#20491: WeightedIntegerVector returns vectors of rationals, not integers
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Reporter: cnassau | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.2
Component: combinatorics | Resolution:
Keywords: steenrod algebra | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by jhpalmieri):
* component: algebraic topology => combinatorics
Old description:
> The following regression seems to be new in Sage7.2.beta5:
>
> {{{
> sage: A=SteenrodAlgebra(2)
> sage: for x in A.basis(d=1): print x,x*x
> TypeError Traceback (most recent call
> last)
> ...
> TypeError: unsupported operand type(s) for &: 'int' and
> 'sage.rings.rational.Rational'
> }}}
>
> Source of the problem seems to be that `steenrod_algebra_basis` returns
> Rational as entries:
>
> {{{
> sage: ((x,),) = steenrod_algebra_basis(1)
> sage: print x,type(x)
> 1 <type 'sage.rings.rational.Rational'>
> }}}
New description:
The following regression seems to be new in Sage7.2.beta5:
{{{
sage: for x in WeightedIntegerVectors(1, [1]): print type(x[0])
<type 'sage.rings.rational.Rational'>
}}}
--
Comment:
I think this happens in `WeightedIntegerVectors`. I've changed the ticket
description accordingly.
--
Ticket URL: <http://trac.sagemath.org/ticket/20491#comment:2>
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