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MathGroup Archive 2003

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Re: diffrence between ver 3.01 and 4.1 regarding N[]?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39213] Re: diffrence between ver 3.01 and 4.1 regarding N[]?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 4 Feb 2003 02:21:17 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <b1ideh$bjh$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

try FullForm to see all digits of a floating point number
that is truncated by the Print/Output functions.

Regards
  Jens

peter weijnitz wrote:
> 
> I tried some of my Mathematica3.01 programs on a computer with
> Mathematica4.1,
>  there where some differences that I could not explain.
> 
>  Regarding N[]: consider for example:
> with version 4.1 I got:
> 
> N[Sqrt[2.],16]->1.4142
> and
> N[Sqrt[2.],17]->1.4142135623730950
> 
> and in version 3.01:
> 
> N[Sqrt[2.],16]->1.414213562373095
> and
> N[Sqrt[2.],17]->1.4142135623730950
> 
> Using SetPrecision[Sqrt[2.],16] I could make Mathematica4.1 give me 16
> digits precision.
> Ideas?
> 
> Peter W


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