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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
function gd=comp_gabdual_long(g,a,M);
%-*- texinfo -*-
%@deftypefn {Function} comp_gabdual_long
%@verbatim
%COMP_GABDUAL_LONG Compute dual window
%
% This is a computational subroutine, do not call it directly, use
% GABDUAL instead.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_gabdual_long.html}
%@seealso{gabdual}
%@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/>.
L=length(g);
R=size(g,2);
gf=comp_wfac(g,a,M);
b=L/M;
N=L/a;
c=gcd(a,M);
d=gcd(b,N);
p=b/d;
q=N/d;
gdf=zeros(p*q*R,c*d,assert_classname(g));
G=zeros(p,q*R,assert_classname(g));
for ii=1:c*d
% This essentially computes pinv of each block.
G(:)=gf(:,ii);
S=G*G';
Gpinv=(S\G);
gdf(:,ii)=Gpinv(:);
end;
gd=comp_iwfac(gdf,L,a,M);
if isreal(g)
gd=real(gd);
end;
|
