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MathGroup Archive 2004

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Sorting question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52758] Sorting question
  • From: Nimrod <jdedguard-agent at yahoo.co.uk>
  • Date: Sat, 11 Dec 2004 05:23:38 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

 A simple sorting question that has me stumped as to how to do it both
quickly and elegantly.

I have a list of data pairs of the form (distance, time).  I want to
sort on the distance element and then remove all pairs where the time
element is out of order with the distance element.  For example
((1,1),(2,3),(3,2),(4,4)) --> ((1,1),(4,4)).  The actual lists are
much longer.

Thanks in advnace,

Nimrod.


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