#14138: some cleanup in sage.combinat.combinat
---------------------------------+------------------------------------------
Reporter: ncohen | Owner: sage-combinat
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.8
Component: combinatorics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Punarbasu Purkayastha
Authors: Nathann Cohen | Merged in:
Dependencies: | Stopgaps:
---------------------------------+------------------------------------------
Description changed by ncohen:
Old description:
> Because I hate that :
>
> {{{
> sage: MultichooseNK(5,3)
> Combinatorial Class -- REDEFINE ME!
>
> sage: Partitions(5, min_part=0)
> /home/ncohen/.Sage/local/lib/python2.7/site-
> packages/sage/combinat/partition.py:3764: RuntimeWarning: Currently,
> setting min_part=0 produces Partition objects which violate internal
> assumptions. Calling methods on these objects may produce errors or
> WRONG results!
> warn("Currently, setting min_part=0 produces Partition objects which
> violate internal assumptions. Calling methods on these objects may
> produce errors or WRONG results!", RuntimeWarning)
> Partitions of the integer 5 satisfying constraints min_part=0
>
> sage: Compositions(5, min_part=0)
> /home/ncohen/.Sage/local/lib/python2.7/site-
> packages/sage/combinat/composition.py:975: RuntimeWarning: Currently,
> setting min_part=0 produces Composition objects which violate internal
> assumptions. Calling methods on these objects may produce errors or
> WRONG results!
> warn("Currently, setting min_part=0 produces Composition objects which
> violate internal assumptions. Calling methods on these objects may
> produce errors or WRONG results!", RuntimeWarning)
> Compositions of the integer 5 satisfying constraints min_part=0
> }}}
>
> From the help of unordered_tuples (in the global namespace):
>
> Warning: Wraps GAP - hence mset must be a list of objects that have
> string
> representations that can be interpreted by the GAP interpreter.
> If mset consists of at all complicated Sage objects, this
> function does *not* do what you expect. A proper function should
> be written! (TODO!)
>
> From the help of permutations_iterator (in the global namespace, with no
> depracation warning):
>
> Do not use this function. It will be deprecated in future version
> of Sage and eventually removed. Use Permutations instead;
>
> help of number_of_permutations (same as above) :
New description:
Because I hate that :
{{{
sage: MultichooseNK(5,3)
Combinatorial Class -- REDEFINE ME!
sage: Partitions(5, min_part=0)
/home/ncohen/.Sage/local/lib/python2.7/site-
packages/sage/combinat/partition.py:3764: RuntimeWarning: Currently,
setting min_part=0 produces Partition objects which violate internal
assumptions. Calling methods on these objects may produce errors or WRONG
results!
warn("Currently, setting min_part=0 produces Partition objects which
violate internal assumptions. Calling methods on these objects may
produce errors or WRONG results!", RuntimeWarning)
Partitions of the integer 5 satisfying constraints min_part=0
sage: Compositions(5, min_part=0)
/home/ncohen/.Sage/local/lib/python2.7/site-
packages/sage/combinat/composition.py:975: RuntimeWarning: Currently,
setting min_part=0 produces Composition objects which violate internal
assumptions. Calling methods on these objects may produce errors or WRONG
results!
warn("Currently, setting min_part=0 produces Composition objects which
violate internal assumptions. Calling methods on these objects may
produce errors or WRONG results!", RuntimeWarning)
Compositions of the integer 5 satisfying constraints min_part=0
}}}
From the help of unordered_tuples (in the global namespace):
Warning: Wraps GAP - hence mset must be a list of objects that have
string
representations that can be interpreted by the GAP interpreter.
If mset consists of at all complicated Sage objects, this
function does *not* do what you expect. A proper function should
be written! (TODO!)
From the help of permutations_iterator (in the global namespace, with no
depracation warning):
Do not use this function. It will be deprecated in future version
of Sage and eventually removed. Use Permutations instead;
help of number_of_permutations (same as above).
What this ticket does :
* It adds a deprecation warning when `min_part = 0`, in the hope that the
feature will be made unavailable as soon as possible, and because Nicolas
told me that I should deprecate it first (turns out that there has been a
warning since 2009 already).
* It calls the proper Sage object to compute things that use to be done
with GAP
* Some documentation improvements.
* This ticket *does nothing* about `MultichooseNK(5,3)` because I refuse
to touch anything that uses things like CombinatorialClass.
* This ticket does *not* remove all the functions `number_of_*` that are
imported in the global namespace by a `from sage.combinat.combinat import
*` because they are alomot all deprecated anyway and will be removed, even
if we have to wait for one year.
Nathann
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14138#comment:19>
Sage <http://www.sagemath.org>
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