function m = marginal_family(engine, i, t, add_ev)% MARGINAL_FAMILY Compute the marginal on the specified family (jtree_dbn)% marginal = marginal_family(engine, i, t)% This is just like inf_engine/marginal_family, except when we call% marginal_nodes, we provide a 4th argument, to tell it's a family.if nargin < 3, t = 1; endif nargin < 4, add_ev = 0; endbnet = bnet_from_engine(engine);if t==1  m = marginal_nodes(engine, family(bnet.dag, i), t, add_ev, 1);else  ss = length(bnet.intra);  fam = family(bnet.dag, i+ss);  if any(fam<=ss)    % i has a parent in the preceeding slice    % Hence the lowest numbered slice containing the family is t-1    m = marginal_nodes(engine, fam, t-1, add_ev, 1);  else    % The family all fits inside slice t    % Hence shift the indexes back to slice 1    m = marginal_nodes(engine, fam-ss, t, add_ev, 1);  endend