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function [g,L,info] = nonsepgabpars_from_window(g,a,M,lt,L,callfun)
%-*- texinfo -*-
%@deftypefn {Function} nonsepgabpars_from_window
%@verbatim
%NONSEPGABPARS_FROM_WINDOW Compute g and L from window
% Usage: [g,g.info,L] = gabpars_from_window(f,g,a,M,lt,L);
%
% Use this function if you know a window and a lattice
% for the NONSEPDGT. The function will calculate a transform length L and
% evaluate the window g into numerical form.
%
% If the transform length is unknown (as it usually is unless explicitly
% specified by the user), set L to be [] in the input to this function.
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/nonsepgabpars_from_window.html}
%@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/>.
if nargin<6
stacknames=dbstack;
callfun=stacknames(2).name;
end;
if isempty(L)
if isnumeric(g)
L=length(g);
else
L=dgtlength(1,a,M,lt);
end;
else
Lcheck=dgtlength(L,a,M,lt);
if Lcheck~=L
error('%s: Invalid transform size L',upper(mfilename));
end;
end;
[g,info] = comp_window(g,a,M,L,lt,'NONSEPGABDUAL');
if (info.isfir)
if info.istight
g=g/sqrt(2);
end;
end;
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