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MathGroup Archive 2002

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Re: NestWhile

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32542] Re: NestWhile
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Sat, 26 Jan 2002 04:08:03 -0500 (EST)
  • References: <a2r3ih$9m8$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Tom,

NestWhileList[f,7,(#!=1&)]

{7,22,11,34,17,52,26,13,40,20,10,5,16,8,4,2,1}

--
Allan

---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565


"Tom De Vries" <tdevries at shop.westworld.ca> wrote in message
news:a2r3ih$9m8$1 at smc.vnet.net...
> Hello!
>
> I know this is a simple question, hope someone can help me out.....
>
> If I define the function
>
> f[n_] := If[EvenQ[n], n/2, 3n + 1]
>
>
> I can then apply NestList and generate a nice number loop......
>
> NestList[f, 7, 23]
>
> I want to use NestWhileList and stop when the generated number is a 1.
How
> do I do that?
>
> Thanks for the help,
>
> Sincerely,
>
> Tom De Vries
>
>




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