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MathGroup Archive 2004

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Re: Part of a matrix or array

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51351] Re: [mg51334] Part of a matrix or array
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Fri, 15 Oct 2004 02:45:45 -0400 (EDT)
  • References: <200410141037.GAA14972@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On 14 Oct 2004, at 19:37, Gregory Lypny wrote:

>
> Hello everyone,
>
> Mathematica has so many functions for accessing parts of arrays that
> I'm not sure which one I should be using to get a submatrix, for
> example, rows 3 to 7 and columns 11 to 14 of matrix X.  Should I use
> Take?
>
> 	Take[X,{3,7},{11,14}]
>
> Is there a more compact way where I don't have to explicit refer to a
> function?
>
> 	Regards,
>
> 		Greg
>

Well, yes and no ....

X[[Range[3, 7], Range[11, 14]]]

you can write that also as

X[[{3,4,5,6,7},{11,12,13,14}]] so now you do not "refer to a function" 
but this can hardly be called "more compact".



Andrzej Kozlowski
Chiba, Japan
http://www.akikoz.net/~andrzej/
http://www.mimuw.edu.pl/~akoz/


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