function [engine, LL] = enter_evidence(engine, ev, t)% ENTER_EVIDENCE Call the online filter% [engine, loglik] = enter_evidence(engine, evidence, ...)%% evidence{i} = [] if if X(i) is hidden, and otherwise contains its observed value (scalar or column vector)engine.old_f = engine.f;if t==1  [engine.f, LL] = fwd1(engine.tbn_engine, ev, 1);else  [engine.f, LL] = fwd(engine.tbn_engine, engine.old_f, ev, t);endengine.b = backT(engine.tbn_engine, engine.f, t);engine.t = t;