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
20
25
30
35
40
Thanks for your help!
Aurélien

请先登录，再回答此问题。

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)';

类别

在 Help Center 和 File Exchange 中查找有关 Matched Filter and Ambiguity Function 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by