#11292: Allow broader inputs to lattice meet and join
-----------------------------+----------------------------------------------
Reporter: rbeezer | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-4.7.1
Component: combinatorics | Keywords: beginner
Work_issues: | Upstream: N/A
Reviewer: | Author: Rob Beezer
Merged: | Dependencies:
-----------------------------+----------------------------------------------
Changes (by newvalueoldvalue):
* cc: saliola (added)
* keywords: => beginner
* status: new => needs_review
* author: => Rob Beezer
Old description:
> The meet and join methods of a lattice should be more robust about their
> inputs, like the is_lequal method is.
>
> {{{
> sage: P = Posets.IntegerCompositions(4)
> sage: L = LatticePoset(P)
> sage: L.list()
> [[4], [3, 1], [2, 2], [2, 1, 1], [1, 3], [1, 2, 1], [1, 1, 2], [1, 1, 1,
> 1]]
> sage: L.meet([3,1], [1,2,1])
> ---------------------------------------------------------------------------
> AttributeError Traceback (most recent call
> last)
> <snip>
> AttributeError: 'list' object has no attribute 'vertex'
> sage: L.is_lequal([3,1], [1,2,1])
> True
> }}}
New description:
The meet and join methods of a lattice should be more robust about their
inputs, like the is_lequal method is.
{{{
sage: P = Posets.IntegerCompositions(4)
sage: L = LatticePoset(P)
sage: L.list()
[[4], [3, 1], [2, 2], [2, 1, 1], [1, 3], [1, 2, 1], [1, 1, 2], [1, 1, 1,
1]]
sage: L.meet([3,1], [1,2,1])
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
<snip>
AttributeError: 'list' object has no attribute 'vertex'
sage: L.is_lequal([3,1], [1,2,1])
True
}}}
'''Apply:'''
1. [attachment:trac_11292-inputs-lattice-meet-join.patch]
--
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11292#comment:1>
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