Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium
New issue 2558 by asmeurer: coeff() should allow x**0 (constant
coefficients)
http://code.google.com/p/sympy/issues/detail?id=2558
The way that coeff() works, you cannot get the constant coefficient.
Therefore, if you wanted to use it to get the coefficient of the terms of a
polynomial, for example, you cannot, because you can't get the coefficient
of 1 (something like (x + 1).coeff(1) gives x + 1, because both x and 1
and "coefficient" 1).
The solution that Maple and other systems use is to allow the syntax
coeff(expr, x, n) as the equivalent of coeff(expr, x**n), except that when
n is 0 it gets the constant term (with respect to x). So we should do the
same, redefining coeff as coeff(expr, x, n=None) (or maybe n should default
to 1).
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