added zscore for those without statistics toolbox. Fixes rasmusbergpalm#23. Thanks @summerstay and @gallamine

rasmusbergpalm · rasmusbergpalm · commit c8d665d14a83 · 2013-03-07T20:33:41.000+01:00
diff --git a/util/zscore.m b/util/zscore.m
@@ -0,0 +1,6 @@
+function [x, mu, sigma] = zscore(x)
+	sigma=max(std(x),eps);
+	mu=mean(x);
+	x=bsxfun(@minus,x,mu);
+	x=bsxfun(@rdivide,x,sigma);
+end
