Averaging in a cell array

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avantika 2014-9-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/154390-averaging-in-a-cell-array

评论： Andrei Bobrov 2014-9-12

采纳的回答： Andrei Bobrov

Hi!

I have a cell array named data (4856x24). The data looks as follows

I want to write a function that averages out the values in each row for positive emotions (Happy,Romantic,Devotional,Calm) and negative emotions(Angry,Longing,Sad,Tensed).The averaged out value column names should be positive and negative respectively. Can anyone pls help. Thanks in advance.

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Adam 2014-9-11

I'm not sure what you mean by averaging out when the inputs are strings.

I would suggest you use a struct or table (if you are using Matlab 2014) though for your data as having column headings as the first row of a cell array is a lot less easy to work with than having them as fields of a struct or table headings.

avantika 2014-9-12

编辑：avantika 2014-9-12

Hi!

I am using matlab 2013a.

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Answer 1

Andrei Bobrov 2014-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/154390-averaging-in-a-cell-array#answer_151367

在 MATLAB Online 中打开

t1 = ~cellfun('isempty',regexp(data(1,:),'Happy|Romantic|Devotional|Calm'));
t2 = ~cellfun('isempty',regexp(data(1,:),'Angry|Longing|Sad|Tensed'));
out = [data(1,:);cell(1,size(data,2))];
out(2,t1) = num2cell(mean(cell2mat(data(2:end,t1))));
out(2,t2) = num2cell(-mean(cell2mat(data(2:end,t2))));

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avantika 2014-9-12

Thanks a lot! I was able to this myself, by modifying your code a bit!

Andrei Bobrov 2014-9-12

Hi Avantika! I beg to fulfill the request by Sean, he will show us a more better solution with table array.

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Answer 2

Sean de Wolski 2014-9-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/154390-averaging-in-a-cell-array#answer_151368

编辑：Sean de Wolski 2014-9-11

If you convert that to a table (cell2table) and covert the feelings to a categorical, you can then use grpstats and varfun to do this for you, grouping by whatever you want.

If you post the mat file (as a zip) I can help you through these steps, it'll be much simpler and easier to understand than regular expressions/cellfun.