std does not give good values?

2013 11 14
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更新时间：2013 11 28
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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
Roger Stafford 2013-11-14
编辑：Roger Stafford 2013-11-14

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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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