On Fri, Apr 9, 2010 at 1:07 PM, Ben Goodrich <goodrich....@gmail.com> wrote: > On Apr 9, 3:09 pm, Ondrej Certik <ond...@certik.cz> wrote: >> >> And if this helps, we can then try to think how to make this >> automatic, so that you can just write: >> >> first * second - third**2 >> >> and it will be the same fast. >> >> Ondrej > > Okay, I had already assumed that if first * second - third**2 was > inside quo() like > > quo(first * second - third**2, fourth) > > that it would decide how to expand the numerator optimally, but maybe > not quite yet. > > I see that sympy/sympy/polyclasses.py has a Dense Multivariate > Polynomial class with methods that overload mul, sub, and sqr, which > hopefully the following utilizes > > quo(Poly(first, domain='QQ') * Poly(second, domain='QQ') - Poly(third, > domain='QQ')**2, Poly(fourth, domain='QQ'))
You can check the Poly.__mul__ methods just to be sure what is happening inside. > > So far, that is only using a small amount of RAM, but it is still > calculating. I will report back when it finishes or errors. Yep, report back. Ondrej -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sy...@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
