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

first hg version after svn

+function p = prob_node(CPD, self_ev, pev)
+% PROB_NODE Compute P(y|pa(y), theta) (tabular)
+% p = prob_node(CPD, self_ev, pev)
+%
+% self_ev{m} is the evidence on this node in case m
+% pev{i,m} is the evidence on the i'th parent in case m
+% If there is a single case, self_ev can be a scalar instead of a cell array
+
+ncases = size(pev, 2);
+
+%assert(~any(isemptycell(pev))); % slow
+%assert(~any(isemptycell(self_ev))); % slow
+
+CPT = CPD_to_CPT(CPD);  
+sz = mysize(CPT);
+nparents = length(sz)-1;
+assert(nparents == size(pev, 1));
+
+if ncases==1 
+  x = cat(1, pev{:});
+  if iscell(y)
+    y = self_ev{1};
+  else
+    y = self_ev;
+  end
+  switch nparents
+   case 0, p = CPT(y);
+   case 1, p = CPT(x(1), y);
+   case 2, p = CPT(x(1), x(2), y);
+   case 3, p = CPT(x(1), x(2), x(3), y);
+   otherwise,
+    ind = subv2ind(CPD.sizes, [x y]);
+    p = CPT(ind);
+  end
+else
+  x = num2cell(pev)'; % each row is a case
+  y = cat(1, self_ev{:})';
+  ind = subv2ind(CPD.sizes, [x y]);
+  p = CPT(ind);
+end