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Re: extracting a list to a list, help please


mylist1 = {{a1, b1, c1, d1}, 
    {a2, b2, c2, d2}, 
    {a3, b3, c3, d3}}; 
mylist1[[All,{1, 2}]]

{{a1, b1}, {a2, b2}, {a3, b3}}

Bobby

Serge <nospam at nospam.com> wrote in message news:<c07p1q$kk7$1 at smc.vnet.net>...
> 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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