> Looking deeper, I think the problem might be with
> S.NegativeInfinity._sage_:
>
> In [48]: source((-oo)._sage_)
> In file: ./sympy/core/numbers.py
> def _sage_(self):
> import sage.all as sage
> #XXX: fixme, this should work:
> #return sage.Integer(self[0])/sage.Integer(self[1])
> return sage.Integer(self.p)/sage.Integer(self.q)
>
> But oo._sage_ (assumedly) does the right thing:
>
> In [49]: source(oo._sage_)
> In file: ./sympy/core/numbers.py
> def _sage_(self):
> import sage.all as sage
> return sage.oo
>
> I'm not sure why the former does not just return -sage.oo. Anyway, I
> bet if you patch the SymPy code to do that, it will work (let us know
> if it does, so we can fix it here too).
>
I think I found it:
class Infinity(RationalConstant):
__metaclass__ = Singleton
defines
def _sage_(self):
import sage.all as sage
return sage.oo
But:
class NegativeInfinity(RationalConstant):
__metaclass__ = Singleton
doesn't have an equivalent statement for _sage_ so I guess this bit is used:
p = -1
q = 0
I'll add a sage bit in there and see if it fixes the problem.
Francois
This email may be confidential and subject to legal privilege, it may
not reflect the views of the University of Canterbury, and it is not
guaranteed to be virus free. If you are not an intended recipient,
please notify the sender immediately and erase all copies of the message
and any attachments.
Please refer to http://www.canterbury.ac.nz/emaildisclaimer for more
information.
--
You received this message because you are subscribed to the Google Groups
"sympy" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sympy?hl=en.
