Re: "Alternating" function
- To: mathgroup at smc.vnet.net
- Subject: [mg63267] Re: [mg63260] "Alternating" function
- From: ggroup at sarj.ca
- Date: Thu, 22 Dec 2005 00:04:29 -0500 (EST)
- References: <200512210435.XAA14743@smc.vnet.net>
- Reply-to: ggroup at sarj.ca
- Sender: owner-wri-mathgroup at wolfram.com
On Tuesday, December 20, 2005 at 23:35 GMT -0500, Renan wrote: > 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") You could define a dummy index variable at the beginning of your cell (eg. i=1;). Then in your function, simply add the factor ((-1)^i++). That way i is incremented every time the function is applied.
- References:
- "Alternating" function
- From: Renan <renan.birck@gmail.com>
- "Alternating" function