Mercurial > hg > camir-aes2014
view toolboxes/FullBNT-1.0.7/bnt/inference/static/@cond_gauss_inf_engine/marginal_nodes.m @ 0:e9a9cd732c1e tip
first hg version after svn
author | wolffd |
---|---|
date | Tue, 10 Feb 2015 15:05:51 +0000 |
parents | |
children |
line wrap: on
line source
function marginal = marginal_nodes(engine, query, add_ev) % MARGINAL_NODES Compute the marginal on the specified query nodes (cond_gauss) % marginal = marginal_nodes(engine, query, add_ev) % % 'query' must be a singleton set % add_ev is an optional argument; if 1, we will "inflate" the marginal of observed nodes % to their original size, adding 0s to the positions which contradict the evidence if nargin < 3, add_ev = 0; end if length(query) ~= 1 error('cond_gauss_inf_engine can only handle marginal queries on single nodes') end j = query; bnet = bnet_from_engine(engine); if myismember(j, bnet.cnodes) if ~myismember(j, engine.onodes) [m, C] = collapse_mog(engine.mu{j}, engine.Sigma{j}, engine.T); marginal.mu = m; marginal.Sigma = C; marginal.T = 1.0; % single mixture component else marginal.mu = engine.evidence{j}; k = bnet.node_sizes(j); marginal.Sigma = zeros(k,k); marginal.T = 1.0; % since P(E|E)=1 end else marginal = pot_to_marginal(marginalize_pot(engine.joint_dmarginal, j)); if add_ev marginal = add_ev_to_dmarginal(marginal, engine.evidence, bnet.node_sizes); end end marginal.domain = query;