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Re: List Question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67938] Re: [mg67889] List Question
  • From: "Carl K. Woll" <carl at woll2woll.com>
  • Date: Thu, 13 Jul 2006 06:54:03 -0400 (EDT)
  • References: <200607120905.FAA22137@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Simon Bale wrote:
> Hi,
> 
> I have a list with the following structure:
> 
> {{x1,y1},{x2,y2},{x3,y3,z3},{x4,y4}...}
> 
> As you can see some of the data points have three elements. I would
> like to remove these z elements so that the list has a structure
> {{x1,y1},{x2,y2},{x3,y3},{x4,y4}...}. I'm not sure how to achieve this
> so any
> help is greatly appreciated.
> 
> Regards, Simon Bale.

Here are two reasonbly simple methods:

data = {{x1,y1},{x2,y2},{x3,y3,z3},{x4,y4}};

Take[data, All, 2]

or

data[[All,{1,2}]]

will both yields your desired result.

Carl Woll
Wolfram Research


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