On Monday, 28 January 2013 19:05:31 UTC+8, Snark wrote: > > Le 28/01/2013 11:55, Dima Pasechnik a �crit : > > On 2013-01-28, Julien Puydt<julien...@laposte.net <javascript:>> > wrote: > >> Hi, > >> > >> here is where we stand: > >> > >> - build: ok, even though libm4rie's conversion.c is a pain ; > >> > >> - ptestlong: three failing tests, related to libc's gamma function (as > >> usual... I should find the time to fix that...) ; > >> > >> - bdist: available in the bdist/ directory of my home dir (~jpuydt) on > >> sage.math.washington.edu > >> > >> > >> Snark on #sagemath > >> > >> PS: in case someone has access to another ARM box than ubuntu-based, > >> here is which files give problems ; please report if you don't see > errors : > >> sage -t --long -force_lib devel/sage/sage/functions/other.py > >> sage -t --long -force_lib devel/sage/sage/symbolic/expression.pyx > >> sage -t --long -force_lib devel/sage/sage/rings/arith.py > > > > I wonder why exactly these files also produce numerical noise on Cygwin, > > as I reported: > > > http://boxen.math.washington.edu/home/dima/tmp/cygwin_sage-5.7.beta0.test.log > > E.g. > > File > > "/usr/local/src/sage/sage-5.7.beta0/devel/sage/sage/rings/arith.py", > > line 3162: > > sage: binomial(0.5r, 5) > > Expected: > > 0.02734375 > > Got: > > 0.02734375000000001 > > > > How one does get numerical noise like this on an Intel, is beyond me. > > Eh, I was hoping someone would tell me "I have an ARM and I don't see > the problem" so I could have a look at the libc used and see if that > helped fixing the issue. > > And here you come, with another place where similar problems arise. And > I notice that the value you "Got:" is the same I see on ARM :-P >
This is a eglibc/glibc problem, we reported on https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/713985 What I cannot recall is why this problem does not show up on (32-bit) Linux x86. Note that the code in question (on bug/713985) gives almost the same output as on ARM on such a platform, too. But somehow Sage manages to work around this. Dima > Snark on #sagemath > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
