Victor,
The code at trac #3416 implements all this properly in Sage. It's an
ancient ticket but the work on it is new, and it is one of the ones where
so many people have wprked on it that there's no-onle left to revview it.
That is a pity since Volker did a very nice job on it. But if you are able
to download and apply the patch there then that's an alternative.
John
On 24 April 2013 13:39, Volker Braun <vbraun.n...@gmail.com> wrote:
> I'm pretty sure I removed that in #3416
>
>
> On Wednesday, April 24, 2013 1:27:58 PM UTC+1, Victor Miller wrote:
>>
>> E = EllipticCurve_from_cubic(F,(0,**0,1))
>>>
>>>
>>> Traceback (most recent call last):
>>> File "<stdin>", line 1, in <module>
>>> File "_sage_input_8.py", line 10, in <module>
>>> exec compile(u'open("___code___.py"**,"w").write("# -*- coding: utf-8
>>> -*-\\n" +
>>> _support_.preparse_worksheet_**cell(base64.b64decode("**RSA9IEVsbGlwdGljQ3VydmVfZnJvbV**9jdWJpYyhGLCgwLDAsMSkp"),**globals())+"\\n");
>>> execfile(os.path.abspath("___**code___.py"))
>>> File "", line 1, in <module>
>>>
>>> File
>>> "/private/var/folders/zs/**sfhqf6rs4dgdjf89wmqsc6440000gn**/T/tmpy6Qdo7/___code___.py",
>>> line 3, in <module>
>>> exec compile(u'E = EllipticCurve_from_cubic(F,(_**sage_const_0
>>> ,_sage_const_0 ,_sage_const_1 ))
>>> File "", line 1, in <module>
>>>
>>> File
>>> "/Applications/Sage-5.8-OSX-**64bit-10.8.app/Contents/**Resources/sage/local/lib/**python2.7/site-packages/sage/**schemes/elliptic_curves/**constructor.py",
>>> line 575, in EllipticCurve_from_cubic
>>> s = magma.eval(cmd)
>>> File
>>> "/Applications/Sage-5.8-OSX-**64bit-10.8.app/Contents/**Resources/sage/local/lib/**python2.7/site-packages/sage/**interfaces/magma.py",
>>> line 539, in eval
>>> raise RuntimeError, "Error evaluating Magma code.\nIN:%s\nOUT:%s"%(x,
>>> ans)
>>> RuntimeError: Error evaluating Magma code.
>>> IN:aInvariants(MinimalModel(**EllipticCurve(Curve(Scheme(P, x^3 + 2*x*y^2 +
>>> 2*x*y*z + y^2*z + 2*x*z^2 + y*z^2)),P!(0, 0, 1))));
>>> OUT:
>>> In file
>>> "/Users/victorsmiller/.sage/**temp/Victors_MacBook_Pro_2.**local/7371/interface/tmp7444",
>>> line 1, column 110:
>>> >> x^3 + 2*x*y^2 + 2*x*y*z + y^2*z + 2*x*z^2 + y*z^2)),P!(0, 0, 1))));
>>> ^
>>> Runtime error in elt< ... >: No permutation group context in which to
>>> create cycle
>>>
>>>
>>>
>>>
>>> --
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