# Compute cumulative sum of a column vector without for loop

6 views (last 30 days)
Aurelien Queffurust on 30 Mar 2012
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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Aurélien

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

C.J. Harris on 30 Mar 2012
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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