[R] compare and replace

[Ben Bolker]

Robert Ruser <robert.ruser <at> gmail.com> writes:

> 
> Hello R Users,
> I'm wondering if there exists any elegant and simple way to do the
> following: I have a data.frame X fills in numbers. I have a vector y with
> numbers as well. Every value in X that is equal to any values in y should
> be replaced by e.g. 1. Any idea?
> 
> Robert
> 

  If the data frames are completely filled with numbers you
should be able to operate on them as matrices (?as.matrix,
?as.data.frame).

X <- matrix(1:16,nrow=4)
Y <- matrix(rep(2:5,4),nrow=4)

(X[X %in% c(Y)] <- 1)