How do I get the mean of always 4 columns

AA=permute(reshape(A.',4,1,[]),[2,1,3]); % where A is size 527040 X 16
AAA=squeeze(mean(AA)); 
% if you want to reshape it as matrix then
% reshape(AAA,size(A,1),[]) %% edit removed transpose

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Matt J 2019-4-15

Both the permute operation and the transpose operation allocate arrays the same size as A. sepblockfun avoids this.

madhan ravi 2019-4-15

@Antonio:Matt‘s file exchange is Perfect why not use his solution then?

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Matt J 2019-4-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/456516-how-do-i-get-the-mean-of-always-4-columns#answer_370740

编辑：Matt J 2019-4-15

在 MATLAB Online 中打开

One way is using sepblockfun, downloadable from here

https://www.mathworks.com/matlabcentral/fileexchange/48089-separable-block-wise-operations

Then you would do,

result = sepblockfun(yourArray, [1,4],'mean');

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Catalytic 2019-4-15

编辑：Catalytic 2019-4-15

@Antonio,

The only way I can Matt J's one line solution as being "too complicated" is that this is homework. So, you're not allowed to use third-party routines like sepblockfun as is, and it is a tedious matter for you to try to decipher what it is doing and adapt it to your assignment.

Antonio Melieni 2019-4-17