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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: [mg66335] Re: [mg66318] mirror image of a square matrix
  • From: Sseziwa Mukasa <mukasa at jeol.com>
  • Date: Wed, 10 May 2006 06:33:23 -0400 (EDT)
  • References: <200605090635.CAA18543@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On May 9, 2006, at 2:35 AM, 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]]]

You can avoid the transposition with:

matR=Reverse/@mat

Alternatively you can do

matR=mat[[All,Range[Last[Dimensions[mat]],1,-1]]]

> Are there any built in functions for operations like these?

Not for this particular one, although there is the  
LinearAlgebra`MatrixManipulation package.

Regards,

Ssezi


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