*     F11XAF Example Program Text
*     Mark 20 Revised. NAG Copyright 2001.
*     .. Parameters ..
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
      INTEGER          LA, NMAX
      PARAMETER        (LA=10000,NMAX=1000)
*     .. Local Scalars ..
      INTEGER          I, IFAIL, N, NNZ
      CHARACTER        CHECK, TRANS
*     .. Local Arrays ..
      DOUBLE PRECISION A(LA), X(NMAX), Y(NMAX)
      INTEGER          ICOL(LA), IROW(LA)
*     .. External Subroutines ..
      EXTERNAL         F11XAF
*     .. Executable Statements ..
      WRITE (NOUT,*) 'F11XAF Example Program Results'
*     Skip heading in data file
      READ (NIN,*)
*
*     Read order of matrix and number of non-zero entries
*
      READ (NIN,*) N
      IF (N.LE.NMAX) THEN
         READ (NIN,*) NNZ
*
*        Read the matrix A
*
         DO 20 I = 1, NNZ
            READ (NIN,*) A(I), IROW(I), ICOL(I)
   20    CONTINUE
*
*        Read the vector x
*
         READ (NIN,*) (X(I),I=1,N)
*
*        Calculate matrix-vector product
*
         TRANS = 'N'
         CHECK = 'C'
         IFAIL = 0
         CALL F11XAF(TRANS,N,NNZ,A,IROW,ICOL,CHECK,X,Y,IFAIL)
*
*        Output results
*
         WRITE (NOUT,*)
         WRITE (NOUT,*) ' Matrix-vector product'
         DO 40 I = 1, N
            WRITE (NOUT,'(D16.4)') Y(I)
   40    CONTINUE
*
*        Calculate transposed matrix-vector product
*
         TRANS = 'T'
         CHECK = 'N'
         IFAIL = 0
         CALL F11XAF(TRANS,N,NNZ,A,IROW,ICOL,CHECK,X,Y,IFAIL)
*
*        Output results
*
         WRITE (NOUT,*)
         WRITE (NOUT,*) ' Transposed matrix-vector product'
         DO 60 I = 1, N
            WRITE (NOUT,'(D16.4)') Y(I)
   60    CONTINUE
*
      END IF
      STOP
      END