#12136: FVS function in DiGraph returns [0] instead of [] if already directed
acyclic
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Reporter: fichtejo | Owner: tbd
Type: defect | Status: new
Priority: trivial | Milestone: sage-4.8
Component: PLEASE CHANGE | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by fichtejo):
Well the problem is the function does
{{{
1573: if self.is_directed_acyclic(): # this checks if it is a
# directed acyclic graph
1574: if value_only:
return 0 # if value only, we return 0.
# It's totally fine, since the size
of
# the feedback vertex set is 0.
from sage.sets.set import Set
return Set([0]) # This seems strange to me. Since it
# should return the empty set. But it
# returns the set with exactly one
# vertex {0}. Correct me if I'm
wrong.''''''
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12136#comment:2>
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