On 04/09/2008, at 8:22 PM, agi wrote:
> > Hi, > I want to check if a number is set to infinity or NaN. So I tried this > if-statement: > > if x!=infinity: > print x > > But this doesn't work when x=a/b with a very small b, so that x > becomes infinity. > (I'm using SAGE Version 3.0.1) If x = 1.0/0 and y = -1.0/0, then (1) x.is_infinity() and y.is_infinity() are both True (2) x == y is False. (3) x.is_NaN() is False. Have a look at http://sagemath.org/doc/ref/module-sage.rings.real-double.html (search for "is_infinity") (There may be a better reference.) D --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
