[R] Swap rows and columns in a matrix

[David Winsemius]

On Oct 30, 2012, at 11:59 AM, Haris Rhrlp wrote:

> Dear R users,
> 
> I want a help to write an algorithm for swapping rows and columns in a matrix
> 

This will "shuffle" columns, although 'randomly permute' is the more common word for this;operation:

set.seed(123)
mat[, sample(dim(mat)[2] ]

This will swap rows:

set.seed(123)
mat[ sample(dim(mat)[1],  ]

-- 
David Winsemius, MD
Alameda, CA, USA