matlab code

Question

I miss understand the this code

 

clear all;
Ts=1e-2; t=0:Ts:10; x1 = exp(-13/5.*t);
h1=3*exp(-2*t)+2*exp(-3*t);

y1=conv(x1,h1)*Ts;
t2=0:Ts:20;
figure;
plot(t2,y1);grid; ylabel('y1'); xlabel('t')

 

the range t for the x1 is between 0 and 10, but why the range for the plot t2 has to between 0 and 20.

Answer 1

In MATLAB, a row vector can be created using the following format:

 

(vector name) = (starting value):(step size):(end value)

Ts = 1e-2; assigns the value .01 to the variable Ts.

 

t2=0:Ts:20; creates a vector with starting value 0, step size .01, and end value 20.  This would be

 

[0, .01, .02, ... 19.98, 19.98, 20].