Re: SortBy
- To: mathgroup at smc.vnet.net
- Subject: [mg118214] Re: SortBy
- From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
- Date: Sat, 16 Apr 2011 07:37:22 -0400 (EDT)
- References: <io8to0$qbf$1@smc.vnet.net>
Easy indeed:
SortBy[{{300, 48, 2}, {500, 23, 5}, {120, 55, 7}, {40, 32,
1}}, #[[2]] &]
Cheers -- Sjoerd
On Apr 15, 9:56 am, graser <gra... at gmail.com> 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!