FFT2D(3)

NAME

     fft2d:  Function to perform a two-dimensional FFT on a  two-
     dimensional array of real data.

Syntax

     #include <stdio.h>
     #include <math.h>
     void fft2d ( rows,  columns, data_real, data_imag);
     int rows,  columns;
     float * data_real, * data_imag;

DESCRIPTION

     The function arguments are two  pointers  to  float  arrays.
     data_real  is  a  pointer  to a rank-two array of input real
     data.  The real part of the transformed data are accessed by
     the  same  pointer.   The  imaginary  part  is referenced by
     data_imag.

     The forward transform is performed.

     The number of elements in each row and the  number  of  rows
     must be powers of 2.

BUGS

     The function has been tested only in another directory.

HISTORY

     1993-09-30   lyle bacon
     1994-02-08     SOI Version 0.8