On 10/20/10 12:07 AM, Justin C. Walker wrote:
On Oct 17, 2010, at 17:50 , gagan wrote:
sage: E=EllipticCurve('11a1');
sage: E.modular_degree();
/Applications/sage/local/bin/sympow: line 3: 9922 Segmentation
fault ./sympow $*
I can't reproduce this problem (Mac OS X, 10.6.4, Dual Quad Xeon) using 4.4,
4.5.2, 4.5.3, or 4.6.a3.
Justin
--
Justin C. Walker, Curmudgeon at Large
Director
Institute for the Enhancement of the Director's income
Same here - I can't reproduce it (OpenSolaris on Xeon processor).
Based on an inspection of the source code for SYMPOW, it is the worst I've seen
in Sage. In fact, it's the worst code I have ever seen. So I personally would
not be surprised if there are bugs in it.
That said, both John and William use the code for computing the modular degree
of elliptic curves.
There is a trac ticket open for implementing the Watkins-Delaunay's algorithm
for computing modular degrees in Sage
http://trac.sagemath.org/sage_trac/ticket/9758
If there is a bug in the code, good luck finding it, as the code is almost
obfuscated.
Dave
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