Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3928 by asmeu...@gmail.com: Disable diff_wrt on non-undefined
Functions
http://code.google.com/p/sympy/issues/detail?id=3928
We currently have
In [6]: diff(cos(x), sin(x))
Out[6]: 0
But this confuses people, especially things like
In [7]: diff(x, re(x))
Out[7]: 0
In [8]: diff(x, conjugate(x))
Out[8]: 0
We should disable diff_wrt except on undefined functions, like
Function('f'), and their derivatives.
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