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MathGroup Archive 1996

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Re: How do I use Select[list,condition]?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4547] Re: How do I use Select[list,condition]?
  • From: Wolfram at 3rd.Eye.net
  • Date: Wed, 7 Aug 1996 04:17:53 -0400
  • Organization: 3rd Eye
  • Sender: owner-wri-mathgroup at wolfram.com

In article <4thatm$j6e at dragonfly.wolfram.com>, welter at texoma.com (Jason
Welter) wrote:

> I have a list that looks like:
> 
> data = {{1,1,a,4,5,6},{2,1,a,2,3,4},{3,1,a,7,8,9},
>                {1,2,b,4,5,6},{2,2,b,2,3,4},{3,2,b,7,8,9},
>                {1,3,c,4,5,6},{2,3,c,2,3,4},{3,3,c,7,8,9}}
> 
> and I want to pick out the lists that have a 2 as the second element
> of the list.  I tried something like:
> 
> data1 = Select[data,data[[#,2]]==2];
> 
> but this doesn't work.  How do I do it?

Like this:

      Select[data, #[[2]]==2&]

the "&" makes it a `pure' function

Wjr

-- 
}.
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        I only exist in interaction

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