How to group elements in arrays?

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bio lim
bio lim 2015년 5월 28일
댓글: bio lim 2015년 6월 2일
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
Murali Krishna 2015년 5월 28일
can you clarify what do u mean by "group the elements of the array in f1 three by three"
bio lim
bio lim 2015년 5월 28일
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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Murali Krishna
Murali Krishna 2015년 5월 28일
편집: Murali Krishna 2015년 5월 28일
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
I assume that the length of the fields f1 to f5 is same. check for structure s1.a,s1.b...for the mean of 3 elements of respective fields..
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bio lim
bio lim 2015년 6월 2일
Are there any ways if the lengths of the fields are not same? Thanks!

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