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MathGroup Archive 2004

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extracting a list to a list, help please

  • To: mathgroup at
  • Subject: [mg46155] extracting a list to a list, help please
  • From: Serge <nospam at>
  • Date: Mon, 9 Feb 2004 05:54:04 -0500 (EST)
  • Sender: owner-wri-mathgroup at


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). I am having trouble figuring out how to do 
this. I tried using the Table command but I couldn't get it into the 
above form. I would greatly appreciate if someone can help me out. 
Thanks so much.


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