#18390: cleanup variable factories
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.7
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by vdelecroix:
Old description:
> The `PolynomialRing` factory is written in a very complicated way and is
> slightly different to `FreeAlgebra`. In this ticket, we normalize the
> inputs of all factories involving variables.
>
> Some changes are noticeable
>
> 1. the following will now raise `TypeError`
> {{{
> sage: R.<a,b> = PolynomialRing(QQ, ('a', 'b'))
> sage: A.<x,y,z> = FreeAlgebra(QQ, 'x,y,z')
> }}}
>
> 2. The `var_array` argument in `PolynomialRing` is deprecated
>
> As a sided effect, we got some speedup in polynomial ring creation!
New description:
The `PolynomialRing` factory is written in a very complicated way and is
slightly different to `FreeAlgebra`. In this ticket, we normalize the
inputs of all factories involving variables.
Some changes are noticeable
1. the following will now raise `TypeError`
{{{
sage: R.<a,b> = PolynomialRing(QQ, ('a', 'b'))
sage: A.<x,y,z> = FreeAlgebra(QQ, 'x,y,z')
}}}
2. The many versions are `normalize_names` are fused in
`sage.misc.variables.normalize_names`
3. Deprecations:
- the `var_array` argument in `PolynomialRing`
- the methods `normalize_names`, `_certify_name` of `CategoryObject`
As a sided effect, we got some speedup in polynomial ring creation!
--
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Ticket URL: <http://trac.sagemath.org/ticket/18390#comment:2>
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