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MathGroup Archive 1996

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Re: Lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4020] Re: [mg3881] Lists
  • From: Chee Lim Cheung/MS/SP_SF <CheeLC at sp.ac.sg>
  • Date: Mon, 20 May 1996 02:13:27 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Alex,

You can do the following:

Let    givenlist = { {1, 23}, {2, 24}, {3, 25}, {4, 26} }

To extract the second element in each sublist, you can use Map and Last like

Map[ Last,  givenlist ]

which will give you a vector containing the second elements of the sublists.

If you wish to regard each second element of the original list as a list, you 
can map List to the above result like

Map[ List,  Map[Last, givenlist] ]

This is effectively a column matrix.

I hope this helps.

 



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