On Sun, Oct 4, 2009 at 11:09 PM, rjf <fate...@gmail.com> wrote: > On Oct 4, 11:00 am, Ondrej Certik <ond...@certik.cz> wrote: > <snip..> > >> >> You (or anyone else) could have followed Fredrik's frequent and >> detailed blogposts here: >> >> http://planet.sympy.org/ > > I quote from a recent entry by Frederik: > > " > > The tests above use well-behaved object functions; some corner cases > are likely fragile at this point. I also know, without having tried, > that many other calculus functions utterly don't work in fixed > precision (not by algorithm, nor by implementation). Some work will be > needed to support them even partially. At minimum, several functions > will have to be changed to use an epsilon of 10-5 or so since full > 15-16-digit accuracy requires extra working precision which just isn't > available. > > " > > So it seems that we can expect the programs to get the easy problems > right, and the hard problems, maybe not.
Just for the record, that post is about something else entirely. I took some code written for variable-precision arithmetic and ran it using fixed-precision arithmetic. This works fine for some well-behaved problems and doesn't work at all for others; not exactly a surprise. I'm pointing out that, for use in fixed precision mode, some of the algorithms originally designed for variable precision will have to be modified or replaced. Fredrik --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
