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Re: List Question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67949] Re: List Question
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Thu, 13 Jul 2006 06:54:59 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 7/12/06 at 5:05 AM, simonjbale at gmail.com (Simon Bale) wrote:

>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.

This is easily done with pattern matching as follows:

In[6]:=
data={{x1,y1},{x2,y2},{x3,y3,z3},{x4,y4}};

In[7]:=
data/.{a_,b_,_}->{a,b}

Out[7]=
{{x1, y1}, {x2, y2}, {x3, y3}, {x4, y4}}
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