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[Russell jarvis]

hmmm ... from Matlab

>> help sym

sym not found.

Use the Help browser Search tab to search the documentation, or
type "help help" for help command options, such as help for methods.

>>

The function you are attempting to use is part of Mathworks symbolic
toolbox, ... which is an embedded version of Maple.

Octave also has a symbolic "toolbox" ... which may meet your needs.

       http://octave.sourceforge.net/doc/funref_symbolic.html

Ben

Hey Ben,

I downloaded the files you linked to and put them in liboctave. Now
the function seems to work.

Thanks very much.

Russell.