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