function [f, logscale] = fwd1(engine, ev, t)% Forwards pass for slice 1.if t ~= 1  error('mixed up time stamps')endprior = engine.startprob(:);f.obslik = mk_hmm_obs_lik_vec(engine, ev);[f.alpha, lik] = normalise(prior .* f.obslik);logscale = log(lik);f.t = t;