Hello Bill,
sage: E = EllipticCurve('5077a'); E
Elliptic Curve defined by y^2 + y = x^3 - 7*x + 6 over Rational Field
sage: E?
Type: EllipticCurve_rational_field
Base Class: <class
'sage.schemes.elliptic_curves.ell_rational_field.EllipticCurve_rational_field'>
String Form: Elliptic Curve defined by y^2 + y = x^3 - 7*x + 6 over
Rational Field
Namespace: Interactive
Docstring:
Elliptic curve over the Rational Field.
If you look at the base class, you can see what class your object
belongs to. The Python code for that class is in
$SAGE_ROOT/devel/sage-main/sage/schemes/elliptic_curves/ell_rational_field.py
. Another way to have found this is
sage: E.point_search?
Type: instancemethod
Base Class: <type 'instancemethod'>
String Form: <bound method
EllipticCurve_rational_field.point_search of Elliptic Curve defined by
y^2 + y = x^3 - 7*x + 6 over Rational Field>
Namespace: Interactive
File:
/opt/sage/local/lib/python2.5/site-packages/sage/schemes/elliptic_curves/ell_rational_field.py
Definition: E.point_search(self, height_limit, verbose=True)
Finally, there is the search_src function that can be used to search
from within Sage.
sage: search_src('def point_search')
schemes/elliptic_curves/ell_rational_field.py: def
point_search(self, height_limit, verbose=True):
If you want to play around with changing that code, I would make a new
branch by using "sage -clone ell". Then, you can make changes to the
files in $SAGE_ROOT/devel/sage-ell/ . To test them out, you can do
"sage -br ell" which will build them and run the 'ell' branch. This
makes things easier when it comes time to upgrade since no changes
will have been made to the sage-main repository. It also allows you
to isolate changes for submitting patches. I will probably make a
blog post here shortly on my workflow for doing Sage development.
--Mike
On Dec 23, 2007 12:18 PM, bill purvis <[EMAIL PROTECTED]> wrote:
>
> I'm new to Sage and haven't found my way around yet.
> I've downloaded 2.9 source and compiled it.
> For those who collect statistics it reported taking 4H 17M on my
> Toshiba Equium (Intel Celeron, 2.9GHz).
>
> I'm interested in adapting John Cremona's code for finding rational
> points on elliptic curves to handle integer points and have located
> the source code for this in cremona????.spkg. However, this is all
> C++ code and I need to locate the Python code that invokes this
> so as to extend or supplement the calling sequence. Can anyone tell
> me where to look for this? Where is the EllipticCurve stuff defined?
> The particular function is <EllipticCurve>.point_search.
>
> Many thanks,
>
> Bill
> --
> +---------------------------------------+
> | Bill Purvis, Amateur Mathematician |
> | email: [EMAIL PROTECTED] |
> | http://bil.members.beeb.net |
> +---------------------------------------+
>
> >
>
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