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.