[bug #67905] [image] graycomatrix does not handle NaN consistently and correctly

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Update of bug #67905 (group octave):

                 Release:                  10.3.0 => other
                 Summary: [image] graycomatrix does not handle NaN
consistently.   => [image] graycomatrix does not handle NaN consistently and
correctly

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Follow-up Comment #10:

According to MATLAB documentation, graycomatrix ignores NaN values, replaces
+Infs with the value NumLevels, and replaces -Infs with the value 1.

I have checked the example on Windows.
1. With 'use_oct' = true, there is no error message, but the result is wrong.
Should be:

>> [glcm,SI] = graycomatrix(I)

glcm =

   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   0
   0   0   0   0   0   0   0   7

SI =

     8     8     8     8     8
     8     8     8     8   NaN

glcm(8,1) should be 0 and not 1.

2. With 'use_oct' = False we get an error message

In any case we need a special treatment for the case of NaN values. Maybe some
masking should be done.




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