How to group elements in arrays?

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bio lim 2015-5-28

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评论： bio lim 2015-6-2

Let's say I have a 1 x 5 structure array, 'data' with fields 'f1' 'f2' 'f3' 'f4' 'f5'. What I am trying to do is to group the elements of the array in f1 three by three, and find the corresponding mean of the elements in f2 - f5. Can anyone help me to do this? Thanks!

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Murali Krishna 2015-5-28

can you clarify what do u mean by "group the elements of the array in f1 three by three"

bio lim 2015-5-28

There are five arrays in each field. (all of them are 1x20). Let's say the first array in the f1 field looks like this. data(1).f1 = [data(1).f1(1) data(1).f1(2)........ data(1).f1(20).

I want to group the elements three by three like (data(1).f1(1), data(1).f1(2), data(1).f1(3)). By doing this, I wanted to find the corresponding mean of the other fields.

mean(data(1).f2(1), data(1).f2(2), data(1).f2(3)), and so on. The problem is I have a large number of arrays, and wanted to use a loop. Any idea? Thanks.

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Answer 1

Murali Krishna 2015-5-28

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https://ww2.mathworks.cn/matlabcentral/answers/219972-how-to-group-elements-in-arrays#answer_180810

编辑：Murali Krishna 2015-5-28

在 MATLAB Online 中打开

I think this may solve ur problem

m=floor(length(data(1).f1)/3)
for l=1:1:length(data)
t=0;
for k=1:1:m
s1(l).a(k)=mean(data(l).f1(1+t:3+t));
s1(l).b(k)=mean(data(l).f2(1+t:3+t));
t=t+3;
end
end