Average each element of cell array

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Carmel Howe
Carmel Howe 2015-10-25
评论： Paolo 2018-7-14
I have a 10x1 cell of separate events with each array having a size 384(time) x 5328(pixel). I want to average each pixel across each separate event. For example A{1,1}(1,1); averaged with A{2,1}(1,1) etc etc Thanks

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Stephen23
Stephen23 2015-10-25
编辑：Stephen23 2015-10-25
The easiest way is to use cat to concatenate the cell array of numeric arrays into a simple 3D numeric array, and then use the inbuilt mean function with its optional second argument to take the average along the third dimension:
X = your cell array
Y = cat(3,X{:});
out = mean(Y,3);
Here is a simple example showing how this works:
>> X = {[1,2,3;4,5,6],[0,2,4;6,8,10]};
>> Y = cat(3,X{:})
Y(:,:,1) =
1 2 3
4 5 6
Y(:,:,2) =
0 2 4
6 8 10
>> out = mean(Y,3)
out =
0.5 2 3.5
5 6.5 8
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Chalita
Chalita 2018-7-14
编辑：Chalita 2018-7-14
Hi. I'm new to matlab. This answer is very helpful for what I'm trying to do. Thanks.
I have about 1,000 cells in my cell array. What do I need to do if instead of taking average across all cells, I want to take average every 4 cells. That is, instead of 1 output cell, I should have 1,000/4 cells. Thanks
Paolo
Paolo 2018-7-14
@Chalita you should open a new question for your query.

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