function m = marginal_family(engine, i, t)% MARGINAL_FAMILY Compute the marginal on i's family (inf_engine)% m = marginal_family(engine, i, t)%% t defaults to 1.if nargin < 3, t = 1; endbnet = bnet_from_engine(engine);if t==1  m = marginal_nodes(engine, family(bnet.dag, i));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);  else    % The family all fits inside slice t    % Hence shift the indexes back to slice 1    m = marginal_nodes(engine, fam-ss, t);  endend