I tried both of those options and had no luck :( Have you looked at the paper by Fu, Zhong, and Zeng: http://vv.cn/d/d.aspx?Id=21987_1.0.42119
I read it, and think it seemed reasonable, but I'm no expert and want to see what else was out there... maybe there are other approaches worth considering. Before investing in a lot of coding time, it would nice to be sure that a good algorithm is being used, although I must say their comparisons with the other popular packages out there seem favorable. ~Luke On May 20, 7:50 am, Alan Bromborsky <abro...@verizon.net> wrote: > Luke wrote: > > Last night I was deriving the moment of inertia for a solid torus > > using Sympy. It mostly worked, except for the step where the > > determinant of the Jacobian for the change of variables mapping was to > > be computed, the result was unable to be simplified by trigsimp. I > > gave it a shot anyway, and it resulted in integrate() stalling on the > > triple integral that is necessary. Using other means to compute the > > Jacobian of the determinant, then using that result in integrate() > > resulted in the correct solution for the moment of inertia, which is > > comforting, but at the same time, really makes me want to get trigsimp > > to work better. > > > I know of the paper by Fu, Zhong, and Zeng, but I was wondering if > > anybody had any other recommendations for approaches to trigonometric > > simplification. It would be really nice if this part of sympy worked > > better. If there is somebody else out there who would like to tackle > > this together, let me know and we could figure out a reasonable > > approach. > > > Thanks, > > ~Luke > > Did you try the deep and recursive switches on the most recent version > of trigsimp. I also would like trigsimp to do better for the same > reasons you gave and would also like it to apply to hyperbolic trig > functions. One thing I would do for trigsimp is to convert all trig > functions in the expression to sin's and cos's before simplifying. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
