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.
Sort a list of complex numbers based on far they are from the origin.
Sums with Excluded Digits
Tune your guitar
Find last non-zero in a given dimension
QWERTY Shift Code Decoder
Six Steps to PCA - Step 2: Covariance
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