Just bin/isympy (or whatever you use) with this in the environment. E.g.:
SYMPY_DEBUG=True bin/isympy On 20.04.2012 11:45, gsagrawal wrote:
one quick question .. how to set SYMPY_DEBUG=True ? On Fri, Apr 20, 2012 at 2:31 PM, Tom Bachmann <e_mc...@web.de <mailto:e_mc...@web.de>> wrote: Absolutely! git pull https://github.com/ness01/__sympy <https://github.com/ness01/sympy> trigsimp The function is called trigsimp_groebner. But please note that I only wrote it yesterday, so there are probably bugs. Also there is no real docstring (yet). Quick tips: - run with SYMPY_DEBUG=True in order to see what is happening / if it hangs - pass quick=True if it hangs at "minsolve: ..." - use hints=[...]. This really should be in the docstring. Basically put in in what you think the answer should involve. E.g. trigsimp_groebner(sin(x)*cos(__x)) does nothing. Passing hints=[sin(2*x)] works. Also hints=[2] does something similar (but is way more expensive). Try hints=[tan] to enable looking for tan expressions (only necessary if they are not in the input). hints=[(sin, x, y)] will try to use the sin(x+y)=sin(x)cos(y) + sin(y)cos(x) formula. - hyperbolic function simplification does not work, yet Hope this helps. Tom On 20.04.2012 09:23, gsagrawal wrote: i want to evaluate this function . can you tell me which branch i need to checkout ? On Fri, Apr 20, 2012 at 1:37 PM, Tom Bachmann <e_mc...@web.de <mailto:e_mc...@web.de> <mailto:e_mc...@web.de <mailto:e_mc...@web.de>>> wrote: That could be true. The groebner algorithms actually use a minimal sparse representation internally. But running trigsimp_groebner on smallExpr for me hangs on "a * d_hat - b * c_hat" - (not even the conversion to sparse or reduction, yet) just a multiplication of (huge) polys. As I said, I'll run some timing tests to figure out the bottleneck. But I'm not sure this algorithm can work with such huge expressions. Even the "staircase" function (which just enumerates all monomials below a certain degree) takes ages (I am not sure why, yet. The dense representation does not seem to be a problem.) On 20.04.2012 08:53, Aaron Meurer wrote: I just remembered something important (I'm not sure why I forgot about it before). It's going to be slow with multiple generators simply because the polys are slow with multiple generators. This is because the recursive dense representation used in the polys is highly inefficient for polynomials over many variables. This is because as a "dense" representation, it tends to waste a lot of space, and as a "recursive" representation, many of the functions are literally written recursively, which is expensive in Python (take dmp_mul for example). So we really need to work toward a sparse representation in the polys to start to get a real speedup here. Aaron Meurer On Fri, Apr 20, 2012 at 1:29 AM, Tom Bachmann<e_mc...@web.de <mailto:e_mc...@web.de> <mailto:e_mc...@web.de <mailto:e_mc...@web.de>>> wrote: I tried the expressions from https://groups.google.com/d/____topic/sympy/3y6orHV2_4k/____discussion <https://groups.google.com/d/__topic/sympy/3y6orHV2_4k/__discussion> <https://groups.google.com/d/__topic/sympy/3y6orHV2_4k/__discussion <https://groups.google.com/d/topic/sympy/3y6orHV2_4k/discussion>> (see the tarball linked to in the first post). I just tried the small expression with n=1, but it just hung on the reduction step. Any thoughts on how to make this faster? Those expressions would make good stress tests for this. Well these expressions are *huge*. I will run some timing tests, but I think all parts of the algorithm will break down (i.e. become infeasible computationally) long before that length. -- 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 <mailto:sympy@googlegroups.com> <mailto:sympy@googlegroups.com <mailto:sympy@googlegroups.com>__>. To unsubscribe from this group, send email to sympy+unsubscribe@__googlegrou__ps.com <http://googlegroups.com> <mailto:sympy%2Bunsubscribe@__googlegroups.com <mailto:sympy%252bunsubscr...@googlegroups.com>>. For more options, visit this group at http://groups.google.com/____group/sympy?hl=en <http://groups.google.com/__group/sympy?hl=en> <http://groups.google.com/__group/sympy?hl=en <http://groups.google.com/group/sympy?hl=en>>. -- 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 <mailto:sympy@googlegroups.com> <mailto:sympy@googlegroups.com <mailto:sympy@googlegroups.com>__>. To unsubscribe from this group, send email to sympy+unsubscribe@__googlegrou__ps.com <http://googlegroups.com> <mailto:sympy%2Bunsubscribe@__googlegroups.com <mailto:sympy%252bunsubscr...@googlegroups.com>>. For more options, visit this group at http://groups.google.com/____group/sympy?hl=en <http://groups.google.com/__group/sympy?hl=en> <http://groups.google.com/__group/sympy?hl=en <http://groups.google.com/group/sympy?hl=en>>. -- 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 <mailto:sympy@googlegroups.com>. To unsubscribe from this group, send email to sympy+unsubscribe@__googlegroups.com <mailto:sympy%2bunsubscr...@googlegroups.com>. For more options, visit this group at http://groups.google.com/__group/sympy?hl=en <http://groups.google.com/group/sympy?hl=en>. -- 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 <mailto:sympy@googlegroups.com>. To unsubscribe from this group, send email to sympy+unsubscribe@__googlegroups.com <mailto:sympy%2bunsubscr...@googlegroups.com>. For more options, visit this group at http://groups.google.com/__group/sympy?hl=en <http://groups.google.com/group/sympy?hl=en>. -- 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.
-- 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.
