On Mar 11, 2009, at 10:23 PM, Carl Witty wrote: > On Wed, Mar 11, 2009 at 9:35 PM, Robert Bradshaw > <rober...@math.washington.edu> wrote: >>> Here's some examples to hopefully clarify: >> >> >>> RealField(20) -> RealField(50) >>> RealField(20) -> RealIntervalField(20) >> >> I would call these dangerous,
I should clarify, it'd be dangerous to use these for arithmetic. >> as the latter implicitly has more >> "information" than the former. > > No they don't: > > sage: pi20.exact_rational() > 411775/131072 > sage: RealField(50)(pi20).exact_rational() > 411775/131072 > > See, exactly the same information :) I get your point, but to me if a function returns 1.00000000000000000000000000 that's more "information" than if a function returns 1.000, and 1.00000000? is more information yet. - Robert --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
