1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
function coef=spreadfun(T)
%-*- texinfo -*-
%@deftypefn {Function} spreadfun
%@verbatim
%SPREADFUN Spreading function of a matrix
% Usage: c=spreadfun(T);
%
% SPREADFUN(T) computes the spreading function of the operator T,
% represented as a matrix. The spreading function represent the operator T*
% as a weighted sum of time-frequency shifts. See the help text for
% SPREADOP for the exact definition.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/operators/spreadfun.html}
%@seealso{spreadop, tconv, spreadinv, spreadadj}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.1
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
complainif_argnonotinrange(nargin,1,1,mfilename);
if ndims(T)>2 || size(T,1)~=size(T,2)
error('Input symbol T must be a square matrix.');
end;
L=size(T,1);
% The 'full' appearing on the next line is to guard the mex file.
coef=comp_col2diag(full(T));
coef=fft(coef)/L;
|
