[R] Vectorization in a random order

[Thomas Chesney]

Is there a way to use vectorization where the elements are evaluated in a random order?

For instance, if the code is to be run on each row in a matrix of length nBuy the following will do the job

for (b in sample(1:nBuy,nBuy, replace=FALSE)){

}

but

apply(nBuyMat, 1, function(x))

will be run I believe, in the same order each time (Row1, then Row2, then Row3 etc.)

This is important for building agent based models (the classic explanation of this is probably Huberman & Glance's response to Nowak & May's 1992 Nature article - Evolutionary games and computer simulations, http://www.pnas.org/content/90/16/7716.abstract)

Thank you,

Thomas
http://www.nottingham.ac.uk/~liztc/Personal/index.html



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