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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124185] Re: take square of the second and third column of a table
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Thu, 12 Jan 2012 04:17:57 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201201112220.RAA22144@smc.vnet.net>

Note that Power is Listable

Attributes[Power]

{Listable, NumericFunction, OneIdentity, Protected}

{a, b, c}^{k, m, n}

{a^k, b^m, c^n}

dataA = RandomInteger[{1, 9}, {100, 3}]

dataB = #^{1, 2, 2} & /@ dataA


Bob Hanlon

On Wed, Jan 11, 2012 at 5:20 PM, hanciong awesome <hanciong at gmail.com> wrote:
> Hello, suppose I have a very long table like this:
>
> 1 2 3
> 4 5 6
> 7 8 9
> .......
> 2 3 4
>
> how can I take square of the 2nd and 3rd column? I always do it by
> making a new table. so let's say the above table is A and it has 100
> lines, then I make the new table as the following:
>
> B=Table[{A[[n]][[1]],A[[n]][[2]]^2,A[[n]][[3]]^2},{n,1,100}]
>
> But if the length of the table is unknown, this way is impractical.
> Could anyone suggests better way? thank you
>



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