#16892: Function to check if a poset containt a subposet isomorphic to another
poset
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-wishlist
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/function_to_check_if_a_poset_containt_a_subposet_isomorphic_to_another_poset|
f13f2385d2b79adad5dae8282162d776bb8114bd
Dependencies: | Stopgaps:
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Comment (by ncohen):
Yoooooooooooooo !
> But if I do `self.transitive_closure()` instead of
`DiGraph(self).transitive_closure()` I get
>
> {{{
> NotImplementedError: An immutable graph does not change name
> }}}
That's a bug. There is no reason why computing the transitive closure of a
graph requires that graph to be mutable (indeed, the graph itself is not
modified: its closure is returned as a completely new graph).
You can fix it by going into {{{src/graph/generic_graph.py}}}, and in
function `transitive_closure` replace `copy(self)` with
`self.copy(immutable=False)`.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16892#comment:7>
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