how to caculate covariance matrix?

Question

bay rem 2015-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/259637-how-to-caculate-covariance-matrix

评论： Walter Roberson 2015-12-10

采纳的回答： Walter Roberson

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i tried to calculate covariance of matrix but an error appeared:

here is my matrix (3*3):

m=
197 27 197 28 197
196 27 196 28 196
195 27 195 28 195

where(26,197) describe piwel's position

and this is the error:

Error using bsxfun
Mixed integer class inputs are not supported.
Error in cov (line 154)
xc = bsxfun(@minus,x,sum(x,1)/m); % Remove mean
Error in fourptm (line 155)
c=cov(m)

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Answer 1

Walter Roberson 2015-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/259637-how-to-caculate-covariance-matrix#answer_202781

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cov(double(m))

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bay rem 2015-12-10

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thank you so much i already tried it, but Is it right to find such result:

       0     0     0     0     0     0
       0     1     0     1     0     1
       0     0     0     0     0     0
       0     1     0     1     0     1
       0     0     0     0     0     0
       0     1     0     1     0     1