Sets: predicate notation in Octave

[Hugh Mayfield]

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Hi there,

I mentioned this in the IRC channel but the girls / guys there didn't
know, so asking again here.  Have had a look at the manual and FAQ.

I have Maths coursework to do over the holidays.  One of the questions
involves working with sets: working out intersections and
subtractions.  The difficult bit is working out how to tell Octave
what the various subsets contain, without spelling it out value by
value (don't think lecturer would be impressed with that).  One of the
subsets is something like (in mathematical notation, which I don't
think I can reproduce in a plain text email):

        (x: x > 0, x <= 30, x is a member of set N)

where "N" is the symbol representing the natural numbers.

If someone could help me out with how to code this in Octave, would be
really grateful.  I'm trying to make a stand on campus against
proprietary software, and we are required to use online solvers or
mathematical software to evidence our work, so really hoping to use
Octave.

Regards,

Hugh

- -- 
Hugh Mayfield
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