Updates:
Status: Valid
Labels: -Type-Defect Type-Enhancement Polynomial
Comment #1 on issue 4096 by [email protected]: Poly.coeff works only
after .simply().expand()
http://code.google.com/p/sympy/issues/detail?id=4096
Is p actually an instance of Poly, or just an expression?
The Expr.coeff does indeed require the expanded form (it is a very naive
structural coefficient). Probably we should implement the ability to grab
the coefficient efficiently from an unexpanded expression. I'm not sure if
it should be the same function or a different one. Surely a structural
coeff is useful to have.
Poly.coeff will work, though, because Poly expands the expression when it
is constructed.
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