Finding the mean of each column of each double within a structure

Question

Tanika Bawa 2022-8-29

0
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https://ww2.mathworks.cn/matlabcentral/answers/1790200-finding-the-mean-of-each-column-of-each-double-within-a-structure

评论： Tanika Bawa 2022-8-30

Hello! I would like to find the mean of each double within this structure (named beh_data). Each double contains 4 columns. I would like to have the mean of each column (ideally the 2nd, 3rd and 4th column only), for each double.

I have tried various things eg:

MeanMovementPerTrial = [];

for i = 1:length (beh_data)

MeanMovementPerTrial(i) = structfun (@mean,beh_data.data(i),'UniformOutput',false);

end

Or even simpler stuff, but I keep getting different errors. Do you know how I can do this? Thank you =)

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David Hill 2022-8-29

We would be better able to help you if you attached your data.

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Answer 1

dpb 2022-8-29

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1790200-finding-the-mean-of-each-column-of-each-double-within-a-structure#answer_1037300

在 MATLAB Online 中打开

Something like

M=arrayfun(@(s)mean(s.Data(:,2:end)),beh_data,'UniformOutput',0).'; % calculate the means
M=cellfun(@(c)struct('Means',c),M,'UniformOutput',1);               % put them in a new struct array

Use arrayfun to iterate over the struct array, returning a cell array of the means. Then convert those to a new struct array by operating on each via cellfun.

If one were really a glutton for trying to play "MATLAB golf", see if can figure out and keep straight doing both in one line... :)