close all
clear all 
clc

T = 0.01;
tx = -20:T:20;
x = sinc(tx);
tg = -20:T:20;
g = sinc(tg);
y = T*conv(x,g);
ty = tx(1)+tg(1):T:tx(end)+tg(end);
y2 = sinc(ty);

figure
subplot(2,2,1)
plot(tx,x)
grid
xlabel('t')
ylabel('x(t)')
subplot(2,2,2)
plot(tg,g)
grid
xlabel('t')
ylabel('g(t)')
subplot(2,1,2)
plot(ty,y,ty,y2)
grid
xlabel('t')
ylabel('y(t)=x*g(t)')
legend('via MatLab','true signal')
sgtitle('continuous-time convolution')

% printing figure in png format
set(gcf,'PaperUnits','inches','PaperPosition',[0 0 6 4.5])
print -dpng homework1.png -r100