计算数组元素的总和并在MATLAB中为整个数组重复 [英] Calculating sum of array elements and reiterate for entire array in MATLAB

问题描述

我有一个大小为7812x1的向量A，想计算长度为21的固定窗口的总和(因此为372个块).应该重申这一点，以便输出应返回大小为372x1的向量.

I have a vector A of size 7812x1 and would like to calculate the sum of fixed windows of length 21 (so 372 blocks). This should be reiterated, so that the output should return a vector of size 372x1.

我有t=7812，p=372，w=21;

for t=1:p
   out = sum(A((t*w-w+1):(t*w)));
end

但是，此代码不起作用.我的想法是，零件((t*w-w+1):(t*w))允许滚动窗口之类的东西.该窗口的长度为21，因此实际上不需要使用变量来表达它，但我认为它具有一定的灵活性.

This code, however, does not work. My idea is that the part ((t*w-w+1):(t*w)) allows for something like a rolling window. The window is of length 21, so there is not really a need to express is with variables, yet I think it keeps some flexibility.

我已经看到了潜在的相关问题(例如向量的部分和)，但是我不确定这是否会导致所需的输出.

I've seen potentially related questions (such a partial sum of a vector), yet I'm not sure whether this would result the output desired.

推荐答案

遵循使用滚动/移动窗口的想法(需要Matlab 2016a或更高版本):

Following your idea of using a rolling/moving window (requires Matlab 2016a or later):

t = 7812; w = 21; % your parameters
A = rand(t,1); % generate some test data

B = movsum(A,w); % the sum of a moving window with width w
out = B(ceil(w/2):w:end); % get every w'th element

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