Program c06rcfe
! C06RCF Example Program Text
! Mark 30.1 Release. NAG Copyright 2024.
! .. Use Statements ..
Use nag_library, Only: c06rcf, nag_wp
! .. Implicit None Statement ..
Implicit None
! .. Parameters ..
Integer, Parameter :: nin = 5, nout = 6
! .. Local Scalars ..
Integer :: i, ieof, ifail, j, m, n
! .. Local Arrays ..
Real (Kind=nag_wp), Allocatable :: work(:), x(:)
! .. Executable Statements ..
Write (nout,*) 'C06RCF Example Program Results'
! Skip heading in data file
Read (nin,*)
loop: Do
Read (nin,*,Iostat=ieof) m, n
If (ieof<0) Then
Exit loop
End If
Allocate (x(m*(n+2)),work(m*n+2*n+2*m+15))
Do j = 1, m
Read (nin,*)(x(i*m+j),i=0,n-1)
End Do
Write (nout,*)
Write (nout,*) 'Original data values'
Write (nout,*)
Do j = 1, m
Write (nout,99999)(x(i*m+j),i=0,n-1)
End Do
! ifail: behaviour on error exit
! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft
ifail = 0
! -- Compute transform
Call c06rcf('Forward',m,n,x,work,ifail)
Write (nout,*)
Write (nout,*) 'Discrete quarter-wave Fourier sine transforms'
Write (nout,*)
Do j = 1, m
Write (nout,99999)(x(i*m+j),i=0,n-1)
End Do
! -- Compute inverse transform
Call c06rcf('Backward',m,n,x,work,ifail)
Write (nout,*)
Write (nout,*) 'Original data as restored by inverse transform'
Write (nout,*)
Do j = 1, m
Write (nout,99999)(x(i*m+j),i=0,n-1)
End Do
Deallocate (x,work)
End Do loop
99999 Format (6X,7F10.4)
End Program c06rcfe