Groups > comp.soft-sys.math.mathematica > #1736

Re: SortBy

From	Helen Read <readhpr@gmail.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: SortBy
Date	2011-04-16 11:32 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<iobuo9$b8e$1@smc.vnet.net> (permalink)
References	<io8to0$qbf$1@smc.vnet.net>

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On 4/15/2011 3:56 AM, graser wrote:
> Dear Mathematica group,
>
> I have a simple question for you.
>
> Let's say there is a list like
>
> KS = {{300, 48, 2}, {500, 23, 5}, {120, 55, 7}, {40, 32, 1}};
>
> I want to sort it by second element.
>
> I can use
>
> Sort[KS, #2[[2]]>  #1[[2]]&]
>
> It gives out like
>
> {{500, 23, 5}, {40, 32, 1}, {300, 48, 2}, {120, 55, 7}}
>
> But if I want to use SortBy, how to do that?
>
> SortBy[KS, ??]
>
> Thanks!
>
>

SortBy[KS, #[[2]] &]

-- 
Helen Read
University of Vermont

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Thread

SortBy graser <graser@gmail.com> - 2011-04-15 07:56 +0000
  Re: SortBy Peter Pein <petsie@dordos.net> - 2011-04-16 11:34 +0000
  Re: SortBy Albert Retey <awnl@gmx-topmail.de> - 2011-04-16 11:38 +0000
  Re: SortBy Peter Breitfeld <phbrf@t-online.de> - 2011-04-16 11:38 +0000
  Re: SortBy "Sjoerd C. de Vries" <sjoerd.c.devries@gmail.com> - 2011-04-16 11:39 +0000
  Re: SortBy Helen Read <readhpr@gmail.com> - 2011-04-16 11:32 +0000

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