Compute cumulative sum of a column vector without for loop

4 次查看（过去 30 天）
Aurelien Queffurust
For each index of a column vector , I want to compute the sum from index to index+spacing. spacing is an integer.
My aim is not to use for-loop but I didn't manage to find a way to avoid it:
A=(1:10)'; % column vector
spacing = 4; % scalar
solution = zeros(length(A)-spacing,1);
for index=1:length(A)-win % equals 6 in this example
solution(index)=sum(A(index:index+spacing));
end
solution =
15
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35
40
Thanks for your help!
Aurélien

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采纳的回答

the cyclist
the cyclist 2012-3-30
The filter() command is one way:
tmp = filter(ones(1,spacing+1),1,A);
solution = tmp(spacing+1:end)

更多回答（1 个）

C.J. Harris
C.J. Harris 2012-3-30
A=(1:10)'; % column vector
spacing = 4; % scalar
solution = arrayfun(@(n) sum(A(n):A(n+spacing)), 1:length(A)-spacing)';

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