clear all
x=[0 0 2 4 5 -3 0 ]
x_=x;
h=[1 2 1  3 -1 4];
h_=h;
m=zeros(length(x)+length(h)-1);

for i=1:length(h)
for j=1:length(x)
m(i,j)=x(j)
end

x=[0 x]
end
for i=1:length(h)
k(i,:)=h(i)*m(i,:)
end
sum(k)
subplot(3,1,1)
stem(x_)
grid on
subplot(3,1,2)
stem(h_)
grid on
subplot(3,1,3)
stem(sum(k))
grid on