Allow input parameter to be a function of time

[valentinsulzer]

(or add InputFunctionParameter object).

Not sure this is possible

Allow input parameter to be a function of time, without needing to re-discretize each time.

• arbitrary function of time doesn't seem possible as it requires re-discretising the tree each time.
• parametrized function already possible, e.g.

def linear(c):
   return InputParameter("a") + InputParameter("b") * c

then tune "a" and "b".

• interpolants could be done (e.g. for quickly evaluating different drive cycles). Would require re-building the casadi tree for each solve, but that's not too bad. Is there a way without rebuilding the tree?

[valentinsulzer]

Don't think this is possible. Stepping with constant parameters would be the closest thing, already possible