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Re: Sorting on multiple columns within a matrix

• To: mathgroup at smc.vnet.net
• Subject: [mg57859] Re: Sorting on multiple columns within a matrix
• From: "Mark Fisher" <mark at markfisher.net>
• Date: Fri, 10 Jun 2005 02:29:23 -0400 (EDT)
• References: <d892lm$sc6$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

How about this?

ColumnOrderSort[matrix_List, columns_List] :=
  Sort[matrix, OrderedQ[{#1[[columns]], #2[[columns]]}] &]

ColumnOrderSort[M, {2,1}]//MatrixForm

--Mark