two_cos;

%% this will be used to provide the guide for the user
t_envelope=linspace(t_start, t_end, 10*N);
y_envelope=f(t_envelope);

plot( t_envelope, y_envelope, 'k-', t, y, 'bo' );
fontSize=FontSizeSet; set(gca,'FontSize', fontSize );
xlabel('Time, S');
ylabel('y(t) and y(t_k)');
legend('y(t)', 'y(t_k)');


