MATLAB: How to make convolution on sinc function and square function

Question

this is my code

t = -10:0.001:10;

h = sin(pi*t)./(pi*t);

t1=-10:0.01:-1;

t2=-1:0.01:1;

t3=1:0.01:10;

t4=[t1 t2 t3];

x1=zeros(size(t1));

x2=ones(size(t2));

x3=zeros(size(t3));

x=[x1 x2 x3];

c=conv(h,x);

hold on;

subplot(3,1,1);

plot(t,h)

stem(t,h,'g');

hold on;

subplot(3,1,2);

plot(t4,x,'b');

stem(t4,x,'b')

hold on;

subplot(3,1,3);

plot(t,c,'r');

stem(t,c,'r')

hold off

:

But the figure for the convolution part is not come out. What should I do?

Answer 1

t=-10:.01:10;
y1=sinc(t);
y2=zeros(size(t)); 
y2(t>=-1 & t<=1)=1;
c=conv(y1,y2);
stem(c);