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MathGroup Archive 2000

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RE: Sort List of Lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24824] RE: [mg24809] Sort List of Lists
  • From: "David Park" <djmp at earthlink.net>
  • Date: Sun, 13 Aug 2000 23:49:47 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

testlist = {{9, 2}, {1, 6}, {2, 4}};

Sort[testlist, #1[[2]] > #2[[2]] & ]
{{1, 6}, {2, 4}, {9, 2}}

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/

> -----Original Message-----
> From: dana2 [mailto:dan_news at hotmail.com]
To: mathgroup at smc.vnet.net
>
> Hello.  Could someone please give me a clue on how to sort a list based on
> the Second Element in a List:
> I think one needs to use a "pure function" but I am too new with
> Mathematica (v4)
> (Trying to learn though) :>)
>
> For Example, I would like to sort this list based on the second element in
> each sub-list in "Descending" order:
>
> {{9, 2}, {1, 6}, {2, 4}}
>
> Results would be:
> { {1,6},{2,4},{9,2} }
>
>
> I think I will learn a lot about Lists, Sorting, and Pure Functions all in
> one shot  if I could get a hint on how to do this.
> Thank you  very much.  Dana
>
>
>
>
>
>



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