#19737: SetPartition.to_permutation().cycle_tuples() is not the identity
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Reporter: mantepse | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.0
Component: combinatorics | Resolution:
Keywords: set partitions, | Merged in:
permutations | Reviewers: Nathann Cohen
Authors: Martin Rubey | Work issues:
Report Upstream: N/A | Commit:
Branch: | c6a3939d2e18efe3906e1f959dc5c019c921a944
u/mantepse/setpartition_to_permutation___cycle_tuples___is_not_the_identity|
Stopgaps:
Dependencies: |
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Comment (by mantepse):
No, I hate python because, in my opinion, it lacks a lot of functionality
and it is very complicated at the same time.
For example, in Aldor I can simply say: if the parameters are the integers
from 1 to n, then export the method "to_permutation" (i.e., make it
visible to the user). Otherwise, do not export this method.
> Or, lacking this, the possibility to have a function and a class of the
same name, eg., {{{SetPartition}}} would be a function that return an
instance of a class of the *same* name, or an instance of
{{{IntegerSetPartition}}}.
That's what I call making things complicated. Can't people live with
classes that return instances of themselves?
OK, but you said you don't like {{{SetPartition}}} having methods that do
not apply to all its instances. Or would you prefer to type
{{{IntegerSetPartition}}} all the time, and make {{{SetPartition([[1]])}}}
and {{{IntegerSetPartition([[1]])}}} different objects?
> I added a small commit at public/19737. If you agree with it, please add
it to this ticket and set the status to positive_review.
I do not have proper access to git from this computer. Your change is of
course OK, so if you don't want to wait until tomorrow, please merge and
set it to positive review.
Thanks!
--
Ticket URL: <http://trac.sagemath.org/ticket/19737#comment:29>
Sage <http://www.sagemath.org>
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