comparison toolboxes/FullBNT-1.0.7/KPMstats/standardize.m @ 0:e9a9cd732c1e tip

first hg version after svn

+function [S, mu, sigma2] = standardize(M, mu, sigma2)
+% function S = standardize(M, mu, sigma2)
+% Make each column of M be zero mean, std 1.
+% Thus each row is scaled separately.
+%
+% If mu, sigma2 are omitted, they are computed from M
+
+M = double(M);
+if nargin < 2
+  mu = mean(M,2);
+  sigma2 = std(M,0,2);
+  sigma2 = sigma2 + eps*(sigma2==0);
+end
+
+[nrows ncols] = size(M);
+S = M - repmat(mu(:), [1 ncols]);
+S = S ./ repmat(sigma2, [1 ncols]);
+