Re: Lists

*To*: mathgroup at smc.vnet.net*Subject*: [mg4023] Re: [mg3881] Lists*From*: "Paul R. Wellin" <wellin at telospub.com>*Date*: Mon, 20 May 1996 02:13:58 -0400*Sender*: owner-wri-mathgroup at wolfram.com

> 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. How about this for simplicity. Here is a set of pairs of integers: In[3]:= data = Table[Random[Integer,{1,10}],{5},{2}] Out[3]= {{10, 7}, {1, 8}, {3, 10}, {3, 7}, {1, 4}} And this replaces each pair with only the second entry: In[4]:= data /. {a_,b_} -> {b} Out[4]= {{7}, {8}, {10}, {7}, {4}} --- Paul Wellin Editor of Computational Science TELOS/Springer-Verlag 3600 Pruneridge Avenue, Suite 200 Santa Clara CA 95051 USA phone: 408-249-9314 fax: 408-249-2595 email: wellin at telospub.com WWW: http://www.telospub.com/~wellin/ ==== [MESSAGE SEPARATOR] ====