Mercurial > hg > camir-aes2014
annotate toolboxes/FullBNT-1.0.7/KPMtools/logsum.m @ 0:e9a9cd732c1e tip
first hg version after svn
| author | wolffd |
|---|---|
| date | Tue, 10 Feb 2015 15:05:51 +0000 |
| parents | |
| children |
| rev | line source |
|---|---|
| wolffd@0 | 1 function y=logsum(x,d) |
| wolffd@0 | 2 %LOGSUM logsum(x,d)=log(sum(exp(x),d)) |
| wolffd@0 | 3 % d gives dimension to sum along |
| wolffd@0 | 4 |
| wolffd@0 | 5 % Copyright (C) Mike Brookes 1998 |
| wolffd@0 | 6 % |
| wolffd@0 | 7 % Last modified Mon Oct 12 15:47:25 1998 |
| wolffd@0 | 8 % |
| wolffd@0 | 9 % VOICEBOX is a MATLAB toolbox for speech processing. Home page is at |
| wolffd@0 | 10 % http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html |
| wolffd@0 | 11 % |
| wolffd@0 | 12 |
| wolffd@0 | 13 if nargin==1 |
| wolffd@0 | 14 d=[find(size(x)-1) 1]; |
| wolffd@0 | 15 d=d(1); |
| wolffd@0 | 16 end |
| wolffd@0 | 17 n=size(x,d); |
| wolffd@0 | 18 if n<=1, y=x; return; end |
| wolffd@0 | 19 s=size(x); |
| wolffd@0 | 20 p=[d:ndims(x) 1:d-1]; |
| wolffd@0 | 21 z=reshape(permute(x,p),n,prod(s)/n); |
| wolffd@0 | 22 |
| wolffd@0 | 23 y=max(z); |
| wolffd@0 | 24 y=y+log(sum(exp(z-y(ones(n,1),:)))); |
| wolffd@0 | 25 |
| wolffd@0 | 26 s(d)=1; |
| wolffd@0 | 27 y=ipermute(reshape(y,s(p)),p); |
| wolffd@0 | 28 |