#14068: nauty_geng is naughty
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Reporter: azi | Owner: jason, ncohen, rlm
Type: defect | Status: new
Priority: major | Milestone: sage-5.7
Component: graph theory | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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I think nauty_geng should not ignore geng's return value and return an
exception if the returned value is not 0. Consider the following:
{{{
def find_counterexample(n):
for G in graphs.nauty_geng("-c" + str(n)):
if is_counterexample(G):
print 'Yeees, there is a counterexample'
return
print 'No counterexamples! Conjecture holds'
}}}
the code appears to be just fine but it has a bug! Namely it tries to run
the program geng with the parameter "-cn" instead of "-c n". Hence geng
returns an error and instead of getting an error in Sage, it simply does
not generate any graphs.
There are plenty of ways one could shot himself in the foot in this way
and not know it. Hence I propose this gets fixed somehow!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14068>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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