I then get:
<repr(<sage.matroids.matroid.Matroid at 0x7f414ee8c940>) failed:
NotImplementedError: subclasses need to impleme
nt this.>
However, as I mentioned above, it makes more sense to use tutte_polynomial
from Graph in my situation (given that its bug has been fixed). So my
problem no longer really exists.
Thanks for the help!
On Thursday, May 14, 2015 at 1:29:36 PM UTC-7, Dima Pasechnik wrote:
>
>
>
> On Thursday, 14 May 2015 21:16:03 UTC+1, David Perkinson wrote:
>>
>> After putting
>>
>> import sage.matroids.matroid
>>
>
> how about
>
> from sage.matroids.matroid import 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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