?? logsum.m
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function y=logsum(x,d)
%LOGSUM logsum(x,d)=log(sum(exp(x),d))
% d gives dimension to sum along
% Copyright (C) Mike Brookes 1998
%
% Last modified Mon Oct 12 15:47:25 1998
%
% VOICEBOX is a MATLAB toolbox for speech processing. Home page is at
% http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 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 2 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 can obtain a copy of the GNU General Public License from
% ftp://prep.ai.mit.edu/pub/gnu/COPYING-2.0 or by writing to
% Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if nargin==1
d=[find(size(x)-1) 1];
d=d(1);
end
n=size(x,d);
if n<=1, y=x; return; end
s=size(x);
p=[d:ndims(x) 1:d-1];
z=reshape(permute(x,p),n,prod(s)/n);
y=max(z);
y=y+log(sum(exp(z-y(ones(n,1),:))));
s(d)=1;
y=ipermute(reshape(y,s(p)),p);
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