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Split values in an cell array by using a threshold

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Sabari G
Sabari G on 19 May 2020
Commented: Sabari G on 20 May 2020
Hello everyone.I have a cell array of variable (A), 1x91.In each cell it has an array of size 256x256.I would like to threshold each array so that elements lesser than or greater than a given threshold value are stored in different variable.Your help is really appreciated.


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Accepted Answer

Matt J
Matt J on 19 May 2020
Edited: Matt J on 19 May 2020
One way,
A_lower = cellfun(@(x) x(x<threshold), A, 'uni',0);
A_upper = cellfun(@(x) x(x>threshold), A, 'uni',0);


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Sabari G
Sabari G on 19 May 2020
It doesnt work.It shows error message like this.can u suggest me another way and I have one doubt in the code..what does the X means in the above code.
Error using cellfun
Input #2 expected to be a cell array, was double instead.
Error in duru (line 36)
A_lower = cellfun(@(x) x(x<threshold), A, 'uni',0);.
Matt J
Matt J on 19 May 2020
In the case where you got empty matrices, it because none of your data fall below 0.5. In the case where you got error messages, it is because your A variable is not a cell array.
Below is a small example showing that the technique will work when properly applied:
>> A={rand(3), rand(3)}; A{:}
ans =
0.5407 0.9734 0.1941
0.8929 0.6006 0.7933
0.9092 0.8582 0.8144
ans =
0.5087 0.0331 0.7163
0.3399 0.1797 0.3758
0.6815 0.7166 0.3589
>> A_lower = cellfun(@(x) x(x<0.5), A, 'uni',0); A_lower{:}
ans =
ans =

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