# Re: Possreps and numeric types

From: Bob Badour <bbadour_at_pei.sympatico.ca>

Date: Thu, 29 Mar 2007 06:57:56 GMT

Message-ID: <UrJOh.16810$PV3.173483_at_ursa-nb00s0.nbnet.nb.ca>

>>Gene Wirchenko wrote:

>

> The definition of epsilon.

Date: Thu, 29 Mar 2007 06:57:56 GMT

Message-ID: <UrJOh.16810$PV3.173483_at_ursa-nb00s0.nbnet.nb.ca>

> Bob Badour <bbadour_at_pei.sympatico.ca> wrote: >

>>Gene Wirchenko wrote:

*>>**>>>Bob Badour <bbadour_at_pei.sympatico.ca> wrote:**>>>**>>>[snip]**>>>**>>>>I admit I used epsilon somewhat sloppily and not necessarily with the**>>>>exact meaning used when discussing a particular floating-point**>>>>implementation. I used it to mean the distance to the representable**>>>>predecessor or successor of any representable rational value.**>>>**>>> That is incorrect. It is per**>>> http://en.wikipedia.org/wiki/Machine_epsilon**>>>In a floating-point system, epsilon is the smallest number such that**>>> 1 + epsilon > 1**>>>**>>>[snip]**>>**>>When you say the above is incorrect, are you saying I was not using**>>epsilon sloppily? Or are you saying I didn't use it to mean the distance**>>to the representable predecessor or successor of any representable**>>rational value?*>

> The definition of epsilon.

Other than the "scaled by the exponent" bit, what exactly is the difference? ie. If I subtracted one from the other, what answer would I get? Received on Thu Mar 29 2007 - 08:57:56 CEST