h=[-1, 3, 4, 2]
x=[1, 3, -1, 2, 5]
y=conv(x,h)
H=numel(h)
X=numel(odx)
C=H+X-1
Y=0*(1:C)
x = [x,0*(1:(C-X))]
h = [h,0*(1:(C-H))]
for n=0:C-1
    for k=0:n
       Y(1+n)=Y(1+n)+x(1+k)*h(1+n-k)
    end
end