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
On Mar 20, 5:52 pm, Nils Bruin nbr...@sfu.ca 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
On Sat, Mar 21, 2009 at 5:24 PM, Carl Witty carl.wi...@gmail.com wrote:
On Mar 20, 5:52 pm, Nils Bruin nbr...@sfu.ca 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
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, but I
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: DB =
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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