After putting
import sage.matroids.matroid
in sandpile.py and running sage -br, I get the following:
sage: f = Sandpile(graphs.CycleGraph(4),0)
sage: f.tutte_polynomial()
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-4-b3a9f7e45f84> in <module>()
----> 1 f.tutte_polynomial()
/projects/17e92ec6-3946-4bb0-b10a-44dc6297a1de/sage-6.7.beta4-x86_64-Linux/local/lib/python2.7/site-packages/sag
e/sandpiles/sandpile.pyc in tutte_polynomial(self)
1428 """
1429 if self.is_undirected():
-> 1430 return Matroid(Graph(self)).tutte_polynomial()
1431 else:
1432 raise UserWarning
("The underlying graph must be undirected.")
NameError: global name 'Matroid' is not defined
In the error message you can see the code for the new method I've added to
Sandpile.
On Thursday, May 14, 2015 at 12:22:32 PM UTC-7, Dima Pasechnik wrote:
>
>
>
> On Thursday, 14 May 2015 19:32:48 UTC+1, David Perkinson wrote:
>>
>> I am working on sandpile.py and would like to use tutte_polynomial from
>> sage/matroids/matroid.pyx. Could someone tell me the correct import
>> statement put in sandpile.py?
>>
>
> If you import sage.matroids.matroid you can create a matroid and call its
> member function tutt_polynomial? Or do you mean some other use?
>
> Dima
>
>
>
>> Thanks.
>>
>
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