Cumulative sum at over an specified interval

Question

Karina Gutierrez 2017-2-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/326675-cumulative-sum-at-over-an-specified-interval

评论： Beder 2017-3-3

Hi, I have an input vector of data that I would like to process to have a cumulative sum that resets and starts every 7 data points. For instance consider I have the following:

A = 1,0,2,2,4,1,0,7,2,3,1,0,0,1

I want to create a cumulative sum for the first 7 points and then start over again for the next set of 7 points, then I have:

B = 1,1,3,5,9,10,10,7,9,12,13,13,13,14

Thanks in advance! Karina

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Answer 1

Beder 2017-2-24

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/326675-cumulative-sum-at-over-an-specified-interval#answer_256140

在 MATLAB Online 中打开

 B=reshape(A,7,[]);
 C=cumsum(B,1);
 D=reshape(C,[],1);

Or:

B=reshape(cumsum(reshape(A,7,[]),1,[],1);

Be careful: This only works as long as the length of A is divisible by 7.

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Karina Gutierrez 2017-2-27

That worked great! However, my datasets are variable in size and not all have a length that is divisible by 7. Is there a way to change the length of A to the nearest length divisible by 7? For example, if I have an array of length 15, I can make a code to omit the last point and reshape A to size 14?

Else I am going to have to go manually deleting data to make it the right length?

Thanks again for your help!

Beder 2017-3-3