Delete points from a graph

Hello everyone, I am a beginner on matlab.

I would like to remove the part of my signal that is at 0.

Here is my program :

f=100;
t1=1/f;
t=0:t1:1;
x=sin(2*pi*3*t);

fe=22;
te=1/fe;
ta=0:te:1;
xe=sin(2*pi*3*ta);

tf=0:t1:1;
xrect=rectpuls(tf,2*1/3);

subplot(2,1,1);
stem(ta,xe,'b');
hold on;
plot(t,x); 
plot(tf,xrect,'black');
hold off;
grid on;

subplot(2,1,2);
C=times(x,xrect);
plot(t,C);
grid on;

Thank you in advance for your answers.

Answer 1

[KSSV]

idx = C~=0 ; 
plot(t(idx),C(idx));
grid on;

[KSSV]

@Zenplay commented: Thank you for your answer KSSV :) It works perfectly !