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"Alternating" function


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
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