#16395: adjacency_matrix raises error for large multigraphs
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Reporter: lipshitz | Type: defect
Status: new | Priority: minor
Milestone: sage-6.3 | Component: graph theory
Resolution: | Report Upstream: N/A
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For G a graph, G.adjacency_matrix() calls G.density() to decide whether
to use a dense or sparse matrix. G.density() raises a TypeError if G is a
multigraph. This is silly.
To witness the problem, try:
sage: G = Graph([(i,i+1) for i in range(500)]+[(0,1),], multiedges=True)
sage: G.adjacency_matrix()
The revised code tries density and, if that raises a TypeError, defaults
to a dense matrix. (So, if someone extends density, this code
automatically improves.)
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Ticket URL: <http://trac.sagemath.org/ticket/16395>
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