#10761: Numerical approximation of an algebraic number raises a ValueError
-----------------------------+----------------------------------------------
Reporter: slabbe | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.2
Component: PLEASE CHANGE | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Numerical approximation works for complex numbers:
{{{
sage: n(1 + I)
1.00000000000000 + 1.00000000000000*I
sage: (1 + I).n()
1.00000000000000 + 1.00000000000000*I
}}}
but not for algebraic numbers:
{{{
sage: m = matrix(3, [3,1,6,5,2,9,7,3,13])
sage: E = m.eigenvalues()
sage: E
[18.16815365088822?, -0.08407682544410650? - 0.2190261484802906?*I,
-0.08407682544410650? + 0.2190261484802906?*I]
sage: map(type, E)
[<class 'sage.rings.qqbar.AlgebraicNumber'>, <class
'sage.rings.qqbar.AlgebraicNumber'>, <class
'sage.rings.qqbar.AlgebraicNumber'>]
sage: map(n, E)
Traceback (most recent call last):
...
ValueError: Cannot coerce algebraic number with non-zero imaginary part to
algebraic real
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10761>
Sage <http://www.sagemath.org>
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