Something to discuss and work on at Sage Days 6, perhaps, since David and Bill and William (and I) will be there?
John On 9/15/07, David Harvey <[EMAIL PROTECTED]> wrote: > > > On Sep 15, 2007, at 3:30 AM, William Stein wrote: > > > > > On 9/14/07, Bill Hart <[EMAIL PROTECTED]> wrote: > >> In actual fact, it should be possible for us to write efficient > >> conversion routines in C for going from a FLINT polynomial object to > >> an NTL polynomial object and vice versa (at the very least), so a > >> partial transition to NTL is both possible and definitely > >> advisable if > >> SAGE is to safely transition to FLINT. > > > > In my opinion you make doing the above your absolutely top priority > > before everything else. I'm not sure, but I suspect it won't be > > terribly difficult for you -- in fact, it will probably be easy -- > > but it > > would probably be very difficult for me. If you create such > > conversion functions, then as you mention below it will be possible > > to base ZZ[x] implementation in SAGE on FLINT very soon, and > > just resort to NTL for all the other operations, then as you implement > > new functionality we just replace 2 or 3 lines of Cython with your > > new faster function, and the rest of SAGE remains unchanged. > > I agree with William S, this is the most important thing to do. > > But maybe consider doing it the other way around: continue to use NTL > as the base implementation in SAGE for a while, and make SAGE convert > objects to FLINT objects temporarily for arithmetic, if the objects > are large enough to make it worthwhile. > > My main concern is that using fmpz_poly will kill the machine for > certain kinds of sparse polynomials. For example if you create the > polynomial x^1000000 + 2^1000000, then NTL is perfectly fine with > that, but fmpz_poly will try to allocate a million coefficients with > a million bits each. Boom. > > david > > > > > -- John Cremona --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
