Dropping Similar Numbers from List

*To*: mathgroup at smc.vnet.net*Subject*: [mg60564] Dropping Similar Numbers from List*From*: "andre" <erasmus.the.giant at gmail.com>*Date*: Tue, 20 Sep 2005 05:19:43 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

My data set has some numbers which differ by a small amount, say one part in 10^-15, that I don't want to appear more than once. If they were identical, I would just use Union[data] and be finished. Is there a way to set a tollerance for the Union function? I tried to use SetPrecision to get rid of the unwanted extra digits, but Union[SetPrecision[data,n]] gives the same result as Union[data]. What exactly does SetPrecision do? It seems that it's not just dropping the digits beyond the limit I set. Andre