*     F11JRF Example Program Text
*     Mark 22 Release. NAG Copyright 2008.
*     .. Parameters ..
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
      INTEGER          NMAX, LA
      PARAMETER        (NMAX=1000,LA=10000)
*     .. Local Scalars ..
      DOUBLE PRECISION OMEGA
      INTEGER          I, IFAIL, N, NNZ
      CHARACTER        CHECK
*     .. Local Arrays ..
      COMPLEX *16      A(LA), X(NMAX), Y(NMAX)
      DOUBLE PRECISION RDIAG(NMAX)
      INTEGER          ICOL(LA), IROW(LA), IWORK(NMAX+1)
*     .. External Subroutines ..
      EXTERNAL         F11JRF
*     .. Intrinsic Functions ..
      INTRINSIC        DBLE
*     .. Executable Statements ..
      WRITE (NOUT,*) 'F11JRF Example Program Results'
*     Skip heading in data file
      READ (NIN,*)
*
*     Read algorithmic parameters
*
      READ (NIN,*) N
      IF (N.LE.NMAX) THEN
         READ (NIN,*) NNZ
         READ (NIN,*) CHECK
         READ (NIN,*) OMEGA
*
*        Read the matrix A
*
         DO 20 I = 1, NNZ
            READ (NIN,*) A(I), IROW(I), ICOL(I)
   20    CONTINUE
*
*        Read rhs vector y
*
         READ (NIN,*) (Y(I),I=1,N)
*
*        Fill in the diagonal part
*
         DO 40 I = 1, NNZ
            IF (IROW(I).EQ.ICOL(I)) RDIAG(IROW(I)) = 1.D0/DBLE(A(I))
   40    CONTINUE
*
*
*        Solve Mx = b using F11JRF
*
         IFAIL = 1
         CALL F11JRF(N,NNZ,A,IROW,ICOL,RDIAG,OMEGA,CHECK,Y,X,IWORK,
     +               IFAIL)
*
         IF (IFAIL.EQ.0) THEN
*
*           Output x
*
            DO 60 I = 1, N
               WRITE (NOUT,99999) X(I)
   60       CONTINUE
         ELSE
            WRITE (NOUT,99998) IFAIL
         END IF
      END IF
*
99999 FORMAT (1X,'(',E16.4,',',E16.4,')')
99998 FORMAT (1X,/1X,' ** F11JRF returned with IFAIL = ',I5)
      END