Mercurial > hg > camir-aes2014
annotate toolboxes/FullBNT-1.0.7/KPMstats/standardize.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 [S, mu, sigma2] = standardize(M, mu, sigma2) |
| wolffd@0 | 2 % function S = standardize(M, mu, sigma2) |
| wolffd@0 | 3 % Make each column of M be zero mean, std 1. |
| wolffd@0 | 4 % Thus each row is scaled separately. |
| wolffd@0 | 5 % |
| wolffd@0 | 6 % If mu, sigma2 are omitted, they are computed from M |
| wolffd@0 | 7 |
| wolffd@0 | 8 M = double(M); |
| wolffd@0 | 9 if nargin < 2 |
| wolffd@0 | 10 mu = mean(M,2); |
| wolffd@0 | 11 sigma2 = std(M,0,2); |
| wolffd@0 | 12 sigma2 = sigma2 + eps*(sigma2==0); |
| wolffd@0 | 13 end |
| wolffd@0 | 14 |
| wolffd@0 | 15 [nrows ncols] = size(M); |
| wolffd@0 | 16 S = M - repmat(mu(:), [1 ncols]); |
| wolffd@0 | 17 S = S ./ repmat(sigma2, [1 ncols]); |
| wolffd@0 | 18 |