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MathGroup Archive 2006

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Re: Rescale

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65443] Re: Rescale
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Sat, 1 Apr 2006 05:39:05 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 3/31/06 at 6:09 AM, koopman at sfu.ca (Ray Koopman) wrote:

>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?

I would *guess* it is doing exactly as advertised using floating point arithmetic and what you are seeing for some inputs is due to the usual vagaries of floating point arithmetic.
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