I have the 2 datasets below:
stud<-c("MARK","DGHN","BHKJ")
mark<-c(4,6,7)
d1<-data.frame(stud,mark)
stud2<-c("MARK","DGHN","BHKJ","dfgd","fg")
mark2<-""
d2<-data.frame(stud2,mark2)
I want to pass to the mark2 of d2 the values of mark of d1 for the students that exist in both stud and stud2. The rest of the names of the stud2 should remain as they are but their respective mark2 values should be NAs.I tried:
d2$stud2 <- factor(d2$stud2, levels=levels(d1$stud))
d2$mark2 <- ifelse(d2$stud2 == d1$stud, d1$mark, NA)
but not all of the stud2 values appear. Is there another way without having to mess with the fact that they do not have the same count of factors?
