I have some problem with the derivative of the 'conjugate' expression: Here I define the functions:
f[x_, y_] := x + I y;
g[x_, y_] := x + 3 I y y;
h[x_, y_] := Derivative[0, 1][f[#, #2]\[Conjugate]/g[#, #2] &][x, y]
When I try to evaluate one of the expression, for example
h[1, 1]
I got something like
Derivative[1][Conjugate][1 + I]
which is not true. If I try the code suggested in Derivative of conjugate multivariate function
excluded =
"ExcludedFunctions" /. ("DifferentiationOptions" /.
SystemOptions["DifferentiationOptions"])
SetSystemOptions[
"DifferentiationOptions" ->
"ExcludedFunctions" -> Union[excluded, {Conjugate}]]
I got the error
General::ivar: 1 is not a valid variable.