How to get a sum of a series

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dav
dav 2014-2-20
回答： Muruganandham Subramanian 2014-2-20
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

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采纳的回答

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

更多回答（2 个）

Muruganandham Subramanian
Try using 'cumsum' command
David Young
David Young 2014-2-20
编辑：David Young 2014-2-20
If you want the sum over i for each t, then it's
Y = conv(X, A, 'valid');

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