How to get a sum of a series

Hello,

I need to get the sum of

Y(t)= A(i)*X(t-i)

where X is a vector of size (100,1). A is a vector of size (3,1)

i=0 to 2 and t= 3 to 100.

Any help is greatly appreciated.

Thanks

Dav

Answer 1

[kjetil87]

t = 3:100;
sumY=0;
for i=0:2
  sumY = sumY+sum(A(1+i)*X(t-i)) ;
end

like this?

Answer 2

[Muruganandham Subramanian]

Try using 'cumsum' command

Answer 3

[David Young]

If you want the sum over i for each t, then it's

Y = conv(X, A, 'valid');