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How to find standard deviation of all entries in a range and omit nan

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Adam Friedman
Adam Friedman 2021-9-25
回答： Chunru 2021-9-26
Suppose I have a matrix that contains NaN entries. I want to find the the standard deviation of all entries in the range (r1:r2,c1:c2) and omit NaN entries. Is there a way to do this without extracting data range first and storing it as a new entry?
I Want to avoid this
A=rand(10);
ssA=A(2:4,3:7); % Sub Set of A
StdssA=std(ssA(:),'omitnan')
And instead do something like this:
A=rand(10);
StdssA=std(A(2:4,3:7),'omitnan')
Unfortunately, this only gives me the std of this range based on whatever dim I specifiy. I want to get the std of all elements in this range with one line of code.

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回答（1 个）

Chunru
Chunru 2021-9-26
Ran in:
A=rand(10);
StdssA=std(A(2:4,3:7), 0, 'all', 'omitnan') % doc std
StdssA = 0.3421

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