How can I rewrite this MATLAB code using vectorization?

How can I write this code faster in MATLAB? Maybe using vectorizations. Basically I do not know how to vectorize with if

for c=1:county_size
                for w=1:scenario_size
                    for t=tt:time_size
                        l = u(c,t,w) ;
                        tprime = t ;
                        while (l==0)
                            if tprime > time_size-1
                                tprime = time_size + 1 ;
                                B(c,time_size + 1,w) = 0 ;
                                u(c,time_size + 1,w) = 1 ;
                                break
                            end
                            l = u(c,tprime+1,w) ;
                            tprime = tprime + 1 ;
                        end
                        benefit(c,t,w) = B(c,tprime,w)/u(c,tprime,w) ;
                        i(c,t,w)       = tprime ;
                    end
                end
            end