! C06PUF Example Program Text ! Mark 24 Release. NAG Copyright 2012. Module c06pufe_mod ! C06PUF 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 readx(nin,x,n1,n2) ! Read 2-dimensional complex data ! .. Scalar Arguments .. Integer, Intent (In) :: n1, n2, nin ! .. Array Arguments .. Complex (Kind=nag_wp), Intent (Out) :: x(n1,n2) ! .. Local Scalars .. Integer :: i, j ! .. Executable Statements .. Do i = 1, n1 Read (nin,*)(x(i,j),j=1,n2) End Do Return End Subroutine readx Subroutine writx(nout,x,n1,n2) ! Print 2-dimensional complex data ! .. Scalar Arguments .. Integer, Intent (In) :: n1, n2, nout ! .. Array Arguments .. Complex (Kind=nag_wp), Intent (In) :: x(n1,n2) ! .. Local Scalars .. Integer :: i, j ! .. Intrinsic Procedures .. Intrinsic :: aimag, real ! .. Executable Statements .. Do i = 1, n1 Write (nout,*) Write (nout,99999) 'Real ', (real(x(i,j)),j=1,n2) Write (nout,99999) 'Imag ', (aimag(x(i,j)),j=1,n2) End Do Return 99999 Format (1X,A,7F10.3/(6X,7F10.3)) End Subroutine writx End Module c06pufe_mod Program c06pufe ! C06PUF Example Main Program ! .. Use Statements .. Use nag_library, Only: c06puf, nag_wp Use c06pufe_mod, Only: nin, nout, readx, writx ! .. Implicit None Statement .. Implicit None ! .. Local Scalars .. Integer :: ieof, ifail, m, n ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: work(:), x(:) ! .. Executable Statements .. Write (nout,*) 'C06PUF Example Program Results' ! Skip heading in data file Read (nin,*) loop: Do Read (nin,*,Iostat=ieof) m, n If (ieof<0) Exit loop Allocate (work(m*n+n+m+30),x(m*n)) Call readx(nin,x,m,n) Write (nout,*) Write (nout,*) 'Original data values' Call writx(nout,x,m,n) ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 ! -- Compute transform Call c06puf('F',m,n,x,work,ifail) Write (nout,*) Write (nout,*) 'Components of discrete Fourier transform' Call writx(nout,x,m,n) ! -- Compute inverse transform Call c06puf('B',m,n,x,work,ifail) Write (nout,*) Write (nout,*) 'Original sequence as restored by inverse transform' Call writx(nout,x,m,n) Deallocate (x,work) End Do loop End Program c06pufe