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Re: Exiting a Nested operation...

• To: mathgroup at smc.vnet.net
• Subject: [mg127991] Re: Exiting a Nested operation...
• From: Daniel <dosadchy at its.jnj.com>
• Date: Fri, 7 Sep 2012 04:58:50 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• Delivered-to: l-mathgroup@wolfram.com
• Delivered-to: mathgroup-newout@smc.vnet.net
• Delivered-to: mathgroup-newsend@smc.vnet.net

To exit Nest when some condition is met you can Throw an exception, like this:

result=NestWhile[
(your code ...
..
If[finalConditionIsMet, Throw[someResult]];
..
.. you code end),
initial,
True&]//Catch;

This NextWhile is supposed to run indefinitely (because of the 'True&' as test function), but will exit when 'finalConditionIsMet' is True.

For debug you should probably use something like this:

result=Nest[
(your code ...
..
If[finalConditionIsMet, Throw[someResult]];
..
.. you code end),
initial,
50]//Catch;

so the NestWhile will not run indefinitely if you have a bug.