#16151: Making BasisExchangeMatroid fool-proof with user input sanity checks
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Reporter: Jayant | Owner: Jayant Apte
Type: defect | Status: new
Priority: minor | Milestone: sage-6.2
Component: matroid | Keywords:
theory | Authors: Jayant Apte
Merged in: | Report Upstream: Reported upstream. Developers
Reviewers: | acknowledge bug.
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Following creates a segfault:
{{{
from sage.matroids.advanced import *
M = BasisMatroid(matroids.named_matroids.Vamos())
len(M.independent_r_sets(9))
}}}
This is because of wrong user input (vamos matroid has only 8 elements, so
there is no independent set of size bigger than 8). This ticket is to add
sanity checks on user input to filter out such cases and raise appropriate
exceptions.
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Ticket URL: <http://trac.sagemath.org/ticket/16151>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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