Grokbase Groups R r-help March 2002
FAQ

On Thu, Mar 21, 2002 at 12:19:37PM +0200, Juhana Vartiainen wrote:
Hello

Spse I have a matrix, say

1 2 3
4 5 6
7 8 9

and I would like to expand it by repeating rows within the matrix, to
get, if the repeating factor is 2, say:

123
123
456
456
789
789

(or columnwise as well) . There must be a smart way of doing that?

Many thanks

Juhana Vartiainen
juhana.vartiainen at labour.fi


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I do not know if it is a smart way, but that's a way:

m <- matrix(1:9, 3, 3, byrow=T)
rep.fact <- 2 # repeating factor, say 2
mm <- matrix(rep(m, rep(rep.fact, length(m))), nrow(m)*rep.fact, ncol(m))


Hopin' it helps,



Laurent





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Laurent Gautier CBS, Building 208, DTU
PhD. Student D-2800 Lyngby,Denmark
tel: +45 45 25 24 85 http://www.cbs.dtu.dk/laurent
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