I agree with that remark. On 12 March 2012 07:18, Aaron Meurer <asmeu...@gmail.com> wrote: > I'm not sure about that. Doesn't that assume that a lambda expression > is going to return a floating point (or at least numeric) value? I agree with that remark.
> > Aaron Meurer > > On Thu, Feb 9, 2012 at 1:58 PM, krastanov.ste...@gmail.com > <krastanov.ste...@gmail.com> wrote: >> On 9 February 2012 21:39, Aaron Meurer <asmeu...@gmail.com> wrote: >>> I'm assuming you answered your own questions here with your symbolic >>> nsolve. Were there any issues that you didn't resolve? >> >> Just one issue: the sympification of lambda x : x >> >> Does it make sense for sympify(lambda x : x) to return an >> implemented_function with an _imp = lambda x: x? >> >> Otherwise the nsolve stuff is dealt with in the pull request for >> symbolic nsolve. >> >>> >>> Aaron Meurer >>> >>> On Tue, Jan 10, 2012 at 9:34 AM, krastanov.ste...@gmail.com >>> <krastanov.ste...@gmail.com> wrote: >>>> The problem of "python functions evaluate immediately sympy functions >>>> don't" >>>> is obvious when one tries to plot/lambdify something that contains both >>>> Expr >>>> and some numerical routine. Try to imagine a way to plot >>>> nsolve(..)*some_Expr for example. >>>> >>>> On 10 January 2012 17:30, krastanov.ste...@gmail.com >>>> <krastanov.ste...@gmail.com> wrote: >>>>> >>>>> Or more likely it's better to use implemented_function that is imported >>>>> from utilities.lambdify? >>>>> It seems to me that implemented_function is quite important if one wants >>>>> for example to have complicated numerical routines accessible as sympy >>>>> expressions. In my opinion it's actually important enough to be mentioned >>>>> in >>>>> the tutorial/pitfalls. Because defining a function to be used in sympy is >>>>> actually not as simple as defining a python function (python functions >>>>> evaluate immediately, sympy functions do not). >>>>> >>>>> Another question that I need help with is what is Lambda used for. Is >>>>> there something that Lambda does and implemented_function does not? >>>>> >>>>> >>>>> On 10 January 2012 16:39, krastanov.ste...@gmail.com >>>>> <krastanov.ste...@gmail.com> wrote: >>>>>> >>>>>> How can I represent an unevaluated call to nsolve as a sympy expression? >>>>>> Is Lambda the best (and standard) solution? >>>>>> >>>>>> The expression I want to represent looks like nsolve(x-tanh(x-h),[x],0). >>>>>> The free symbol is h. It's in the context of plotting phase transition >>>>>> diagrams. >>>>> >>>>> >>>> >>>> -- >>>> 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. >>> >> >> -- >> 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. > -- 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.
