Hi, when I was at high school I remember figuring out how to factor this:
In [1]: 2*x*y*z + x*y**2 + x*z**2 + y*x**2 + y*z**2 + z*x**2 + z*y**2 Out[1]: 2 2 2 2 2 2 2*x*y*z + x*y + x*z + y*x + y*z + z*x + z*y If you don't know the result, which you don't, it's actually pretty difficult. It took us couple hours with friens. Well, in pure Python you can do just this: In [2]: %time factor(_) CPU times: user 2.66 s, sys: 0.00 s, total: 2.66 s Wall time: 2.67 s Out[3]: (x + y)*(y + z)*(x + z) Not bad. However the time varies a lot on my laptop if I repeat it in another ipython session -- from 0.7s (!) to 8s. Can anyone verify this please? You need the latest hg sympy. Why is that? To make Sage guys happy after the debackle with pi.evalf(10**6): sage: var("y z") (y, z) sage: 2*x*y*z + x*y**2 + x*z**2 + y*x**2 + y*z**2 + z*x**2 + z*y**2 y*z^2 + x*z^2 + y^2*z + 2*x*y*z + x^2*z + x*y^2 + x^2*y sage: %time factor(_) CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s Wall time: 0.01 s (y + x)*(z + x)*(z + y) I think it uses Maxima, but I may be wrong. In any case we still need to improve, but I am glad sympy can already do it, instead of hanging. Ondrej --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sympy?hl=en -~----------~----~----~----~------~----~------~--~---