#9816: Elliptic Curves over RR or CC have wrong type
-------------------------------+--------------------------------------------
Reporter: cremona | Owner: cremona
Type: defect | Status: new
Priority: minor | Milestone: sage-4.6
Component: elliptic curves | Keywords:
Author: John Cremona | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
-------------------------------+--------------------------------------------
As of 4.5.3.alpha2, elliptic curves defined over RR or CC without giving
the base explicitly are given type {{{EllipticCurve_generic}}} instead of
{{{EllipticCurve_field}}}, which means that some functions which should be
available for them are not:
For example, over RR:
{{{
sage: E = EllipticCurve([1.2,3.4])
sage: type(E)
<class 'sage.schemes.elliptic_curves.ell_generic.EllipticCurve_generic'>
sage: E.weierstrass_p()
...
AttributeError: 'EllipticCurve_generic' object has no attribute
'weierstrass_p'
sage: E = EllipticCurve(RR,[1.2,3.4])
sage: type(E)
<class 'sage.schemes.elliptic_curves.ell_field.EllipticCurve_field'>
sage: E.weierstrass_p()
1.00000000000000*z^-2 + 0.000000000000000*z^-1 + 0.000000000000000 +
0.000000000000000*z - 0.240000000000000*z^2 + 0.000000000000000*z^3 -
0.485714285714286*z^4 + 0.000000000000000*z^5 + 0.0192000000000000*z^6 +
0.000000000000000*z^7 + 0.0317922077922077*z^8 + 0.000000000000000*z^9 +
0.0174386436420723*z^10 + 0.000000000000000*z^11 -
0.00169558441558439*z^12 + 0.000000000000000*z^13 -
0.00137243886869437*z^14 + 0.000000000000000*z^15 -
0.000392255141636108*z^16 + 0.000000000000000*z^17 +
0.0000813530244020272*z^18 + O(z^20)
}}}
and similarly over CC.
This is easy to fix, and I'll post a patch shortly.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9816>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
