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MathGroup Archive 2004

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Re: extracting a list to a list, help please

  • To: mathgroup at smc.vnet.net
  • Subject: [mg46201] Re: extracting a list to a list, help please
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Tue, 10 Feb 2004 00:06:55 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 2/9/04 at 5:54 AM, nospam at nospam.com (Serge) wrote:

>I am a beginner in Mathematica and I have a rather simple question.
>I made some calculations that I need for an orbit and I have a list
>that look like this:

>mylist1 = {{a1,b1,c1,d1},{a2,b2,c2,d2},{a3,b3,c3,d3},etc}

>All I want to do is to make a list of the form

>mylist2 = {{a1,b1},{a2,b2},{a3,b3},etc}

>from the original list (mylist1),

>so that I can ListPlot those pairs of points (they represent x and
>y coordinates for some orbit).

ListPlot[mylist1[[All, {1,2}]]] will do what you want
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