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how to calcul Standard deviation of matrix

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bay rem
bay rem 2015-12-29
回答： Star Strider 2015-12-29
hello every one, i have a set of matrix and i wanna calculate a standard deviation of each matrix, here i tried :
std(M)
  • it gives me a result in a vector, i wanna have only one result here also i tried :
std(M(:))
  • an error appeared:
Error using var (line 65)
First argument must be single or double.
Error in std (line 38)
y = sqrt(var(varargin{:}));
Error in ndhif2 (line 178)
s=std(M(:))
  • i tried also:
std(double(M:))
  • here the results all the same for all matrices= 0.5477
  • i wonder how to correct it

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回答（2 个）

Walter Roberson
Walter Roberson 2015-12-29
std(M(:))
Star Strider
Star Strider 2015-12-29
What is the result of calling whos just before you call std?
For example:
whos('M')
s = std(M(:))

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