Re: Distinguishing Octave from Matlab

[José Luis García Pallero]

I usually use a function like this:

function [inOctave] = in_octave()
try
    OCTAVE_VERSION;
    inOctave = 1;
catch
    inOctave = 0;
end

What is the difference with the persistent inout = exist("OCTAVE_VERSION","builtin") != 0; version?

Is the evaluation of exist() function faster than OCTAVE_VERSION and try-catch statement?

2009/2/19 John W. Eaton <address@hidden>

On 19-Feb-2009, José Luis García Pallero wrote:

| Here, you have possible solutions:
|
| http://www-old.cae.wisc.edu/pipermail/help-octave/2007-April/003809.html
| http://www-old.cae.wisc.edu/pipermail/help-octave/2007-May/003814.html

Probably the best solution is something similar to David's suggestion of:

 function in = inoctave ()
   persistent inout = exist("OCTAVE_VERSION","builtin") != 0;
   in = inout;
 endfunction

but that won't work in Matlab, so you'll need to write it as

 function retval = inoctave ()
   persistent inout;
   if (isempty (inout))
     inout = exist ('OCTAVE_VERSION', 'builtin') ~= 0;
   end
   retval = inout;
 end


If this isn't in the FAQ, it should be.

jwe

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José Luis García Pallero
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