Vectorizing the loop

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Nirmal 2012-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/36432-vectorizing-the-loop

This code is similar to the histc function, but each element has weights associated with it. I'm looking to either use an alternate function or to vectorize it to make things faster

I have arrays A and B, and w is an array of weights associated with each element in A.

I'm hoping to calculate:

for i=1:length(B)
           x(i) = sum((A>B(i)).*w)
end

Any help is appreciated. Thanks.

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Nirmal 2012-4-24

Not sure if that works - particularly because cumsum(histc(...)) will have the size of B and w will have the size of A.

Sean de Wolski 2012-4-24

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采纳的回答

Sean de Wolski 2012-4-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36432-vectorizing-the-loop#answer_45574

在 MATLAB Online 中打开

x = w*bsxfun(@gt,A.',B)

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Nirmal 2012-4-24

Awesome

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