On 11/06/2010 11:36 AM, Robert Ruser wrote: > 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? Keep in mind FAQ 7.31 when programming this...