detecting repeated values in a vector

[Caitlin Burgess <caitlin@cbr.washington.edu>]

Hello,

I'm trying to detect repeated values of length k in a vector of
measurements (a stuck sensor). I was thinking of something like

 
for (val in 1:(length(vector)-k+1)) {
 
    if ( vector[val:(val+k)] == rep(vector[val],k) ) {#detection positive}
 
}
 
It's a long vector and there are many of them though... Is there a better
way?
 
Thanks for help,
 
Caitlin