hold off ;
alpha = 0.5 ;
x = [-5:0.01:5] ;
plot(x,h0(x),'.-b','LineWidth',1.5) ; hold on ;
plot(x,trasporto(x,1,alpha,@h0),'+-r') ; hold on ;
plot(x,trasporto(x,2,alpha,@h0),'o-y') ; hold on ;
plot(x,trasporto(x,3,alpha,@h0),'.-m') ; hold on ;
plot(x,trasporto(x,4,alpha,@h0),'.-g') ; hold on ;

legend('p0','t=1','t=2','t=3','t=4');
axis([-5,5,-0.1,1.1]);