|Bill Allombert on Tue, 08 Sep 2015 19:06:58 +0200|
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|Re: SEA without seadata|
On Mon, Sep 07, 2015 at 03:28:50PM +0200, Bill Allombert wrote: > Dear PARI developers, > > I have pushed a patch to master which allow ellap/ellcard to use the > function polmodular written by Hamish instead of (or in addition to) > the seadata database for the SEA algorithm. > > This means that you can now: > > 1) use SEA without installing seadata (but this is will be at least three time > slower) > > 2) use SEA for fields that are so large they exhaust seadata. An example: ? p=nextprime(2^1200);E=ellinit([1,5],p);ellap(E) %5 = -6406302751743670778436449985059273221847339658151681884226689558480131779196962880021436806438460746120382135677025301722355718942715320150690927385821748846184438904805661975226027 (this involves the computation of modular polynomials in gamma_2 up to degree 719, which using the parallel version is done relatively quickly on multiple cores) Cheers, Bill.