Program g13dlfe

!     G13DLF Example Program Text

!     Mark 27.2 Release. NAG Copyright 2021.

!     .. Use Statements ..
      Use nag_library, Only: g13dlf, nag_wp
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
      Integer                          :: d, i, ifail, k, kmax, n, nd, tddelta
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: delta(:,:), w(:,:), work(:), z(:,:)
      Integer, Allocatable             :: id(:)
      Character (1), Allocatable       :: tr(:)
!     .. Intrinsic Procedures ..
      Intrinsic                        :: max, maxval
!     .. Executable Statements ..
      Write (nout,*) 'G13DLF Example Program Results'
      Write (nout,*)

!     Skip heading in data file
      Read (nin,*)

!     Read in problem size
      Read (nin,*) k, n

      Allocate (id(k))

!     Read in differencing
      Read (nin,*) id(1:k)

      d = maxval(id(1:k))
      tddelta = max(d,1)
      nd = n - d
      kmax = k
      Allocate (z(kmax,n),tr(k),delta(kmax,tddelta),w(kmax,nd),work(k*n))

!     Read in series and the transformation flag
      Read (nin,*)(z(i,1:n),i=1,k)
      Read (nin,*) tr(1:k)

!     If required, read in delta
      If (d>0) Then
        Read (nin,*)(delta(i,1:id(i)),i=1,k)
      End If

!     Difference and / or transform series
      ifail = 0
      Call g13dlf(k,n,z,kmax,tr,id,delta,w,nd,work,ifail)

!     Display results
      Write (nout,*) ' Transformed/Differenced series'
      Write (nout,*) ' ------------------------------'
      Do i = 1, k
        Write (nout,*)
        Write (nout,99999) ' Series ', i
        Write (nout,*) ' -----------'
        Write (nout,*)
        Write (nout,99998) ' Number of differenced values = ', nd
        Write (nout,*)
        Write (nout,99997) w(i,1:nd)
      End Do

99999 Format (1X,A,I2)
99998 Format (1X,A,I6)
99997 Format (1X,8F9.3)
    End Program g13dlfe