On 10/14/07, Jonathan Bober <[EMAIL PROTECTED]> wrote: > > I'm not sure right now, but I'm thinking about it. > > You could try setting > > long_double_precision = double_precision > > wherever it is initialized. (This is around line 140 somewhere.) If you > do this it will just skip the part of the computation where it uses long > doubles (For some reason I have a feeling that there might be something > funny about the long double type on PPC OS X - but I don't know what > that reason is, so I could be wrong.)
Hi, It turns out that number_of_partitions with your algorithm is wrong for input 1000 on x86_64, but *right* on ppc... This threw me off for a while. I kept trying to lower precision on ppc with my test case being 1000 and of course it was always right on ppc but wrong on x86_64, so I thought the opposite. > > Similarly, you could play with setting qd_precision = dd_precision to > skip the part of the computation with quad_doubles, or set everything to > double_precision, so that it only uses either mpfr or standard doubles, > etc. > > Another thing to try is using just a little bit more precision. See > around line 572, in the function compute_extra_precision(). You could > turn the 5 into, say, a 15 or a 30 to see what happens. If that works, > then you can try to experiment to see what the smallest number that > works is. > > On Sun, 2007-10-14 at 14:40 -0600, William Stein wrote: > > Hi Jon, > > > > Your number_of_partitions code is in the current sage-2.8.7.rc1, > > and it works on all but one machine we tested in on. Unfortunately > > -- JUST AS YOU SUSPECTED -- it doens't work on PPC OS X. It runs, > > but gives wrong answers. Any ideas how to fix your code to still > > work on OS X PPC, even slowly? > > > > William > > > > > > > > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ 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/ -~----------~----~----~----~------~----~------~--~---
