On Wed, Mar 21, 2012 at 7:39 PM, kcrisman <kcris...@gmail.com> wrote: > > > On Mar 21, 10:00 pm, Gonzalo Tornaria <torna...@math.utexas.edu> > wrote: >> In sage 4.8: >> >> sage: NaN - NaN >> sage: 0 >> sage: NaN + NaN >> 2*NaN >> sage: NaN * NaN >> NaN^2 > > Naturally! Since NaN is a symbolic expression, apparently: > > sage: type(NaN) > <type 'sage.symbolic.expression.Expression'> > > See sage/symbolic/constants.py, e.g. > http://hg.sagemath.org/sage-main/file/c239be1054e0/sage/symbolic/constants.py#l665 > Based on the code in that file, I think that means this is the Pynac > NaN.
This is horrendous. Better to not have this "constant" (at least not in the global namespace) than behavior like this. The top level NaN, if we want one, could be in RR (precision doesn't really matter for this value). - Robert -- 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
