On Jun 26, 8:35 am, Toon Verstraelen <toon.verstrae...@ugent.be> wrote: > Vinzent Steinberg wrote: > > On Jun 25, 8:33 am, Toon Verstraelen <toon.verstrae...@ugent.be> > > wrote: > >> In [15]: ccode(integrate(sin(x)/x,x)) > >> Out[15]: Integral(sin(x)/x, x) > > >> This should always raise an exception. Such a thing is never ever going > >> to be compilable. > > > We could use a library (maybe sepcified by the user) that can evaluate > > Integrals numerically. > > Thanks for all the helpful comments. The numerical integration is a bit > troublesome, and probably something we can not fix at the ccode level. C does > not support lambda functions or functions defined inside other functions. In > this case sin(x)/x should have been defined elsewhere as a separate function. > Then the numerical integration routine can take a pointer to that function as > a > first argument. (It's a C problem and can be done in other languages like > Python.) > I'm afraid that the current ccode/codegen design does not allow this kind of > features for some languages, and a more holistic approach would be necessary. > (where ccode and codegen are merged in one module, somthing like the work of > Marc Dewing). I also think it is a bit beyond my current intentions with > codegen. The original idea was to let it implement lenghtly formula's that no > one wants to code by hand. > I would suggest to raise a NotImplementedError, until we find an appropriate > solution.
Surely, this would be a quite advanced feature, we should not yet care about it. But it would be possible I think. (It would involve determining the function to integrate and creating a generic C function, depending on the interface.) Vinzent --~--~---------~--~----~------------~-------~--~----~ 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 sympy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy?hl=en -~----------~----~----~----~------~----~------~--~---
