On Fri, Aug 15, 2008 at 1:57 AM, Håkan Granath
<[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> Is this a bug or am I doing something stupid? I get different
> precisions the first and second time I run the same command.
>
> ----------------------------------------------------------------------
> | SAGE Version 3.0.6, Release Date: 2008-07-30 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
>
> sage: E = EllipticCurve('37a')
> sage: E.period_lattice().basis(prec=30)
>
> (2.993458646231959629832009979452508177797583791370132985340523378563250356987,
>
> 2.451389381986790060854224831866525225349617289144796614656471406129152899999*I)
> sage: E.period_lattice().basis(prec=30)
>
> (2.9934586462319596298320099794525081777975837913701329853405233785632503569866829041203940673970514734358405271049472881941443872373720252543753766710932613753043332505965246252164473069072694510749057806365610445781725817135182427934263132488980086942438020870431669315,
>
> 2.4513893819867900608542248318665252253496172891447966146564714061291528999992568928911321280291810887126842188696618479754751998666167558016789381647830306324546902881738259304962523119593946698932473794558796569481958707269691493740581897037588157844669302474334546641*I)
>
>
> Best regards,
>
> Håkan
This is definitely a bug. The output precision should be as given by
the prec option. The bug is caused by a mistake in the caching code,
surely. This will likely be easy to fix. This is now
trac #3954:
http://trac.sagemath.org/sage_trac/ticket/3954
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