dft.m

来自「linear time－frequency toolbox」· M 代码 · 共 28 行

function f=dft(f,N,dim);
%DFT   Normalized Discrete Fourier Transform
%   Usage: f=dft(f);
%          f=dft(f,N,dim);
%
%   This function computes a normalized discrete Fourier transform. This
%   is nothing but a scaled version of the output from FFT. The function
%   take exactly the same arguments as FFT. See the help on FFT for a
%   throurough description.
%
%   SEE ALSO:  IDFT

error(nargchk(1,3,nargin));

if nargin<3
  dim=1;
end;

if nargin==1
  N=size(f,1);
end;

if isempty(N)
  N=size(f,dim);
end;

f=fft(f,N,dim)/sqrt(N);