function [f, logscale] = fwd1(engine, ev, t)% Forwards pass for slice 1.bnet = bnet_from_engine(engine);ss = bnet.nnodes_per_slice;CPDpot = cell(1,ss);for n=1:ss  fam = family(bnet.dag, n, 1);  e = bnet.equiv_class(n, 1);  CPDpot{n} = convert_to_pot(bnet.CPD{e}, engine.pot_type, fam(:), ev);end       f.t = t;f.evidence = ev;pots = CPDpot;slice1 = 1:ss;CPDclqs = engine.clq_ass_to_node1(slice1);[f.clpot, f.seppot] =  init_pot(engine.jtree_engine1, CPDclqs, CPDpot, engine.pot_type, engine.observed1);[f.clpot, f.seppot] = collect_evidence(engine.jtree_engine1, f.clpot, f.seppot);for c=1:length(f.clpot)  [f.clpot{c}, ll(c)] = normalize_pot(f.clpot{c});endlogscale = ll(engine.root1);