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MathGroup Archive 2006

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Re: Sorting Rows of a Matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65122] Re: [mg65089] Sorting Rows of a Matrix
  • From: Gregory Lypny <gregory.lypny at videotron.ca>
  • Date: Wed, 15 Mar 2006 06:28:42 -0500 (EST)
  • References: <20060314130602.JZDI9108.eastrmmtao06.cox.net@[172.18.52.8]>
  • Sender: owner-wri-mathgroup at wolfram.com

Works like a charm.  Now what if that second column contained strings  
rather than numbers, for example, "Sydney", "Martha", "Alberta", and  
"Ralph"?

Regards,

	Greg

On Tue, Mar 14, 2006, at 8:05 AM, Bob Hanlon wrote:

> Sort[data, #1[[2]] < #2[[2]] &]
>
>
> Bob Hanlon
>
>>
>> From: Gregory Lypny <gregory.lypny at videotron.ca>
To: mathgroup at smc.vnet.net
>> Subject: [mg65122] [mg65089] Sorting Rows of a Matrix
>>
>> 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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