Program c06pcfe
! C06PCF Example Program Text
! Mark 30.1 Release. NAG Copyright 2024.
! .. Use Statements ..
Use nag_library, Only: c06pcf, nag_wp
! .. Implicit None Statement ..
Implicit None
! .. Parameters ..
Integer, Parameter :: nin = 5, nout = 6
! .. Local Scalars ..
Integer :: ieof, ifail, j, n
! .. Local Arrays ..
Complex (Kind=nag_wp), Allocatable :: work(:), x(:), xx(:)
! .. Executable Statements ..
Write (nout,*) 'C06PCF Example Program Results'
! Skip heading in data file
Read (nin,*)
loop: Do
Read (nin,*,Iostat=ieof) n
If (ieof<0) Then
Exit loop
End If
Allocate (work(2*n+15),x(0:n-1),xx(0:n-1))
Read (nin,*) x(0:n-1)
xx(0:n-1) = x(0:n-1)
! ifail: behaviour on error exit
! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft
ifail = 0
Call c06pcf('F',x,n,work,ifail)
Write (nout,*)
Write (nout,*) 'Components of discrete Fourier transform'
Write (nout,*)
Write (nout,*) ' Real Imag'
Write (nout,*)
Do j = 0, n - 1
Write (nout,99999) j, x(j)
End Do
Call c06pcf('B',x,n,work,ifail)
Write (nout,*)
Write (nout,*) 'Original sequence as restored by inverse transform'
Write (nout,*)
Write (nout,*) ' Original Restored'
Write (nout,*) ' Real Imag Real Imag'
Write (nout,*)
Do j = 0, n - 1
Write (nout,99999) j, xx(j), x(j)
End Do
Deallocate (work,x,xx)
End Do loop
99999 Format (1X,I5,2(:,5X,'(',F8.5,',',F8.5,')'))
End Program c06pcfe