Program g13cdfe

!     G13CDF Example Program Text

!     Mark 27.3 Release. NAG Copyright 2021.

!     .. Use Statements ..
      Use nag_library, Only: g13cdf, nag_wp
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
      Real (Kind=nag_wp)               :: pw, pxy
      Integer                          :: ifail, ish, j, kc, l, m, mtxy, mw,   &
                                          ng, nxy
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: xg(:), yg(:)
!     .. Intrinsic Procedures ..
      Intrinsic                        :: ceiling, log, real
!     .. Executable Statements ..
      Write (nout,*) 'G13CDF Example Program Results'
      Write (nout,*)

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

!     Read in the problem size
      Read (nin,*) nxy, l

!     Read in control parameters
      Read (nin,*) mtxy, pxy, pw, mw, ish

!     Get a value for KC
      m = ceiling(log(2.0E0_nag_wp*real(nxy,kind=nag_wp)/real(l,               &
        kind=nag_wp))/log(2.0E0_nag_wp))
      kc = (2**m)*l
      Allocate (xg(kc),yg(kc))

!     Read in data
      Read (nin,*) xg(1:nxy)
      Read (nin,*) yg(1:nxy)

      ifail = 0
      Call g13cdf(nxy,mtxy,pxy,mw,ish,pw,l,kc,xg,yg,ng,ifail)

!     Display results
      Write (nout,*) '                      Returned sample spectrum'
      Write (nout,*)
      Write (nout,*)                                                           &
        '      Real  Imaginary       Real  Imaginary       Real  Imaginary'
      Write (nout,*)                                                           &
        '      part     part         part     part         part     part'
      Write (nout,99999)(j,xg(j),yg(j),j=1,ng)

99999 Format (1X,I3,F8.4,F9.4,I5,F8.4,F9.4,I5,F8.4,F9.4)
    End Program g13cdfe