This does look like a bug to me. It is likely that there was an error calling the gp script, and Sage then fails to parse the output. Can you file a trac ticket for this?
For more than a year there have been numerous attempts by me, Martin Raum an others to change the way Sage uses the Simon scripts, which have had various bug-fixes and improvements made to them *none* of which are in Sage since we failed to get it to work, despite Martin and I spending several complete days doing this at two Sage Days in March 2011 and December 2011. So there are known problems and a lot of work towards solutions. On thing that would help is to see if your example works using Simon's scripts directly (they are on his web page), not via Sage. I would do that but do not have time now. The point is to see if the newer version than Sage uses also gives rise to the problem. John On 26 May 2012 02:32, Alex C <thealexco...@gmail.com> wrote: > Hi Sage developers. I'm new to Sage, and I think I have found a bug, > but I may very well be doing something wrong. I'm on Ubuntu 11.04 > 64bit using Sage 5.0. Code which produces the problem is below. Thank > you for any help. > > > ---------------------------------------------------------------------- > | Sage Version 5.0, Release Date: 2012-05-14 | > | Type notebook() for the GUI, and license() for information. | > ---------------------------------------------------------------------- > sage: poly = CyclotomicField(43).subfields(3)[0][0].polynomial() > sage: poly > x^3 + x^2 - 14*x + 8 > sage: K = NumberField(poly, 'a') > sage: E = EllipticCurve(K, '37') > sage: E > Elliptic Curve defined by y^2 + y = x^3 + (-1)*x over Number Field in > a with defining polynomial x^3 + x^2 - 14*x + 8 > sage: E.simon_two_descent() > --------------------------------------------------------------------------- > TypeError Traceback (most recent call > last) > > /home/blatm/<ipython console> in <module>() > > /home/blatm/sage/sage-5.0-linux-64bit-ubuntu_10.04.3_lts-x86_64-Linux/ > local/lib/python2.7/site-packages/sage/schemes/elliptic_curves/ > ell_number_field.pyc in simon_two_descent(self, verbose, lim1, lim3, > limtriv, maxprob, limbigprime) > 281 verbose=verbose, lim1=lim1, > lim3=lim3, limtriv=limtriv, > 282 maxprob=maxprob, > limbigprime=limbigprime) > --> 283 prob_rank = Integer(t[0]) > 284 two_selmer_rank = Integer(t[1]) > 285 prob_gens = [self(P) for P in t[2]] > > /home/blatm/sage/sage-5.0-linux-64bit-ubuntu_10.04.3_lts-x86_64-Linux/ > local/lib/python2.7/site-packages/sage/rings/integer.so in > sage.rings.integer.Integer.__init__ (sage/rings/integer.c:6865)() > > TypeError: unable to convert x (=f) to an integer > > -- > To post to this group, send an email to sage-devel@googlegroups.com > To unsubscribe from this group, send an email to > sage-devel+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
