Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 1644 by pavelpo: Coeff() with derivatives and functions
http://code.google.com/p/sympy/issues/detail?id=1644
First post, please be gentle.
It seems that coeff() doesn't work as it should (?) for expressions with a
mix of functions and their derivatives:
f = Function('f')
x = Symbol('x')
g = 2*f(x) + 3*f(x).diff(x) + 4*f(x).diff(x,2)
g.coeff(f(x).diff(x)) # works
Output: 3
g.coeff(f(x).diff(x,2)) # works
Output: 4
g.coeff(f(x)) # doesn't work as expected
Output: 9
Shouldn't it be "2" for the last line?
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