Preparing functions of 2 variables with respect to just one. #286
Description
In control-toolbox/CTBase.jl#140 (comment) @ocots asked whether it is possible to prepare a function f(x, p) = y where x won't change but p will. This is not built into the package but I'm opening an issue to keep track of potential workarounds.
Also related to the Lagrangian topic from #206 (comment) and #252 (comment), ping @timholy