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