! C06FXF Example Program Text ! Mark 24 Release. NAG Copyright 2012. Module c06fxfe_mod ! C06FXF Example Program Module: ! Parameters and User-defined Routines ! .. Use Statements .. Use nag_library, Only: nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 Contains Subroutine readxy(nin,x,y,n1,n2,n3) ! Read 3-dimensional complex data ! .. Scalar Arguments .. Integer, Intent (In) :: n1, n2, n3, nin ! .. Array Arguments .. Real (Kind=nag_wp), Intent (Out) :: x(n1,n2,n3), y(n1,n2,n3) ! .. Local Scalars .. Integer :: i, j, k ! .. Executable Statements .. Do i = 1, n1 Do j = 1, n2 Read (nin,*)(x(i,j,k),k=1,n3) Read (nin,*)(y(i,j,k),k=1,n3) End Do End Do Return End Subroutine readxy Subroutine writxy(nout,x,y,n1,n2,n3) ! Print 3-dimensional complex data ! .. Scalar Arguments .. Integer, Intent (In) :: n1, n2, n3, nout ! .. Array Arguments .. Real (Kind=nag_wp), Intent (In) :: x(n1,n2,n3), y(n1,n2,n3) ! .. Local Scalars .. Integer :: i, j, k ! .. Executable Statements .. Do i = 1, n1 Write (nout,*) Write (nout,99998) 'z(i,j,k) for i =', i Do j = 1, n2 Write (nout,*) Write (nout,99999) 'Real ', (x(i,j,k),k=1,n3) Write (nout,99999) 'Imag ', (y(i,j,k),k=1,n3) End Do End Do Return 99999 Format (1X,A,7F10.3/(6X,7F10.3)) 99998 Format (1X,A,I6) End Subroutine writxy End Module c06fxfe_mod Program c06fxfe ! C06FXF Example Main Program ! .. Use Statements .. Use nag_library, Only: c06fxf, c06gcf, nag_wp Use c06fxfe_mod, Only: nin, nout, readxy, writxy ! .. Implicit None Statement .. Implicit None ! .. Local Scalars .. Integer :: ieof, ifail, n, n1, n2, n3 ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: trign1(:), trign2(:), trign3(:), & work(:), x(:), y(:) ! .. Executable Statements .. Write (nout,*) 'C06FXF Example Program Results' ! Skip heading in data file Read (nin,*) loop: Do Read (nin,*,Iostat=ieof) n1, n2, n3 If (ieof<0) Exit loop n = n1*n2*n3 Allocate (trign1(2*n1),trign2(2*n2),trign3(2*n3),work(2*n),x(n),y(n)) Call readxy(nin,x,y,n1,n2,n3) Write (nout,*) Write (nout,*) 'Original data values' Call writxy(nout,x,y,n1,n2,n3) ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 ! -- Compute transform Call c06fxf(n1,n2,n3,x,y,'Initial',trign1,trign2,trign3,work,ifail) Write (nout,*) Write (nout,*) 'Components of discrete Fourier transform' Call writxy(nout,x,y,n1,n2,n3) ! -- Compute inverse transform Call c06gcf(y,n,ifail) Call c06fxf(n1,n2,n3,x,y,'Subsequent',trign1,trign2,trign3,work,ifail) Call c06gcf(y,n,ifail) Write (nout,*) Write (nout,*) 'Original sequence as restored by inverse transform' Call writxy(nout,x,y,n1,n2,n3) Deallocate (trign1,trign2,trign3,work,x,y) End Do loop End Program c06fxfe