Re: take square of the second and third column of a table

*To*: mathgroup at smc.vnet.net*Subject*: [mg124188] Re: take square of the second and third column of a table*From*: "Nasser M. Abbasi" <nma at 12000.org>*Date*: Thu, 12 Jan 2012 04:18:59 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <jel20o$lkl$1@smc.vnet.net>*Reply-to*: nma at 12000.org

On 1/11/2012 4:21 PM, hanciong awesome wrote: > > how can I take square of the 2nd and 3rd column? I forgot to mention the simplest method, which is to square the slice of the matrix directly. tbl = {{1, 2, 3},{4, 5, 6},{7, 8, 9},{2, 3, 4}} for second col: tbl[[All, 2]]^2 -->{4, 25, 64, 9} to do both cols at same time: tbl[[All, {2, 3}]]^2 ---> {{4, 9}, {25, 36}, {64, 81}, {9, 16}} I like to Map allot, and so sometimes I overlook that it might not be needed. --Nasser