r - Shuffle the columns of a matrix indepently using apply or plyr -

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I have a matrix in R, and randomly altering rows without the need to do any loop I want to, but for each column independently

Ie, 

  a = cbind (c (1,2,3), c (4,5,6))   < P> And I have to be a new matrix, say excitement, where columns 1c (1,2,3) and column 2c (4,5,6) randomly reshuffle.  
 For example,  
  asflu = cibind (c (1,3,2), c (6,4,5))   
 That is, in column 1, random shuffle changed the position of 2 and 3, and in column 2 a different random shuffle changed the position of 6 to 4, 4 to 5 and 5 to 6.  
 What would be a good way to do this without requiring a loop in the ROS?  
 Thank you!   
 
 
 How about it?  
  & gt; Apply (A, 2, sample)

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