Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2011

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

Search the Archive

Re: Sorting nested lists with strings

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116296] Re: Sorting nested lists with strings
  • From: Peter Breitfeld <phbrf at t-online.de>
  • Date: Thu, 10 Feb 2011 05:22:01 -0500 (EST)
  • References: <iitejq$jib$1@smc.vnet.net>

Paperorbifold wrote:

> I've a nested list of this kind:
> list={{"Paul",23},{"Amanda",55},{"Carl",32},...}
> Suppose I want to perform an alphabetic sort on the first element. Which is 
> the condition I've to write in Sort[list,...]?
> Actually Sort[list] automatically operates on the second element.
> Thanks.
>  
> -- 
> ...and I will make them pay for\nwhat they've done! (J.L. Picard)
>

You may try

list = {{"Paul", 23}, {"Gustaf", 45}, {"Wilhelm", 13}, {"Arno", 45}};
list[[ Ordering[First/@list] ]]

Out={{"Arno", 45}, {"Gustaf", 45}, {"Paul", 23}, {"Wilhelm", 13}}

-- 
_________________________________________________________________
Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de


  • Prev by Date: Bug in ParallelDo?
  • Next by Date: Re: Sorting nested lists with strings
  • Previous by thread: Re: Sorting nested lists with strings
  • Next by thread: Re: Sorting nested lists with strings