While running the code
for g in graphs():
print(g.is_line_graph())
Sage returns the error message, after lots of True-s and False-s:
---------------------------------------------------------------------------
Exception Traceback (most recent call last)
<ipython-input-6-a5cd36160d42> in <module>()
1 for g in graphs():
----> 2 print(g.is_line_graph())
3
/opt/sagemath-9.0/local/lib/python3.7/site-packages/sage/graphs/line_graph.pyx
in sage.graphs.line_graph.is_line_graph
(build/cythonized/sage/graphs/line_graph.c:2286)()
220 if g.is_connected():
221 try:
--> 222 R, isom = root_graph(g)
223 if certificate:
224 return True, R, isom
/opt/sagemath-9.0/local/lib/python3.7/site-packages/sage/graphs/line_graph.pyx
in sage.graphs.line_graph.root_graph
(build/cythonized/sage/graphs/line_graph.c:7147)()
621
622 if not is_isom:
--> 623 raise Exception(error_message)
624
625 return R, isom
Exception: It looks like there is a problem somewhere. Youfound a bug here
! Please report it on sage-devel,our google group !
What's the bug here?
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