*     F08CTF Example Program Text
*     Mark 21 Release. NAG Copyright 2004.
*     .. Parameters ..
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
      INTEGER          MMAX, NB, NMAX
      PARAMETER        (MMAX=8,NB=64,NMAX=8)
      INTEGER          LDA, LWORK
      PARAMETER        (LDA=MMAX,LWORK=NB*NMAX)
*     .. Local Scalars ..
      INTEGER          I, IFAIL, INFO, J, M, N
      CHARACTER*30     TITLE
*     .. Local Arrays ..
      COMPLEX *16      A(LDA,NMAX), TAU(NMAX), WORK(LWORK)
      CHARACTER        CLABS(1), RLABS(1)
*     .. External Subroutines ..
      EXTERNAL         X04DBF, ZGEQLF, ZUNGQL
*     .. Executable Statements ..
      WRITE (NOUT,*) 'F08CTF Example Program Results'
      WRITE (NOUT,*)
*     Skip heading in data file
      READ (NIN,*)
      READ (NIN,*) M, N
      IF (M.LE.MMAX .AND. N.LE.NMAX .AND. M.GE.N) THEN
*
*        Read A from data file
*
         READ (NIN,*) ((A(I,J),J=1,N),I=1,M)
*
*        Compute the QL factorization of A
*
         CALL ZGEQLF(M,N,A,LDA,TAU,WORK,LWORK,INFO)
*
*        Form the leading N columns of Q explicitly
*
         CALL ZUNGQL(M,N,N,A,LDA,TAU,WORK,LWORK,INFO)
*
*        Form the heading for X04DBF
*
         WRITE (TITLE,99999) N
*
*        Print the leading N columns of Q
*
         IFAIL = 0
         CALL X04DBF('General',' ',M,N,A,LDA,'Bracketed','F7.4',TITLE,
     +               'Integer',RLABS,'Integer',CLABS,80,0,IFAIL)
*
      ELSE
         WRITE (NOUT,*) 'MMAX and/or NMAX is too small, and/or M.LT.N'
      END IF
*
99999 FORMAT ('The leading ',I4,' columns of Q')
      END