comparison toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/Old/convert_to_table.m @ 0:e9a9cd732c1e tip

first hg version after svn

+function T = convert_to_table(CPD, domain, local_ev, obs_bitv)
+% CONVERT_TO_TABLE Convert a discrete CPD to a table
+% function T = convert_to_table(CPD, domain, local_ev, obs_bitv)
+%
+% We convert the CPD to a CPT, and then lookup the evidence on the discrete parents.
+% The resulting table can easily be converted to a potential.
+
+
+CPT = CPD_to_CPT(CPD);
+obs_child_only = ~any(obs_bitv(1:end-1)) & obs_bitv(end);
+
+if obs_child_only
+  sz = size(CPT);
+  CPT = reshape(CPT, prod(sz(1:end-1)), sz(end));
+  o = local_ev{end};
+  T = CPT(:, o);
+else
+  odom = domain(obs_bitv);  
+  vals = cat(1, local_ev{find(obs_bitv)}); % undo cell array
+  map = find_equiv_posns(odom, domain);
+  index = mk_multi_index(length(domain), map, vals);
+  T = CPT(index{:});
+end