITE (NOUT,'(A,I4)') ' NNZ   =', NNZ
            DO 40 I = 1, NNZ
               WRITE (NOUT,99999) I, A(I), IROW(I), ICOL(I)
   40       CONTINUE
            WRITE (NOUT,*)
*
*           Output details of the factorization
*
            WRITE (NOUT,*) ' Factorization'
            WRITE (NOUT,'(A,I4)') ' N     =', N
            WRITE (NOUT,'(A,I4)') ' NNZ   =', NNZC
            WRITE (NOUT,'(A,I4)') ' NPIVM =', NPIVM
            DO 60 I = NNZ + 1, NNZ + NNZC
               WRITE (NOUT,99999) I, A(I), IROW(I), ICOL(I)
   60       CONTINUE
            WRITE (NOUT,*)
*
            WRITE (NOUT,*) '        I       IPIVP(I)  IPIVQ(I)'
            DO 80 I = 1, N
               WRITE (NOUT,'(3I10)') I, IPIVP(I), IPIVQ(I)
   80       CONTINUE
         ELSE
            WRITE (NOUT,99998) IFAIL
         END IF
*
      END IF
*
99999 FORMAT (1X,I8,5X,'(',E16.4,',',E16.4,')',2I8)
99998 FORMAT (1X,/1X,' ** F11DNF returned with IFAIL = ',I5)
      END