[R] Finding all rows of a matrix equal to vector
Sebastian Lerch
lerch at lavabit.com
Sat Jul 16 11:29:02 CEST 2011
Hi everyone,
my question might be very trivial, but I could not come up with an answer...
I want to find out how often a matrix contains a certain vector as row:
x1<-c(1,2,3)
x2<-c(1,5,6)
x3<-c(7,8,9)
A<-matrix(c(rep(x1,5),rep(x2,5),rep(x3,5),rep(x1,5)),nrow=20,ncol=3,byrow=T)
How can I find out, how many times x1 is a row of A?
Thanks in advance and best regards,
Sebastian
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