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annotate DL/Majorization Minimization DL/softthreshold.m @ 193:cc540df790f4 danieleb

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Simple example that demonstrated dictionary learning... to be completed
author Daniele Barchiesi <daniele.barchiesi@eecs.qmul.ac.uk>
date Fri, 09 Mar 2012 15:12:01 +0000
parents b14209313ba4
children
rev   line source
ivan@155 1 % Soft threshold operator for matrices
ivan@155 2 % [Y] = softthreshold(X,theta)
ivan@155 3 % X : input matrix
ivan@155 4 % theta : thresholding parameter
ivan@155 5 function [Y] = softthreshold(X,theta)
ivan@155 6 Y = X - min(theta,abs(X)).*sign(X);