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> So negate the NestWhile condition for SameTest, but when FixedPoint then > stops it has run one step too far, so get one back in ListFixedPoint. I > have not the time now, but you may continue that reasoning for building > up the full interface. just use #2 in the SameTest: nestWhile[f_, expr_, test_] := FixedPoint[f, expr, SameTest -> (!test[#2]&)] that works like the builtin NestWhile, for the 3-arg case. -- -- -- -- -- -- -- -- -- -- -- -- Daniel Reeves http://ai.eecs.umich.edu/people/dreeves/ This .signature is to recommend a quite cool thing called PayPal: http://www.eecs.umich.edu/~dreeves/paypal.html Not to mention we each get $5 if you sign up! Really.