(octave.info)How to Distinguish Between Octave and Matlab

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D.4 How to Distinguish Between Octave and Matlab
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Octave and MATLAB are very similar, but handle Java slightly different.
Therefore it may be necessary to detect the environment and use the
appropriate functions.  The following function can be used to detect the
environment.  Due to the persistent variable it can be called repeatedly
without a heavy performance hit.

   Example:

     %%
     %% Return: true if the environment is Octave.
     %%
     function retval = isOctave
       persistent cacheval;  % speeds up repeated calls

       if isempty (cacheval)
         cacheval = (exist ("OCTAVE_VERSION", "builtin") > 0);
       end

       retval = cacheval;
     end