vectors must be at the same length error

Hi, im trying to plot this fuction but im getting th 'vectors must be at the same length' error, Can anybody help to find a solution?

t=-10:10;
x = heaviside(t+2)-heaviside(t-2);
plot(t,x);

y = awgn(x,21,'measured');
plot(t,[x y]);
legend('Original Signal','Signal with AWGN');

Answer 1

[Daniel M]

You are concatenating x and y into a doubly long vector. If you want to plot both signals, do

plot(t,x,t,y)

[fatemeh p]

Thanks