Taking an average of every n elements of one column

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Tony Chan 2020-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/523902-taking-an-average-of-every-n-elements-of-one-column

编辑： David Goodmanson 2020-5-8

Hi I have a 144x73x551 array. I want to take the average of every 12 elements in the third column into a new array. What is the best way to go about it? Thanks!

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Answer 1

David Goodmanson 2020-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/523902-taking-an-average-of-every-n-elements-of-one-column#answer_431104

编辑：David Goodmanson 2020-5-8

Hi Tony,

a = rand(144,73,551);     
b = squeeze(a(:,3,:));             % take all the third columns
c = mean(reshape(b,12,[]));        % reshape them into 12-row columns, take the mean
d = reshape(c,144/12,[]);          % put the 12 means down each new column, 551 columns

Taking every third column reduces the 3d array to a 2d array. The result is a set of means down each new column, with the old index down the third dimension being the column index of the new array.