Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1996
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1996

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg3994] Re: Lists
  • From: ianc (Ian Collier)
  • Date: Tue, 14 May 1996 02:13:30 -0400
  • Organization: Wolfram Research, Inc.
  • Sender: owner-wri-mathgroup at wolfram.com

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

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

==== [MESSAGE SEPARATOR] ====


  • Prev by Date: movies
  • Next by Date: Re: Context Names Question (2)
  • Previous by thread: Lists
  • Next by thread: Re: Lists