Program c06fbfe ! C06FBF 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 :: u(:), v(:), work(:), x(:), xx(:) ! .. Executable Statements .. Write (nout,*) 'C06FBF Example Program Results' ! Skip heading in data file Read (nin,*) loop: Do Read (nin,*,Iostat=ieof) n If (ieof<0) Exit loop Allocate (u(0:n-1),v(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) ! Convert x to separated real and imaginary parts for printing. ifail = 0 m = 1 Call c06gsf(m,n,x,u,v,ifail) ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 Call c06fbf(x,n,work,ifail) Write (nout,*) Write (nout,*) 'Original sequence and corresponding complex sequence' Write (nout,*) Write (nout,*) ' Data Real Imag' Write (nout,*) Write (nout,99999)(j,xx(j),' ',u(j),v(j),j=0,n-1) Write (nout,*) Write (nout,*) 'Components of discrete Fourier transform' Write (nout,*) Write (nout,99998)(j,x(j),j=0,n-1) Call c06faf(x,n,work,ifail) Call c06gbf(x,n,ifail) Write (nout,*) Write (nout,*) 'Original sequence as restored by inverse transform' Write (nout,*) Write (nout,*) ' Original Restored' Write (nout,*) Write (nout,99997)(j,xx(j),x(j),j=0,n-1) Deallocate (u,v,x,xx,work) End Do loop 99999 Format (1X,I5,F10.5,A,2F10.5) 99998 Format (1X,I5,F10.5) 99997 Format (1X,I5,2F10.5) End Program c06fbfe