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MathGroup Archive 2011

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Re: FixedPoint[Cos, 1.0]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg119390] Re: FixedPoint[Cos, 1.0]
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Wed, 1 Jun 2011 06:54:28 -0400 (EDT)

I can confirm this happens on Mac OS X, with versions 6, 7 and 8. and even 
5.2. Strange that nobody has noticed this for such a long time.

Andrzej Kozlowski


On 31 May 2011, at 13:49, J Siehler wrote:

> My numerical analysis students this past term pointed out to me that
> the command
>
> FixedPoint[Cos, 1.0]
>
> which is the first example in the Information for FixedPoint doesn't
> ever finish running (or, not in any reasonable amount of time).  We
> tried this on serveral versions of Mathematica (6.x, 7.x, and 8.x),
> all on OS X, and got the same nonresult.
>
> It can be forced by specifying something like FixedPoint[Cos, 1.0,
> SameTest -> (Abs[#1 - #2] < 10^-10 &)] or FixedPoint[Cos, 1.0, 40],
> but it seems like that should be unnecessary, and the form given in
> the documentation should work.  Can anybody else confirm this
> behavior?  Am I missing something totally obvious here?
>


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