#5280: problem with a subposet coming from an order_filter
---------------------------+------------------------------------------------
Reporter: jhpalmieri | Owner: somebody
Type: defect | Status: new
Priority: minor | Milestone: sage-combinat
Component: combinatorics | Keywords:
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With sage-3.3.rc0:
{{{
sage: B = BooleanLattice(3)
sage: 4 in B
True
sage: B.principal_order_filter(4) # all elements >= 4
[4, 5, 6, 7]
sage: B.subposet(B.principal_order_filter(4))
Finite poset containing 4 elements
sage: show(B.subposet(B.principal_order_filter(4)))
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call
last)
...
NotImplementedError: BUG: sort algorithm for elements of 'Finite lattice
containing 8 elements' not implemented
}}}
I get the same problem with 'order_filter' instead of
'principal_order_filter', and also for 'order_ideal' (e.g.,
{{{show(B.subposet(B.order_ideal([2, 4])))}}} produces a similar message).
Note, though, that {{{show(B.subposet(B.principal_order_ideal(4)))}}}
works just fine.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5280>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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