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I am new to sage and I am trying to run the gp interface.

In gp I can define an elliptic curve e and then access j by e.j

? e=ellinit([0,-1,1,0,0]);
? e.j
%2 = -4096/11

Trying to do the same in sage I did

e=gp.ellinit([0,-1,1,0,0])

What is the syntax to return j for this e. e.j does not work nor do variations like gp.e.j that I tried -- I know that j is stored in 

e[13]

but I would like to use the syntax (or something close to) e.j, or e.disc, etc that I am used to typing when working directly in gp.

I am probably missing something very simple here. Thank you for any help.

sopsku
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  • Does this answer your question? http://www.sagemath.org/doc/constructions/elliptic_curves.html – Amzoti Dec 06 '12 at 21:43
  • No - I want to access the j that is a member of e i.e e.j -- I don't want to calculate an new E in sage access member E.j_invariant(). – sopsku Dec 07 '12 at 00:29
  • @Amzoti I should added that it is not really j that I am interested in. That was just a reproducible example. I want to learn how to use the gp interface in sage to access the member x (i.e. X.x) for an object X in gp. – sopsku Dec 07 '12 at 00:34

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