Groups > comp.soft-sys.math.mathematica > #1689

SortBy

From	graser <graser@gmail.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	SortBy
Date	2011-04-15 07:56 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<io8to0$qbf$1@smc.vnet.net> (permalink)

Show all headers | View raw

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!

Back to comp.soft-sys.math.mathematica | Previous | Next — Next in thread | Find similar | Unroll thread

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

csiph-web