extract rows of a matrix
Hannah, a <- matrix(rnorm(10000),nrow=500) new.matrix <- a[seq(0,dim(a)[1],by=20),] Jonathan
On Tue, Oct 12, 2010 at 1:59 PM, li li <hannah.hlx at gmail.com> wrote:
Hi all, ?I want to extract every 20th row of a big matrix, say 10000 by 1000. What is the simper way to do this? ? Thank you very much! ? ? ? ? ? ?Hannah ? ? ? ?[[alternative HTML version deleted]]
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