#14120: Add constant_coefficient method for Laurent polynomials
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Reporter: tscrim | Owner: tscrim
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.8
Component: algebra | Resolution:
Keywords: days45 | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Travis Scrimshaw | Merged in:
Dependencies: | Stopgaps:
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Comment (by tscrim):
Fixed doctests and added a general `__getitem__()` to retrieve the
coefficient by exponent value:
{{{
sage: P.<x,y> = LaurentPolynomialRing(QQ)
sage: f = (y^2 - x^9 - 7*x*y^3 + 5*x*y)*x^-3; f
-x^6 - 7*x^-2*y^3 + 5*x^-2*y + x^-3*y^2
sage: f[-2,3]
-7
sage: f.coefficient(x^-2*y^3)
-7
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14120#comment:2>
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