[R] extract rows of a matrix

[Jonathan Christensen]

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
>
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