In which version should it be fixed ? In the dev one ? I'll try it. Thanks you.
Le vendredi 29 novembre 2013 21:54:13 UTC+1, Aaron Meurer a écrit : > > It's a bug in ratint. The bug should be fixed, but regardless, didn't > we make it so that integrate automatically pull out common > coefficients before it calls the algorithms? > > Aaron Meurer > > On Fri, Nov 29, 2013 at 9:07 AM, Ondřej Čertík > <[email protected]<javascript:>> > wrote: > > Hi Leryra, > > > > On Thu, Nov 28, 2013 at 3:16 PM, Leryra <[email protected] <javascript:>> > wrote: > >> Hi there ! > >> > >> I'm using Sympy in an extensive way to do some work on slow blow up > >> solutions of the critical wave equation, > >> The thing is that I stumbled accross this : > >> integrate(-3*sqrt(3)*(a**8 - 5*a**6 + 10*a**4 - 406*a**2 + > >> 224)/(4*a**2*(a**6 + 6*a**5 + 15*a**4 + 20*a**3 + 15*a**2 + 6*a + > 1)),a) > >> > >> And I can't get why sympy throw me some "PolynomialError: 1/(16*_t**2 + > >> 72*sqrt(3)*_t + 243) contains an element of the generators set" > >> > >> Could someone explain me this error ? Those are "just polynomials" and > the > >> integral doesn't look so ugly.. It has some log, but still... > > > > I think you found a bug. If you try the integral without the sqrt(3) > > at the beginning, it works: > > > >>>> integrate(-3*(a**8 - 5*a**6 + 10*a**4 - 406*a**2 + 224)/(4*a**2*(a**6 > + 6*a**5 + 15*a**4 + 20*a**3 + 15*a**2 + 6*a + 1)),a) > > 5 4 3 2 > > 3⋅a 40620⋅a + 182640⋅a + 317590⋅a + 259775⋅a + 89869⋅a + 6720 > > - ─── + ───────────────────────────────────────────────────────────── + > 1008⋅l > > 4 6 5 4 3 2 > > 40⋅a + 200⋅a + 400⋅a + 400⋅a + 200⋅a + 40⋅a > > > > > > 2007⋅log(a + 1) > > og(a) - ─────────────── > > 2 > > > > > > > > So we need to figure out what's going on and fix it. > > > > Ondrej > > > >> > >> -- > >> You received this message because you are subscribed to the Google > Groups > >> "sympy" group. > >> To unsubscribe from this group and stop receiving emails from it, send > an > >> email to [email protected] <javascript:>. > >> To post to this group, send email to [email protected]<javascript:>. > > >> Visit this group at http://groups.google.com/group/sympy. > >> For more options, visit https://groups.google.com/groups/opt_out. > > > > -- > > You received this message because you are subscribed to the Google > Groups "sympy" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] <javascript:>. > > To post to this group, send email to [email protected]<javascript:>. > > > Visit this group at http://groups.google.com/group/sympy. > > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
