comparison toolboxes/FullBNT-1.0.7/netlab3.3/mdnpost.m @ 0:cc4b1211e677 tip

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+function [post, a] = mdnpost(mixparams, t)
+%MDNPOST Computes the posterior probability for each MDN mixture component.
+%
+%	Description
+%	POST = MDNPOST(MIXPARAMS, T) computes the posterior probability
+%	P(J|T) of each data vector in T under the Gaussian mixture model
+%	represented by the corresponding entries in MIXPARAMS. Each row of T
+%	represents a single vector.
+%
+%	[POST, A] = MDNPOST(MIXPARAMS, T) also computes the activations A
+%	(i.e. the probability P(T|J) of the data conditioned on each
+%	component density) for a Gaussian mixture model.
+%
+%	See also
+%	MDNGRAD, MDNPROB
+%
+
+%	Copyright (c) Ian T Nabney (1996-2001)
+%	David J Evans (1998)
+
+[prob a] = mdnprob(mixparams, t);
+
+s = sum(prob, 2);
+% Set any zeros to one before dividing
+s = s + (s==0);
+post = prob./(s*ones(1, mixparams.ncentres));