[R] repeating rows or columns within a matrix

Dr. Diego Kuonen kuonen at statoo.com
Thu Mar 21 11:48:20 CET 2002

Juhana Vartiainen wrote:
> Spse I have a matrix, say
> and I would like to expand it by repeating rows within the matrix, to
> get, if the repeating factor is 2, say:
> (or columnwise as well) . There must be a smart way of doing that?

For your particular example the following works

  apply(matrix(1:9,ncol=3,byrow=T), 2, rep, rep(2,3))

You may also want to look at 


to adapt it to your needs.


  Diego Kuonen

Dr. ès sc. Diego Kuonen        CEO & Applied Statistician 
Statoo Consulting, PO Box 107, 1015 Lausanne, Switzerland
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