[R] Finding all rows of a matrix equal to vector

[Denis Kazakiewicz]

Hi
a bit ugly approach
but it works

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)
A
B <- apply(A,1, FUN = function(x)paste(x, collapse = ''))
table(B)



On 16.07.2011 12:29, Sebastian Lerch wrote:
> 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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