On Mar 16, 2:23 am, "Nick Alexander" <[EMAIL PROTECTED]> wrote:
> Is this because of precision issues? In that case, I still think this
> should return [(1.0000..., 1), (1.0000...., 1)] and be documented as
> such.
>
> sage: (CC(1)*(x-1)**2).roots()
> [1.00000000000000, 1.00000000000000]
>
> sage: ((x-1)**2).roots()
> [(1, 2)]
2 here refers to multiplicity. The result of roots() are fine, it's
the behavior accross fields that is inconsistent.
The docs for roots() over QQ say:
{{{
Return all roots of this polynomial.
INPUT:
multiplicities -- bool (default: True, except over RR
or CC)
if True return list of pairs (r, n),
where r is
the root and n is the multiplicity.
}}}
HTH,
didier
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