std does not give good values?
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Hello everybody,
For this matrix
M = [1 2; 3 4];
if we compute the its standard deviation
std(M(:))
then we obtain 1.2910, while by definition, it should be 1.1180. Why is there such a difference?
Thank you for your help.
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Roger Stafford
il 14 Nov 2013
Modificato: Roger Stafford
il 14 Nov 2013
The 1.2910 value is the unbiased standard deviation which is default while the 1.1118 value is the second moment. Read the documentation for 'std' at:
http://www.mathworks.com/help/matlab/ref/std.html
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