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Union question

• To: mathgroup at smc.vnet.net
• Subject: [mg13889] Union question
• From: Garrett Andrew Storaska <gas2y at node4.unix.virginia.edu>
• Date: Sun, 6 Sep 1998 02:55:27 -0400
• Organization: University of Virginia
• Sender: owner-wri-mathgroup at wolfram.com

I'm trying to take a very long list of real numbers and use the Union
function on it to remove duplicates.  The problem is that the real
numbers that I consider to be the same, differ after their 12th decimal
place.  I have tried without sucess to use N and SetAccuracy functions
on each element of the list Before using the Union Function, but to no
Avail.  Is there any quick way to take a long list, and remove
duplicate elements by comparing only the first n significant digets of
each element.


Thanks,


Garrett Storaska