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MathGroup Archive 2006

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Re: mirror image of a square matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66328] Re: [mg66318] mirror image of a square matrix
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Wed, 10 May 2006 06:33:08 -0400 (EDT)
  • References: <200605090635.CAA18543@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On 9 May 2006, at 15:35, ravi wrote:

> Let me define the mirror image of a matrix as the operation of  
> flipping
> the columns such that the last column becomes the first, the second
> last becomes the second and so on. I would like to know if this can be
> done simpler than as follows:
>
> mat=Table[Random[],{n},{n}]
> matR=Transpose[Reverse[Transpose[mat]]]
> Are there any built in functions for operations like these?
> /ravi
>

Another possibility is:

matR=mat[[All, Range[n, 1, -1]]]

Andrzej Kozlowski
Tokyo,Japan


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