Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2005
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2005

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

Search the Archive

Sorting on multiple columns within a matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57819] Sorting on multiple columns within a matrix
  • From: Lee Newman <leenewm at umich.edu>
  • Date: Thu, 9 Jun 2005 05:18:06 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,

I can't come up with a solution to the following simple task:

-  I have a matrix, let's M={ {"Z",2,"a"},{"A",2,"k"}, {"Z",1,"z"}, 
{"A",1,"a"},{"Z",3,"k"}, {"A",3,"z"} }
-  I want to be able to sort the matrix row-wise, based on multiple 
columns, for example sort first on column 2 (ascending) and then 
secondly on column1 (ascending)

desired result:
A 1 a
Z 1 z
A 2 k
Z 2 a
A 3 z
Z 3 k

I suspect the solution involves using a pure function of some form as 
the second argument in the Sort function, but I can't figure out what 
this function should be.

Thanks,
Lee


  • Prev by Date: Mathematica equivalent complexplot
  • Next by Date: Re: Using InterpolatingFunction in Argument of NIntegrate
  • Previous by thread: Re: Mathematica equivalent complexplot
  • Next by thread: Re: Sorting on multiple columns within a matrix