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Updated grassmannian function and minor debugs
author Daniele Barchiesi <daniele.barchiesi@eecs.qmul.ac.uk>
date Wed, 31 Aug 2011 13:52:23 +0100
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function x = snr(s,r)
% SNR calculates the signal-to-noise ratio between the signal s and its
% representation r defined as:
% SNR = 20*log10(||s||_2/||s-r||_2)
err = s-r;
x = mag2db(norm(s(:))/norm(err(:)));