Error using plot Vectors must be the same length in convolution

Error in "Vector must be the same length" at plot

I don't know what wrong, can someone point out the mistake i make.

%Calculate the convolution of signals:
t= -5:0.01:5;
x1= @(t) (2*us(1-t)+us(t+2))+...
                -2*(us(t-1)+us(4-t)));
x2=@(t) (3*(us(t+2)-us(t-2)));
%%%
h= @(t) (3.*exp((1/3).*t).*us(t-3));
%%%
y1= conv(x1(t),h(t));
y2= conv(x2(t),h(t));
plot(t,y1,t,y2);

[madhan ravi]

us?

[Nam Nguyen]

Oh yeah, that is unit step function.

Answer 1

[madhan ravi]

size(t) , size(y1) and size(y2) have to be the same