Program x04cffe

!     X04CFF Example Program Text

!     Mark 29.1 Release. NAG Copyright 2023.

!     .. Use Statements ..
      Use nag_library, Only: f01zcf, nag_wp, x04cff
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: n = 5, nout = 6
      Character (7), Parameter         :: clabs(n) = (/'Un     ','Deux   ',    &
                                          'Trois  ','Quatre ','Cinq   '/)
      Character (7), Parameter         :: rlabs(n) = (/'Uno    ','Due    ',    &
                                          'Tre    ','Quattro','Cinque '/)
!     .. Local Scalars ..
      Integer                          :: i, ifail, indent, j, kl, ku, ku_a,   &
                                          lda, ldab, m, ncols
      Character (1)                    :: job
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: a(:,:), ab(:,:)
!     .. Intrinsic Procedures ..
      Intrinsic                        :: max, min, real
!     .. Executable Statements ..
      Write (nout,*) 'X04CFF Example Program Results'

      Write (nout,*)
      Flush (nout)

!     Generate a square array of data.

      m = n
      kl = 1
      ku_a = 2

      lda = m
      Allocate (a(lda,n))

      Do j = 1, n

        Do i = max(1,j-ku_a), min(m,j+kl)
          a(i,j) = real(10*i+j,kind=nag_wp)
        End Do

      End Do

!     Convert a to packed storage, ignoring the second superdiagonal.

      ldab = kl + ku_a + 1
      Allocate (ab(ldab,n))

      ku = 1

      job = 'P'

      ifail = 0
      Call f01zcf(job,m,n,kl,ku,a,lda,ab,ldab,ifail)

      ncols = 80
      indent = 0

!     Print m by n band matrix with kl subdiagonals, 1 superdiagonal,
!     default format and integer row and column labels

      ifail = 0
      Call x04cff(m,n,kl,ku,ab,ldab,' ','Example 1:','Integer',rlabs,          &
        'Integer',clabs,ncols,indent,ifail)

      Write (nout,*)
      Flush (nout)

!     Convert the whole matrix a to packed storage.

      ku = ku_a

      job = 'P'

      ifail = 0
      Call f01zcf(job,m,n,kl,ku,a,lda,ab,ldab,ifail)

!     Print m by n band matrix with kl subdiagonals, ku superdiagonals,
!     user-supplied format and row and column labels

      ifail = 0
      Call x04cff(m,n,kl,ku,ab,ldab,'F8.2','Example 2:','Character',rlabs,     &
        'Character',clabs,ncols,indent,ifail)

      Write (nout,*)
      Flush (nout)

!     Print m by n band matrix with kl subdiagonals, ku superdiagonals,
!     in MATLAB format
!     Row and column labelling is ignored

      ifail = 0
      Call x04cff(m,n,kl,ku,ab,ldab,'MATLABF8.2','A',' ',rlabs,' ',clabs,      &
        ncols,indent,ifail)

    End Program x04cffe