Re: mirror image of a square matrix

*To*: mathgroup at smc.vnet.net*Subject*: [mg66347] Re: mirror image of a square matrix*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Wed, 10 May 2006 06:34:08 -0400 (EDT)*Organization*: The Open University, Milton Keynes, UK*References*: <e3pean$ief$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

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 > Hi Ravi, You can *Map* [1] the *Reverse* function onto the matrix. For example In[1]:= m = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; In[2]:= Reverse /@ m Out[2]= {{3, 2, 1}, {6, 5, 4}, {9, 8, 7}} Best regards, Jean-Marc [1] http://documents.wolfram.com/mathematica/functions/Map