Mercurial > hg > camir-aes2014
diff toolboxes/FullBNT-1.0.7/KPMstats/histCmpChi2.m @ 0:e9a9cd732c1e tip
first hg version after svn
| author | wolffd |
|---|---|
| date | Tue, 10 Feb 2015 15:05:51 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toolboxes/FullBNT-1.0.7/KPMstats/histCmpChi2.m Tue Feb 10 15:05:51 2015 +0000 @@ -0,0 +1,15 @@ +function d = histCmpChi2(h1, h2) +% Compare two histograms using chi-squared +% function d = histCmpChi2(h1, h2) +% +% d(i,j) = chi^2(h1(i,:), h2(j,:)) = sum_b (h1(i,b)-h2(j,b)^2 / (h1(i,b) + h2(j,b)) + +[N B] = size(h1); +d = zeros(N,N); +for i=1:N + h1i = repmat(h1(i,:), N, 1); + numer = (h1i - h2).^2; + denom = h1i + h2 + eps; % if denom=0, then numer=0 + d(i,:) = sum(numer ./ denom, 2); +end +