Indeed I know how to test is an expression is a ploynom regarding to one variable. The use of ces() will solve my problem.
Thanks a lot. Christophe. ================================================================== Aaron S. Meurer a écrit : > Use cse() (common subexpression elimination). It will replace the > logs with dummy variables, which you can then see is a polynomial. > In [8]: cse((log(x) + 1)-((log(x)**3+7))) > Out[8]: ([(x0, log(x))], [-6 + x0 - x0**3]) > > I think you can then tell that this is a Polynomial by trying to > instantiate a Poly class with it and seeing if it raises an error, but > there is probably a better way than this. > > Aaron Meurer > On Jul 15, 2009, at 5:43 AM, Christophe wrote: > > >> Hello, >> I would like to know that for example (log(x) + 1)-((log(x)**3+7) is a >> polynom of log(x). How can I do ? >> >> Best regards. >> Christophe. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
