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Re: Lists


In article <4ms4eq$3n0 at dragonfly.wolfram.com>, Alex Bates
<albates at ursula.uoregon.edu> wrote:

>         I have a two dimensional list (i.e. {{1, 23}, {2, 24}, {3, 25}, 
> {4, 26}}), and I want to remove all the first values in each pair of 
> numbers.  For instance, for the first pair, I want it to read {23}, and 
> for the second, {24} instead of {2, 24}. 
>         Any help would be greatly appreciated.
> 
> -Alex Bates


One method is to use Transpose and Part:

In[1]:=
    mylist = {{1, 23}, {2, 24}, {3, 25}, {4, 26}}
Out[1]=
    {{1, 23}, {2, 24}, {3, 25}, {4, 26}}

In[2]:=
    mynewlist = Transpose[ mylist ][[2]]
Out[2]=
    {23, 24, 25, 26}

I hope this helps.

--Ian

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Ian Collier
Wolfram Research, Inc.
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tel:(217) 398-0700   fax:(217) 398-0747    ianc at wolfram.com
Wolfram Research Home Page:         http://www.wolfram.com/
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