Stop a sum of numbers until a certain value is reached

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Pilar Jiménez 2019-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/486640-stop-a-sum-of-numbers-until-a-certain-value-is-reached

评论： Pilar Jiménez 2019-10-22

采纳的回答： Image Analyst

If I have defined values

Nmax = 15;

A = [2 5 4 6 1];

I want to make a sum of each value of A in the order in which it is found until it reaches Nmax, if the value is equal to or greater than Nmax the sum stops and the number or numbers that have been pending to be added are saved in another vector B.

How did you get the sum to stop and tell me the index of the vector at which it stopped to be able to save the values forward in the other vector?

Thank you in advance for your help

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Answer 1

Image Analyst 2019-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/486640-stop-a-sum-of-numbers-until-a-certain-value-is-reached#answer_397539

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You can use cumsum() to do it vectorized, like most MATLABers would:

Nmax = 15;
A = [2 5 4 6 1];
ca = cumsum(A)  % Sum them all up
lastIndex = find(ca <= Nmax, 1, 'last') % Last index before the sum would exceed Nmax.
% Show what elements they were "Pending" (whatever that means in this context).
B = A(lastIndex + 1 : end)  % The remaining numbers

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Pilar Jiménez 2019-10-22

Thank you for your help. It really helps me a lot for what I have to do, I've been trying for a long time, I didn't know that the "cumsum" command existed.

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