Comment #1 on issue 3582 by [email protected]: The chain rule should
take derivatives with respect to functions when it can
http://code.google.com/p/sympy/issues/detail?id=3582
Having the same issue I think. In the simplest case:
x = Symbol('x')
g = Function('g')
f = Function('f')
dfdg = f(g(x)).diff(g(x))
print dfdg
print dfdg.doit()
outputs,
Subs(Derivative(f(_xi_2), _xi_2), (_xi_2,), (g(x),))
Subs(Derivative(f(_xi_2), _xi_2), (_xi_2,), (g(x),))
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