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MathGroup Archive 2006

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RE: Sorting Rows of a Matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65123] RE: [mg65089] Sorting Rows of a Matrix
  • From: "David Park" <djmp at earthlink.net>
  • Date: Wed, 15 Mar 2006 06:28:45 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Greg,

mat = Table[{Random[Integer, {1, 10}], Random[Integer, {1, 10}]}, {10}]

Sort[mat, Last[#1] < Last[#2] &] // TableForm

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 

From: Gregory Lypny [mailto:gregory.lypny at videotron.ca]
To: mathgroup at smc.vnet.net


Hello everyone,

How can I sort the rows of a matrix by using one or more of the  
columns as sort keys just like in a spreadsheet?  For example, if  
matrix M is 12 x 2 with numbers in the first column and unordered  
month numbers in the second, how would I order the rows by month?

	Regards,

		Greg



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