Standard deviation ignoring 0s in matrix
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Hi all, I have a 295x34 matrix called Absy. I want to take the standard deviation of all the columns, however some columns contain many zeros. I want to ignore the zeros and take the standard deviation (as zeros are only their due to some columns being different size).
Thank you.
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Matt Kindig
2012 年 7 月 24 日
One easy way would be to convert all zeros to NaN, and then use the nanstd function to ignore the NaNs in the std calculation.
Absy(Absy==0)=NaN;
s = nanstd(Absy,[],1); %column by column std deviation
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