WOLFRAM

Services & Resources / Wolfram Forums / MathGroup Archive

MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive

"Alternating" function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg63260] "Alternating" function
  • From: Renan <renan.birck at gmail.com>
  • Date: Tue, 20 Dec 2005 23:35:44 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com
Hello,

I want to make a "nested function" like: x + f[x - f[x + f[x - f[x + f[x]]]]].

I've tried using Nest but I don't find how to keep switching between
Plus and Minus: I would need something that would return an "index" so
I could keep track of when I need to "switch" the operation. (e.g. if
the "index" is odd, the operation is "Plus", otherwise is "Minus")

How can I make this? I looked in the help but didn't find any informations.

Thanks.




--
Thanks/obrigado, Renan "Wishmaster" Birck - Canoas, Rio Grande do Sul, Brasil
MSN: wizard_of_yendor at hotmail.com
Orkut: http://www.orkut.com/Profile.aspx?uid=2202360379963855296
  • Prev by Date: Convincing Mathematica that Sqrt[a+b]Sqrt[a-b]==Sqrt[a^2+b^2]
  • Next by Date: Re: Expression timing; a black art?
  • Previous by thread: Re: Convincing Mathematica that Sqrt[a+b]Sqrt[a-b]==Sqrt[a^2+b^2]
  • Next by thread: Re: "Alternating" function