How to get a sum of a series

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dav
dav on 20 Feb 2014
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

Accepted Answer

kjetil87
kjetil87 on 20 Feb 2014
t = 3:100;
sumY=0;
for i=0:2
sumY = sumY+sum(A(1+i)*X(t-i)) ;
end
like this?

More Answers (2)

Muruganandham Subramanian
Muruganandham Subramanian on 20 Feb 2014
Try using 'cumsum' command

David Young
David Young on 20 Feb 2014
Edited: David Young on 20 Feb 2014
If you want the sum over i for each t, then it's
Y = conv(X, A, 'valid');

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