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simple nest
*To*: mathgroup at smc.vnet.net
*Subject*: [mg106661] simple nest
*From*: Francisco Gutierrez <fgutiers2002 at yahoo.com>
*Date*: Wed, 20 Jan 2010 06:50:01 -0500 (EST)
Dear group:
I have a function that gets five arguments, two of which are fixed, and three vary. Its output are three numbers. So it can be nested, for example over some initial values.
Say:
Nest[func[arg1,arg2,#[[1]],#[[2]],#[[3]]]&,{init1,init2,init3},k]
Simple enough, works well.
Now I want to nest the same function, while the second non fixed argument changes at each step. I thought the "natural" way of doing this was:
NestWhile[func[arg1,arg2,#[[1]],#[[2]],#[[3]]]&,{init1,init2,init3},UnsameQ[#[[2]]&,2],
but this evidently does not work.
So: in a NestWhile how do I create tests over parts of the outputs of a function?
Thanks!
Fg
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