Updates:
Labels: -NeedsReview NeedsBetterPatch
Comment #3 on issue 1660 by ondrej.certik: [PATCH] derivatives of composed
functions should not evaluate to a derivative in terms of a function
http://code.google.com/p/sympy/issues/detail?id=1660
First of all, thanks for the contribution and sorry for my late reply.
I agree that it should be improved. I disagree with removing the following
tests:
- assert f(x).diff(x) == Derivative(f(x), x)
- assert (f(x)**3).diff(x) == 3*f(x)**2*f(x).diff(x)
I think those are valid tests, aren't they? The discussable part is what to
do with
f(2*x).diff(x), etc.
I think we need to improve the Derivative class to be able to represent
derivatives
with respect to any point.
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