Re: "Alternating" function
- To: mathgroup at smc.vnet.net
- Subject: [mg63275] Re: [mg63260] "Alternating" function
- From: "David Park" <djmp at earthlink.net>
- Date: Thu, 22 Dec 2005 00:04:36 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Renan,
What about using Fold?
Fold[x + #2*f[#1] & , x, Table[(-1)^i, {i, 5}]]
x - f[x + f[x - f[x + f[x - f[x]]]]]
David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/
From: Renan [mailto:renan.birck at gmail.com]
To: mathgroup at smc.vnet.net
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.