Re: Query from a gp newbie

[John Cremona <john.cremona@gmail.com>]

You can also access additional data from my original files which are
in the github repository https://github.com/JohnCremona/ecdata which
has associate website  http://johncremona.github.io/ecdata/

(or via the LMFDB at http://www.lmfdb.org/)

John

On 18 February 2016 at 07:10, Bill Allombert
<Bill.Allombert@math.u-bordeaux.fr> wrote:
> On Thu, Feb 18, 2016 at 01:45:08AM +0000, Timothy Murphy wrote:
>> What exactly is the relation between elldata and Cremona's tables?
>
> elldata contains all curves in Cremona's tables, but not all fields
> that are present in Cremona's tables.
>
>> If elldata does not contain all Cremona's tables,
>> what is the simplest way to access Cremona's data
>> given the name of a curve, eg "880a1", returned by ellidentify?
>
> Probably the simplest way is:
> E=ellinit("880a1");
>
> You can also do
> ? ellsearch("880a1")
> %29 = ["880a1",[0,0,0,2,3],[[3,6]]]
>
>> I am running gp on a Fedora-23 laptop, having installed it
>> from Fedora's pari-* packages.
>> I see that elldata was installed in /usr/share/pari/,
>> while you recommend placing your recent elldata
>> in /usr/local/share/pari.
>
> Linux distributions put files and binaries in the /usr/share and
> /usr/bin directory, while locally installed software are normally
> placed in /usr/local/share and /usr/local/bin
>
> Inside GP you can do
> ? default(datadir)
> %1 = "/usr/share/pari"
>
> to know where PARI is looking for extra data files.
>
> Cheers,
> Bill.
>