#19947: conversion SR to asymptotic ring
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Reporter: cheuberg | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: asymptotic expansions | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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It should be possible to convert a symbolic expression to an asymptotic
expansion:
{{{
sage: A.<x1> = AsymptoticRing('x^QQ', QQ)
sage: A(x^2+x+1)
sage: A((x + 1)/(x - 1))
Traceback (most recent call last):
...
ValueError: (x + 1)/(x - 1) is not in Exact Term Monoid x^QQ with
coefficients in Rational Field.
> *previous* ValueError: Factor x + 1 of (x + 1)/(x - 1) is neither a
coefficient (in Rational Field) nor growth (in Growth Group x^QQ).
sage: ((x+1)/(x-1)).subs(x=x1)
Traceback (most recent call last):
...
TypeError: no canonical coercion from Asymptotic Ring <x^QQ>
over Rational Field to Symbolic Ring
}}}
Substitution is probably harder than conversion. Related to #19429.
--
Ticket URL: <http://trac.sagemath.org/ticket/19947>
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