#17922: coefficients() function more consistent between Expressions and
polynomial
rings
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Reporter: JoalHeagney | Owner:
Type: enhancement | Status: new
Priority: minor | Milestone: sage-6.6
Component: algebra | Resolution:
Keywords: coeffs, rings, polynomials, | Merged in:
expression, symbolic | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by rws):
Replying to [comment:3 JoalHeagney]:
> That works for polynomial rings, are there plans to add that to
sage.symbolic.expression.Expressions?
That would not be difficult (in comparison). If you expect it then to
behave identically you will be disappointed however, because symbolics
have no default generator (although `Expression.coefficients()` has the
lexically first occuring var hard-wired when no varname is given).
{{{
sage: var('a,b,c')
(a, b, c)
sage: (a+2*a^2+3*b).list()
[3*b, 1, 2]
sage: (3*b+a+2*a^2).list()
[3*b, 1, 2]
sage: (3*b+c+2*c^2).list()
[2*c^2 + c, 3]
}}}
so you could never have true polymorphism.
--
Ticket URL: <http://trac.sagemath.org/ticket/17922#comment:5>
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