Isn't the solution simply to provide a class Jacobi, that is not evaluated, and a function jacobi(), that does what it does now?
Ondrej On Wed, Feb 5, 2014 at 4:38 PM, Matthew Rocklin <mrock...@gmail.com> wrote: > Although, I don't know much about the polynomials module. It may be > possible to resolve the problem there without tackling the problem at large. > > > On Wed, Feb 5, 2014 at 3:29 PM, Matthew Rocklin <mrock...@gmail.com> wrote: >> >> Unwanted automatic evaluation comes up fairly frequently on the listhost. >> It's on our radar but there hasn't been much movement on the issue lately. >> It requires a concerted effort by someone with some time. >> >> >> > is there wider interest in such a feature? >> Absolutely. >> >> >> On Wed, Feb 5, 2014 at 2:54 PM, Freddie Witherden <fred...@witherden.org> >> wrote: >>> >>> Hi all, >>> >>> In SymPy is there any way of stopping orthogonal polynomials from >>> automatically simplifying down to concrete expressions? So for: >>> >>> sy.jacobi_normalized(2, 0, 1, x) >>> >>> to give: >>> >>> sqrt(6)/3*jacobi(2, 0, 1, x) >>> >>> as opposed to: >>> >>> sqrt(6)*(5*x**2/2 - x - 1/2)/2 >>> >>> I have a use-case where it is highly desirable for polynomials to be >>> kept in the above form (as it permits more efficient/numerically stable >>> evaluations later on). Other than keeping n as a Symbol is this >>> currently possible? If not---and I suspect, from a quick glance over >>> the source code that it isn't!)---is there wider interest in such a >>> feature? >>> >>> Regards, Freddie. >>> >> > > -- > 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 sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > 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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
