error in std for 3d matrix
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Hey guys!
I am trying to find the std of a 3D matrix, where size(X) is 207 x 201 x 34. Since I must reshape to find std, I am using this formula: std(reshape(X,1,207*201*34)).
And I obtain this error: Error in std (line 31) y = sqrt(var(varargin{:}));
When I look at the syntax, I thought of using std(reshape(X,1,207*201*34), 0, 3), where 3 is for 3D, however I still obtain the same error.
What I am missing?
Thank you very much in advance!
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Steven Lord
2016년 12월 12일
What is the full text of the error message (including everything printed in red?)
답변 (2개)
Guillaume
2016년 12월 13일
Error: First argument must be single or double
Well, clearly, your first argument (a transform of X) is not single or double. So what is:
class(X)
If it's an integer type:
Xdouble = double(X);
th = mean(Xdouble(:)) + std(Xdouble(:));
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Guillaume
2016년 12월 13일
Without context it's impossible to say if it's correct or not. Certainly, if you want the standard deviation of your integers, you have to convert them to double. If an integer result is then required, you can convert the output back to uint16 (with the loss of precision that it entails).
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