#13431: Add sign as an alias for signature for permutations
---------------------------------+------------------------------------------
Reporter: cremona | Owner: tbd
Type: enhancement | Status: positive_review
Priority: minor | Milestone: sage-5.4
Component: combinatorics | Resolution:
Keywords: permutation | Work issues:
Report Upstream: N/A | Reviewers: Rob Beezer
Authors: Kevin Halasz | Merged in:
Dependencies: | Stopgaps:
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Changes (by {'newvalue': u'Kevin Halasz', 'oldvalue': ''}):
* status: needs_work => positive_review
* reviewer: => Rob Beezer
* author: => Kevin Halasz
Old description:
> As I reported on sage-devel:
> {{{
> sage: pi = permutations(4)[4]
> sage: pi.signature()
> 1
> sage: pi.sign()
> ...
> AttributeError: 'Permutation_class' object has no attribute 'sign'
> }}}
> and as was also mentioned:
> {{{
> sage: G = SymmetricGroup(2)
> sage: a = G("(1,2)")
> sage: a.sign()
> -1
> }}}
>
> The proposal is to add sign as an alias to signature for the class
> 'sage.combinat.permutation.Permutation_class' by adding a single line to
> sage/combinat/permutation.py saying "sign = signature"
New description:
As I reported on sage-devel:
{{{
sage: pi = permutations(4)[4]
sage: pi.signature()
1
sage: pi.sign()
...
AttributeError: 'Permutation_class' object has no attribute 'sign'
}}}
and as was also mentioned:
{{{
sage: G = SymmetricGroup(2)
sage: a = G("(1,2)")
sage: a.sign()
-1
}}}
The proposal is to add sign as an alias to signature for the class
'sage.combinat.permutation.Permutation_class' by adding a single line to
sage/combinat/permutation.py saying "sign = signature"
'''Apply''':
1. [attachment:13431_signadd-v2.patch]
--
Comment:
Looks good! Positive review.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13431#comment:6>
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