standar deviation of a matrix (specific elements)
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Dear friends
I want to obtain the standar deviation of a square matrix but only off-diagonal elements. anyone could help me?
Thanks!
采纳的回答
Star Strider
2015-6-8
Two ways, both producing the same value:
M = rand(7); % Create Data
diagM = nan(1,size(M,1));
M = M + diag(diagM);
Mmean1 = mean(M(:),'omitnan');
Mmean2 = mean(M(~isnan(M(:))));
4 个评论
juan moreno
2015-6-8
Star Strider
2015-6-8
Long day. Wrote mean, meant std. This works:
M = rand(7); % Create Data
diagM = nan(1,size(M,1));
M = M + diag(diagM);
Mmean1 = std(M(:),'omitnan');
Mmean2 = std(M(~isnan(M(:))));
It sets the diagonal to NaN, then takes the mean of all elements that are not NaN.
juan moreno
2015-6-8
Star Strider
2015-6-8
编辑：Star Strider
2015-6-8
My pleasure!
If my Answer solved your problem, please Accept it.
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