Karim Belabas on Tue, 22 Jan 2008 00:22:08 +0100 |
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Re: Why ellheight() only for minimal model? |
* Jeroen Demeyer [2008-01-11 21:32]: > I thought that I discovered a "bug" in ellheight(), but then I read the > documentation which states that E must be a standard minimal integral > model. Would it not be possible instead to make ellheight() work for any > elliptic curve over Q? Sure, but this would be inefficient. Why waste 1ms recomputing a minimal integral model in each height computation ? ( essentially, factor( gcd(c4,c6) ) + elllocalred for each prime divisor found ) > In any case, I think the short help ?ellheight > should also specify this condition. Agreed. Done in svn. K.B. -- Karim Belabas Tel: (+33) (0)5 40 00 26 17 Universite Bordeaux 1 Fax: (+33) (0)5 40 00 69 50 351, cours de la Liberation http://www.math.u-bordeaux.fr/~belabas/ F-33405 Talence (France) http://pari.math.u-bordeaux.fr/ [PARI/GP] `