function marginal = marginal_family(engine, i, t, add_ev)% MARGINAL_FAMILY Compute the marginal on the specified family (jtree_unrolled_dbn)% marginal = marginal_family(engine, i, t)if nargin < 3, t = 1; endif nargin < 4, add_ev = 0; endassert(~add_ev);%marginal = marginal_family(engine.unrolled_engine, i + (t-1)*engine.ss, add_ev);marginal = marginal_family(engine.unrolled_engine, i + (t-1)*engine.ss);