Comment #16 on issue 1620 by renato.c...@gmail.com: Allow derivatives of
unknown functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
I started trying to use the simpler approach, creating a new class, it's in
my branch renatocoutinho/eval_deriv, or better:
https://github.com/renatocoutinho/sympy/commit/752a2bbcfe961f0e0cae0ac980a0d958d217a16b
It's missing tests and there are several test fails (matching, subs and
ode). This works mostly as a wrapper for Derivative.
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