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MathGroup Archive 2006

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Re: Rescale

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65437] Re: Rescale
  • From: Peter Pein <petsie at dordos.net>
  • Date: Sat, 1 Apr 2006 05:38:55 -0500 (EST)
  • References: <e0j3hj$fti$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Ray Koopman schrieb:
> InputForm@{#,Rescale@#}&@Sort@Table[Random[],{3}]
> 
> {{0.1495146427525807, 0.9032356867418898, 0.9803938132050517},
>  {2.7755575615628914*^-17, 0.9071367664432557, 1.0000000000000002}}
> 
> What is Rescale doing, that it does not always give N@0 and N@1
> for the first and last elements?
> 
These are the usual roundoffs.

Do[v=Rescale@Sort@Table[Random[Real,{0,1},$MachinePrecision],{3}];
   If[v[[{1,3}]]=!={0.,1.},Return[{i,v}]],{i,10^6}]

didn't report a single triple with other values as 0. and 1. at the beginning/end.


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