*     F04YAF Example Program Text
*     Mark 14 Revised. NAG Copyright 1989.
*     .. Parameters ..
      INTEGER          PMAX, LDA, LWORK
      PARAMETER        (PMAX=10,LDA=PMAX,LWORK=4*PMAX)
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
*     .. Local Scalars ..
      DOUBLE PRECISION SIGMA, TOL
      INTEGER          I, IFAIL, IRANK, J, JOB, N, P
      LOGICAL          SVD
*     .. Local Arrays ..
      DOUBLE PRECISION A(LDA,PMAX), CJ(PMAX), WORK(LWORK), Y(PMAX)
*     .. External Subroutines ..
      EXTERNAL         F04JGF, F04YAF
*     .. Executable Statements ..
      WRITE (NOUT,*) 'F04YAF Example Program Results'
*     Skip heading in data file
      READ (NIN,*)
      READ (NIN,*) N, P
      TOL = 5.0D-4
      IF (N.GT.0 .AND. N.LE.LDA .AND. P.GT.0 .AND. P.LE.PMAX) THEN
         READ (NIN,*) ((A(I,J),J=1,P),I=1,N)
         READ (NIN,*) (Y(I),I=1,N)
*
         IFAIL = 1
         CALL F04JGF(N,P,A,LDA,Y,TOL,SVD,SIGMA,IRANK,WORK,LWORK,IFAIL)
*
         WRITE (NOUT,*)
         IF (IFAIL.EQ.0) THEN
            WRITE (NOUT,99999) 'SIGMA =', SIGMA, '  Rank =', IRANK,
     +        '  SVD =', SVD
            WRITE (NOUT,*)
            WRITE (NOUT,*) 'Solution vector'
            WRITE (NOUT,99998) (Y(I),I=1,P)
            JOB = 0
            IFAIL = 1
*
            CALL F04YAF(JOB,P,SIGMA,A,LDA,SVD,IRANK,WORK,CJ,WORK(P+1),
     +                  IFAIL)
*
            IF (IFAIL.EQ.0) THEN
               WRITE (NOUT,*)
               WRITE (NOUT,*)
     +           'Estimated variances of regression coefficients'
               WRITE (NOUT,99998) (CJ(J),J=1,P)
            ELSE
               WRITE (NOUT,99997) IFAIL
            END IF
         ELSE
            WRITE (NOUT,99996) IFAIL
         END IF
      END IF
*
99999 FORMAT (1X,A,F9.4,A,I3,A,L3)
99998 FORMAT (1X,7F9.4)
99997 FORMAT (1X,' ** F04YAF returned with IFAIL = ',I5)
99996 FORMAT (1X,' ** F04JGF returned with IFAIL = ',I5)
      END