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Vectorization of a for loop (addition of a vector)

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David
David 2014-10-23
编辑： Mohammad Abouali 2014-10-23
Hello MATLAB community,
I have a question concerning the vectorization of a for loop to speed up my code. What I have is a vector, let´s say:
a = [1 2 3 4 5 6 7 8 ]
What I want to do is to create a vector, which makes an addition of all values in the vector to the point which I am actually at. In this case it would be:
a_new = [1 3 6 10 15 21 28 36]
It´s no problem to code this with a for loop.
s_neu = zeros (1,length(s),'double');
s_neu(1,1) = s(1,1);
for i = 2:length(s)
s_neu(1,i) = s_neu(1,i-1)+s(1,i);
end
Do anyone of you know, how to code this without the for loop? Thank you very much!

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Mohammad Abouali
Mohammad Abouali 2014-10-23
编辑：Mohammad Abouali 2014-10-23
This is cumulative sum so use cumsum function
a = [1 2 3 4 5 6 7 8 ]
a_new=cumsum(a)
a_new =
1 3 6 10 15 21 28 36

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