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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: [mg46177] Re: [mg46155] extracting a list to a list, help please
  • From: "Mihajlo Vanevic" <mvanevic at gawab.com>
  • Date: Tue, 10 Feb 2004 00:05:44 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

In[1]:=
mylist1 = {{a1, b1, c1, d1}, {a2, b2, c2, d2}, {a3, b3, c3, d3}}

Out[1]=
{{a1, b1, c1, d1}, {a2, b2, c2, d2}, {a3, b3, c3, d3}}

In[2]:=
mylist1[[All, {1, 2}]]

Out[2]=
{{a1, b1}, {a2, b2}, {a3, b3}}

Regards,				 
         Mihajlo Vanevic

**************************************************************
*    At 2004-02-09, 05:54:00 
*        Serge, nospam at nospam.com  wrote:
**************************************************************
>Hello,
>
>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.
>
>Best,
>Serge
**************************************************************




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