Program c06ecfe ! C06ECF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: c06ecf, c06gcf, nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: ieof, ifail, j, n ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: x(:), xx(:), y(:), yy(:) ! .. Executable Statements .. Write (nout,*) 'C06ECF Example Program Results' ! Skip heading in data file Read (nin,*) loop: Do Read (nin,*,Iostat=ieof) n If (ieof<0) Exit loop Allocate (x(0:n-1),xx(0:n-1),y(0:n-1),yy(0:n-1)) Read (nin,*)(x(j),y(j),j=0,n-1) xx(0:n-1) = x(0:n-1) yy(0:n-1) = y(0:n-1) ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 Call c06ecf(x,y,n,ifail) Write (nout,*) Write (nout,*) 'Components of discrete Fourier transform' Write (nout,*) Write (nout,*) ' Real Imag' Write (nout,*) Write (nout,99999)(j,x(j),y(j),j=0,n-1) Call c06gcf(y,n,ifail) Call c06ecf(x,y,n,ifail) Call c06gcf(y,n,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,*) Write (nout,99998)(j,xx(j),yy(j),x(j),y(j),j=0,n-1) Deallocate (x,xx,y,yy) End Do loop 99999 Format (1X,I5,2F10.5) 99998 Format (1X,I5,2F10.5,5X,2F10.5) End Program c06ecfe