wolffd@0: function m = marginal_family(engine, i, t)
wolffd@0: % MARGINAL_FAMILY Compute the marginal on i's family (inf_engine)
wolffd@0: % m = marginal_family(engine, i, t)
wolffd@0: %
wolffd@0: % t defaults to 1.
wolffd@0: 
wolffd@0: if nargin < 3, t = 1; end
wolffd@0: 
wolffd@0: bnet = bnet_from_engine(engine);
wolffd@0: if t==1
wolffd@0:   m = marginal_nodes(engine, family(bnet.dag, i));
wolffd@0: else
wolffd@0:   ss = length(bnet.intra);
wolffd@0:   fam = family(bnet.dag, i+ss);
wolffd@0:   if any(fam<=ss)
wolffd@0:     % i has a parent in the preceeding slice
wolffd@0:     % Hence the lowest numbered slice containing the family is t-1
wolffd@0:     m = marginal_nodes(engine, fam, t-1);
wolffd@0:   else
wolffd@0:     % The family all fits inside slice t
wolffd@0:     % Hence shift the indexes back to slice 1
wolffd@0:     m = marginal_nodes(engine, fam-ss, t);
wolffd@0:   end
wolffd@0: end