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MathGroup Archive 2001

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Re: A question on machine numbers

  • To: mathgroup at smc.vnet.net
  • Subject: [mg29900] Re: A question on machine numbers
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 18 Jul 2001 02:08:44 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <9j0hji$fjq$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

In[]:={$MachineEpsilon, $MinMachineNumber, $MaxMachineNumber}

Out[]={2.220446049250313*^-16, 2.2250738585072014*^-308, 
 1.7976931348623157*^308}

A Cray computer (if there would be an Mathematica for it)
would return other vaules.

Regards
  Jens

"Ersek, Ted R" wrote:
> 
> Which if any platforms running Mathematica
> version 3 or 4 return something different for
> the following input.
> -----------
> 
> In[1]:=
>   {N[2^-52] === $MachineEpsilon,
>    N[2^-1022] === $MinMachineNumber,
>    N[2^1024] === $MaxMachineNumber}
> 
> Out[1]=
>   {True, True, True}
> 
> -------------
> I understand this is the
> case for double precision on any computer which
> uses IEEE 754 floating point arithmetic.
> 
> Thanks,
> Ted Ersek


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