#15291: The Matroid() function should support rings that don't implement
is_field()
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Reporter: Stefan | Owner:
Type: enhancement | Status: new
Priority: minor | Milestone: sage-6.2
Component: matroid theory | Resolution:
Keywords: matroid | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by Rajesh_Veeranki):
I'm not sure what should be written inside the except block.How do we
construct a matroid from a ring which is not a field, and which function
to use.Please clarify,seeing the code i've pasted!
----
{{{
#!python
if 'matrix' in kwds:
if base_ring == GF(2):
M = BinaryMatroid(groundset=kwds['groundset'], matrix=A)
elif base_ring == GF(3):
M = TernaryMatroid(groundset=kwds['groundset'], matrix=A)
else:
try:
if base_ring.is_field():
try:
if base_ring.order() == 4: # GF(4) can have
different generators.
M =
QuaternaryMatroid(groundset=kwds['groundset'], matrix=A)
else:
M =
LinearMatroid(groundset=kwds['groundset'], matrix=A, ring=base_ring)
except NotImplementedError:
raise NotImplementedError
except NotImplementedError:
raise NotImplementedError
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/15291#comment:2>
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