Hello, I figured out the problem and posted a patch at http://trac.sagemath.org/sage_trac/ticket/2839 . It was a very silly mistake that I should have caught the last time; I've included doctests for the issue this time. I've also included a change which speeds up the change of basis for the classical symmetric functions over QQ:
Before: sage: time s(p(s([17,11]))) CPU times: user 1252.31 s, sys: 8.24 s, total: 1260.55 s Wall time: 1259.90 s[17, 11] sage: time a = s([10,10]).itensor(s([10,10])) CPU times: user 30.87 s, sys: 0.21 s, total: 31.09 s Wall time: 31.09 After: sage: time s(p(s([17,11]))) CPU times: user 257.11 s, sys: 0.03 s, total: 257.14 s Wall time: 257.15 s[17, 11] sage: time a = s([10,10]).itensor(s([10,10])) CPU times: user 3.60 s, sys: 0.00 s, total: 3.60 s Wall time: 3.60 --Mike On Sun, Apr 6, 2008 at 11:44 AM, mabshoff <[EMAIL PROTECTED]> wrote: > > On Apr 6, 8:32 pm, Nick Alexander <[EMAIL PROTECTED]> wrote: > > On 6-Apr-08, at 11:10 AM, Franco Saliola wrote: > > > > > > > > > > > > > Hello Mike (H), > > > > > > > On Sun, Apr 6, 2008 at 5:46 AM, Mike Hansen <[EMAIL PROTECTED]> wrote: > > > > >> I'm not able to reproduce your bug. Here is what I get: > > > > > I am able to reproduce the bug (on an Intel machine; see below). > > > > >> sage: s = SFASchur(QQ) > > >> sage: p = SFAPower(QQ) > > >> sage: s(p(s([14]))) > > >> s[14] > > >> sage: a = s(p(s([14])))*s([14]) > > >> sage: a > > >> s[14, 14] + s[15, 13] + s[16, 12] + s[17, 11] + s[18, 10] + s[19, > > >> 9] + > > >> s[20, 8] + s[21, 7] + s[22, 6] + s[23, 5] + s[24, 4] + s[25, 3] + > > >> s[26, 2] + s[27, 1] + s[28] > > > > > This is okay. > > > > >> sage: sage: s = SFASchur(QQ) > > >> sage: s([14,14]).itensor(s([17,11])) > > > > > This is not. For example, > > > > > sage: c = s([14,14]).itensor(s([17,11])) > > > sage: c.coefficients()[70] > > > 42204149/896259893760 > > > > I get the same (rational) result as Franco. I am running 'SAGE > > Version 2.11, Release Date: 2008-03-30' on > > > > $ uname -a > > Darwin pv109059.reshsg.uci.edu 8.11.1 Darwin Kernel Version 8.11.1: > > Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386 i386 > > i386 > > > > That's an Intel MacBook Pro, Core 2 duo, OS X 10.4.x. > > This seems to be a 32 vs. 64 bit issue. On sage.math: > > ---------------------------------------------------------------------- > | SAGE Version 3.0.alpha1, Release Date: 2008-04-04 | > | Type notebook() for the GUI, and license() for information. | > ---------------------------------------------------------------------- > > sage: s = SFASchur(QQ) > > sage: c = s([14,14]).itensor(s([17,11])) > sage: c.coefficients()[70] > 0 > sage: > Exiting SAGE (CPU time 18m6.83s, Wall time 25m14.11s). > > 18 minutes of CPU time translates to quite a long valgrind time, but > if it is an overflow that won't catch it anyway. > > > Nick > > Cheers, > > Michael > > > > > --~--~---------~--~----~------------~-------~--~----~ 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://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
