Regarding the ValueError, this is expected behavior. You can only take
derivatives with respect to symbols and simple undefined functions
(like f(x)). See
http://docs.sympy.org/latest/modules/core.html#sympy.core.function.Derivative
Aaron Meurer
On Fri, Nov 11, 2016 at 1:15 PM, Riccardo Rossi
ping!
any more possible feedback on this?
thx in advance
Riccardo
On Friday, October 14, 2016 at 10:53:27 AM UTC+2, Riccardo Rossi wrote:
>
> Dear List,
>
> i am writing since i would like to define the output of the derivative of
> a function, and i don't have a clue of how to achieve it
>
What I am using right now dear Riccardo is the following:
Suppose that my variable sigma(define as a symbol) depends of u, but at the
same time this u is vectorial variable, which means for example in 3D the
variable will be : u = [u_0, u_1, u_2], all the components of u are defined
as
