#17399: fix coefficients for symbolic series
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by rws:
Old description:
> There is no SR.function that gets the coefficients of SR.series; rather,
> `coeffs()` etc give confusing results; `truncate()` must be prepended
> manually.
> {{{
> sage: x=var('x')
> sage: s=(1/(1-x)).series(x,6)
> sage: s.coeffs()
> [[x^5 + x^4 + x^3 + x^2 + x + Order(x^6) + 1, 0]]
> sage: s.coefficient(4)
> 0
> }}}
> Working around with `s.truncate()` is only a fig leaf.
New description:
There is no SR.function that gets the coefficients of SR.series; rather,
`coeffs()` etc give confusing results; `truncate()` must be prepended
manually.
{{{
sage: x=var('x')
sage: s=(1/(1-x)).series(x,6)
sage: s.coeffs()
[[x^5 + x^4 + x^3 + x^2 + x + Order(x^6) + 1, 0]]
sage: s.coefficient(4)
0
}}}
Working around with `s.truncate()` is only a fig leaf.
Extracted from http://ask.sagemath.org/question/24968/coefficients-in-
polynomial-ring-over-symbolic-ring/
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Ticket URL: <http://trac.sagemath.org/ticket/17399#comment:1>
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