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Sorting a matrix [message #83346]

Fri, 01 March 2013 04:45

Mats Löfdahl
Messages: 263
Registered: January 2012

Senior Member

I'd like to sort a matrix M in such a way that the order of the rows is determined by the value in the first column. When the first column values are the same, the second column should be used, etc.

Something like Craig Marqwardt's multisort (http://cow.physics.wisc.edu/~craigm/idl/down/multisort.pro), with M[0,*] used as key1, M[1,*] as key2, etc. But without actually having to specify the keys one by one. (Never mind which index counts as the column index :o)

As the matrices I have in mind right now are integer arrays and do not have that many possible values (just -1,0,1), I thought about turning the matrix into a 1D string array with the length of each string equal to the number of columns and translating the column values into characters in the string, like A for -1, B for 0, C for 1, and then sorting the string array. But I'd prefer a more general program, in case there is one out there.

Pointers, ideas?

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[Message index]

		Sorting a matrix By: Mats Löfdahl on Fri, 01 March 2013 04:45
		Re: Sorting a matrix By: Mats Löfdahl on Fri, 01 March 2013 08:49
		Re: Sorting a matrix By: Jeremy Bailin on Tue, 05 March 2013 21:22
		Re: Sorting a matrix By: Jeremy Bailin on Fri, 01 March 2013 08:28
		Re: Sorting a matrix By: Mats Löfdahl on Thu, 07 March 2013 05:32
		Re: Sorting a matrix By: Jeremy Bailin on Thu, 07 March 2013 16:34
		Re: Sorting a matrix By: Mats Löfdahl on Fri, 08 March 2013 16:14
		Re: Sorting a matrix By: cgguido on Fri, 08 March 2013 16:24
		Re: Sorting a matrix By: cgguido on Fri, 08 March 2013 14:24
		Re: Sorting a matrix By: Jeremy Bailin on Fri, 08 March 2013 15:51
		Re: Sorting a matrix By: Mats Löfdahl on Fri, 08 March 2013 16:31

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