Perhaps the Sage version of the database should have the rounded
analytic Sha values and not the floating point ones (for positive rank
curves, I mean: in the rank 0 case the values are already integers).
Nils, if you get the files
http://www.warwick.ac.uk/staff/J.E.Cremona/ftp/data/allbigsha.*.
> Note that you're skipping the last conductor in the database, I
> think... DB.conductor_range? indicates that the returned values
> represent an inclusive range, but range/xrange/etc. take their second
> argument as an exclusive bound. (This is easy to fix with the above
> xrange expression, bu
On Sat, Mar 21, 2009 at 5:24 PM, Carl Witty wrote:
>
> On Mar 20, 5:52 pm, Nils Bruin wrote:
>> sage: DB = CremonaDatabase()
>> sage: L = [ N.str()+c[0] for N in (lambda l: xrange(l[0],l[1]))
>> (DB.conductor_range()) for c in DB.allbsd(N).items() if
>> round(RDF(c[1][4]))%81 ==
On Mar 20, 5:52 pm, Nils Bruin wrote:
> sage: DB = CremonaDatabase()
> sage: L = [ N.str()+c[0] for N in (lambda l: xrange(l[0],l[1]))
> (DB.conductor_range()) for c in DB.allbsd(N).items() if
> round(RDF(c[1][4]))%81 == 0]
...
> - the whole lambda expression to make the pair ou
On Fri, Mar 20, 2009 at 10:20 PM, N. Bruin wrote:
>
> Thanks Craig,
>
> The '*arg' notation is exactly what I was looking for. My confidence
> in Guido and the sage API designers is restored.
There is also a **kwds's notation, which you should learn about.
If you have a function foo that takes
Thanks Craig,
The '*arg' notation is exactly what I was looking for. My confidence
in Guido and the sage API designers is restored.
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Hi Nils,
Yep, I think there are ways of making this nicer.
> I was interested in elliptic curves with possible 9-torsion in Sha, so
> I figured querying Cremona's database would get me some examples.
> After some experimenting, I finally created a query that had the
> desired result:
>
> sage: D
