solving set of inequalities

[mat95pat]

Hi, I'd like to solve set of inequalities with Octave, but I have no idea how
to do that. For example:

x1 + 2x2 <= 0
2x1 + 3x3 <= 0
x2 - x3 <= 0
x1 + x2 + x3 <=0

Does anybody know some function for solving this kind of problem, or method
with Octave?
Is possible to do that with Octave?

Thanks in advance
Petr
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