Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

Re: Bug in 5.1??

• To: mathgroup at smc.vnet.net
• Subject: [mg54469] Re: Bug in 5.1??
• From: "Dana DeLouis" <delouis at bellsouth.net>
• Date: Mon, 21 Feb 2005 03:44:38 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Seems to me that the loss of precision returns an "Interval", which is still
greater than zero.  It looks like the cutoff between True & False is a hair
above -1, which doesn't make sense to me either.

Interval[N[5, 2]]
Interval[{4.9, 5.1}]

N[5, 2] > -1
True

N[5, 2] > -1 + $MachineEpsilon
False

-- 
Dana DeLouis
Mathematica 5.1
Win XP

"Gehrmann, James E" <jgehrman at saclink.csus.edu> wrote in message
news:cv6qvv$68d$1 at smc.vnet.net...
> I'm running Mathematica v. 5.1 under WinXP and had the following
interaction with Mathematica:
> 
> 5>0
> 
> True
> 
> 5.>0
> 
> True
> 
> N[5]>0
> 
> True
> 
> N[5,3]>0
> 
> True
> 
> N[5,2]>0
> 
> False
> 
> N[50000,2]>0
> 
> False
> 
> Are the last two results a bug or am I not understanding the N function?
> 
> Thanks for you help.
>

• Follow-Ups:
  • Re: Re: Bug in 5.1??
    • From: DrBob <drbob@bigfoot.com>