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
>
> to explain what i wish to do, let's consider the following script
>
> from sympy import *
>
> u = symbols('u')
> der = symbols('der')
> e = symbols('e', cls=Function)(u)
> s = symbols('s', cls=Function)(e)
> Derivative(e,u) = der #essentially i would like to teach to sympy to use a
> symbol for the Derivative
> ---> but here i get "SyntaxError: can't assign to function call"
>
> print(diff(e,u))
> print(diff(s,e))
> print(diff(s,u)) #here i would like "der" to be replaced within the chain
> rule
>
> any suggestion would be very welcome...
>
> regards
> Riccardo
>
>
>
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