Comment #9 on issue 1816 by [email protected]: Adding partial derivatives and taking derivatives with respect to functions
http://code.google.com/p/sympy/issues/detail?id=1816
I checked and Mathematica returns *exactly* what my Funcderiv branch does. Namely, it treats derivatives wrt functions no differently than regular symbols. I did other tests and Mathematica does not allow derivatives wrt arbitrary expressions, but does allow derivatives wrt other known functions like Sin/Cos. In fact, as far as I can tell, my Funcderiv branch implements Mathematica's algorithm exactly.
Also, in my experience derivatives wrt functions are almost always written in the "simple" notation that does not distinguish the "evaluated at the point" aspect of the definition. With these points in mind, I would like to move forward with merging my branch. It has a solid test suite and I think it is ready to go. Are there any other things that need to be addressed?
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