Standard Deviation of 3D matrix with NaN elements
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I have a 3D matrix of size (170 x 170 x 27). Some of the entries are NaN, zero and the rest have real values.
I would like to obtain the standard deviation of this matrix, excluding the NaNs. I have tryed several commands, but I haven't been able to get this to work.
Could you help me?
Thank you in advance,
Antonio :)
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Johannes Fischer
le 17 Sep 2019
As described in the doumentation for std, there is a flag on how to deal with 'NaN' values. If you want the standard deviation of all values, excluding the NaNs, then write
% dummy matrix
m=rand(170, 170, 27);
m(m>0.9) = NaN;
sdev = std(m, 0, 'all', 'omitnan')
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Rik
le 17 Sep 2019
The 'all' syntax was introduced in R2018b, so you'll have to linearize your array like I describe in my answer. doc for R2018a, doc for R2018b
Rik
le 17 Sep 2019
This syntax should work for most releases:
sdev=std(m(:),'omitnan');
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