Oh sick - intervals are exactly what I'm looking for. Thanks! On Thursday, 25 July 2013 22:39:36 UTC+10, Matthew wrote: > > > Since it's for my own purposes I really could represent it with nested >> lists/tuples, using booleans to include a value or not: >> >> [[(-sympy.oo, False), (-1, True)], [(0, False), (sympy.oo, True)]] >> >> which represents (-inf, -1] U (0, inf) >> > > For this all you need is sets. Note that they use False/True to mean > openness, not inclusion. > > In [4]: Interval(-oo, -1, True, False) + Interval(0, oo, True, True) > Out[4]: (-∞, -1] ∪ (0, ∞) > > >> which would work fine for my purposes. However I'm pretty sure with what >> I plan to do I'm going to be using domains a fair bit more in the future so >> if I have something that is going to work with what SymPy has planned then >> it may help. >> > > I suspect that we're overengineering things. If all you need is to > represent sets then SymPy should have you covered. If you also need to > attach each set to a particular symbol (like x or y) then we run into new > territory. >
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