diff toolboxes/FullBNT-1.0.7/bnt/CPDs/@gaussian_CPD/convert_to_pot.m @ 0:e9a9cd732c1e tip

first hg version after svn

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolboxes/FullBNT-1.0.7/bnt/CPDs/@gaussian_CPD/convert_to_pot.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,71 @@
+function pot = convert_to_pot(CPD, pot_type, domain, evidence)
+% CONVERT_TO_POT Convert a Gaussian CPD to one or more potentials
+% pot = convert_to_pot(CPD, pot_type, domain, evidence)
+
+sz = CPD.sizes;
+ns = zeros(1, max(domain));
+ns(domain) = sz;
+
+odom = domain(~isemptycell(evidence(domain)));
+ps = domain(1:end-1);
+cps = ps(CPD.cps);
+dps = ps(CPD.dps);
+self = domain(end);
+cdom = [cps(:)' self];
+ddom = dps;
+cnodes = cdom;
+  
+switch pot_type
+ case 'u',
+  error('gaussian utility potentials not yet supported');
+ 
+ case 'd',
+  T = convert_to_table(CPD, domain, evidence);
+  ns(odom) = 1;
+  pot = dpot(domain, ns(domain), T);          
+
+ case {'c','g'},
+  [m, C, W] = gaussian_CPD_params_given_dps(CPD, domain, evidence);
+  pot = linear_gaussian_to_cpot(m, C, W, domain, ns, cnodes, evidence);
+
+ case 'cg',
+  [m, C, W] = gaussian_CPD_params_given_dps(CPD, domain, evidence);
+  % Convert each conditional Gaussian to a canonical potential
+  cobs = myintersect(cdom, odom);
+  dobs = myintersect(ddom, odom);
+  ens = ns; % effective node size
+  ens(cobs) = 0;
+  ens(dobs) = 1;
+  dpsize = prod(ens(dps));
+  can = cell(1, dpsize);
+  for i=1:dpsize
+    if isempty(W)
+      can{i} = linear_gaussian_to_cpot(m(:,i), C(:,:,i), [], cdom, ns, cnodes, evidence);
+    else
+      can{i} = linear_gaussian_to_cpot(m(:,i), C(:,:,i), W(:,:,i), cdom, ns, cnodes, evidence);
+    end
+  end
+  pot = cgpot(ddom, cdom, ens, can);
+
+ case 'scg',
+  [m, C, W] = gaussian_CPD_params_given_dps(CPD, domain, evidence);
+  cobs = myintersect(cdom, odom);
+  dobs = myintersect(ddom, odom);
+  ens = ns; % effective node size
+  ens(cobs) = 0;
+  ens(dobs) = 1;
+  dpsize = prod(ens(dps));
+  cpsize = size(W, 2); % cts parents size
+  ss = size(m, 1); % self size
+  cheaddom = self;
+  ctaildom = cps(:)';
+  pot_array = cell(1, dpsize);
+  for i=1:dpsize
+    pot_array{i} = scgcpot(ss, cpsize, 1, m(:,i), W(:,:,i), C(:,:,i));
+  end
+  pot = scgpot(ddom, cheaddom, ctaildom, ens, pot_array);
+
+ otherwise,
+  error(['unrecognized pot_type' pot_type])
+end
+