根据函数分配Matlab向量 [英] Assigning a Matlab vector according to a function

问题描述

我基本上想向量化以下内容:

I basically want to vectorize the following:

vect_y = zeros(1,numel(vect_x);
for i = 1:numel(vect_x)
    vect_y = sum(vect_x(1:i));
end

这可能吗?例如，我尝试通过以下方式使用arrayfun:

Is this possible? As an example, I was trying to use arrayfun the following way:

y = arrayfun(@(y) sum(y), vect_x(1:1), vect_x(1:2), ..., vect_x(1:n));

但是这行不通，也不干净.

But this won't work and it's not clean.

因此，我现在知道cumsum可以解决上述问题，但是我对如何对任何功能执行此操作感到好奇.

edit: So I know now that cumsum solves the above, but I am curious as to how I would do this for any function.

推荐答案

您可以使用 cumsum 直接运行:

What you want can be done with the cumsum function directly:

vect_y = cumsum(vect_x);

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