Program c06fafe ! C06FAF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: c06faf, c06fbf, c06gbf, c06gsf, nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: ieof, ifail, j, m, n ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: a(:), b(:), work(:), x(:), xx(:) ! .. Executable Statements .. Write (nout,*) 'C06FAF Example Program Results' ! Skip heading in data file Read (nin,*) loop: Do Read (nin,*,Iostat=ieof) n If (ieof<0) Exit loop Allocate (a(0:n-1),b(0:n-1),x(0:n-1),xx(0:n-1),work(n)) 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 c06faf(x,n,work,ifail) Write (nout,*) Write (nout,*) 'Components of discrete Fourier transform' Write (nout,*) Write (nout,*) ' Real Imag' Write (nout,*) ! Convert x to separated real and imaginary parts for printing. ifail = 0 m = 1 Call c06gsf(m,n,x,a,b,ifail) Write (nout,99999)(j,a(j),b(j),j=0,n-1) Call c06gbf(x,n,ifail) Call c06fbf(x,n,work,ifail) Write (nout,*) Write (nout,*) 'Original sequence as restored by inverse transform' Write (nout,*) Write (nout,*) ' Original Restored' Write (nout,*) Write (nout,99999)(j,xx(j),x(j),j=0,n-1) Deallocate (a,b,x,xx,work) End Do loop 99999 Format (1X,I5,2F10.5) End Program c06fafe