On related note. Is this a but / missing feature? In [69]: sympify(lambda x: x) SympifyError: SympifyError: "could not parse u'<function <lambda> at 0x4a4bed8>'"
On 10 January 2012 17:34, 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.
