Your definition of a constant (or invariant) data with rand is problematic. If you increase the size of your data (n=1000, n=10000...), you can always increase the deviations (so what threshold for sigma ?). I think that with real data, this artifact isn't possible. No ?
Nice solution that looks pretty nifty but it actually produces an unsafe result, just like Matlab's own zscore. It passed on it's first run trough the test suite but fails on some number of repeats. I've now added a second pass with a know random seed.
Number of Circles in a Number
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Vectorizing, too easy or too hard?
Six Steps to PCA - Step 2: Covariance
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