Re: Re: odd mathematica blindspot

*To*: mathgroup at smc.vnet.net*Subject*: [mg56548] Re: [mg56502] Re: odd mathematica blindspot*From*: Edward Peschko <esp5 at pge.com>*Date*: Thu, 28 Apr 2005 02:40:51 -0400 (EDT)*References*: <d4klbs$eg7$1@smc.vnet.net> <200504270153.VAA01785@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

From: Edward Peschko <esp5 at pge.com> To: mathgroup at smc.vnet.net Bcc: Subject: [mg56548] Re: [mg56502] Re: odd mathematica blindspot Reply-To: On Tue, Apr 26, 2005 at 09:53:49PM -0400, Skirmantas wrote: > Hi Ed, > > By definition, 9999999999999/10000000000000 is an exact rational number, whereas 0.5 is an approximate real number: Well, that's completely unintuitive.. I understand it, but it still rubs me the wrong way for some reason. '.5' on paper means that to me - .5 - not .4999999999 or .50000000001 or whatever internal representation the computer chooses.. In fact, that's why I got Mathematica in the first place, to get away from this approximate stuff. Why couldn't mathematica treat .5 as a string, make the internal calculation and turn .5 into 5/10? Or, barring that, is there a conversion function for this (going back and forth between rational and approximate real? Ed

**Follow-Ups**:**Re: Re: Re: odd mathematica blindspot***From:*Daniel Lichtblau <danl@wolfram.com>

**References**:**Re: odd mathematica blindspot***From:*Skirmantas <skirmantas.janusonis@yale.edu>