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/
- References:
- Part of a matrix or array
- From: Gregory Lypny <gregory.lypny@videotron.ca>
- Part of a matrix or array