#10581: change Large Cremona database format and extend it
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Reporter: gagansekhon | Owner: cremona
Type: enhancement | Status: new
Priority: minor | Milestone: sage-5.0
Component: elliptic curves | Keywords: cremona, stein, watkins,
elliptic curves, database
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by cremona):
Is there any point in including SW curves of conductor < 130000 which are
already in my database?
For conductor > 130000 I think it is a good idea to add the prefix sw.
I have scripts to create all of the files in the format at
http://www.warwick.ac.uk/staff/J.E.Cremona/ftp/data/
from a single file containing just one curve in each isogeny class, i.e.
from a file like
http://www.warwick.ac.uk/staff/J.E.Cremona/ftp/data/allcurves.00000-09999
but only containing the lines where field #3 ==1 (and called
curves.00000-09999).
So all that would be needed for the SW part of this would be to create
from the SW database such a file, but sorting the curves by conductor and
then (arbitrarily, or intelligently) sorting the isogeny classes.
Now if someone also re-writes the existing Sage scripts (in
sage/databases/cremona.py) to create mogodb files instead of the old style
db files, all that would be needed would be to run those after the ones I
have written. On the other hand, at this point there would be no point
(perhaps) in having all the intermediate plain text files at all:
instead, we could go directly from a single curves.* file to the complete
mongodb.
Small asides: 1. in the scripts I am writing I used Magma's HeegnerPoint
function to get generators for (some) rank 1 curves. 2. Despite what I
said above I have not yet written the (easy) scripts for the aplist,
degphi and intpts data files, since I have had other duties to perform...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10581#comment:7>
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