Working in Character mode :
> z<- c("Help","me","out")
> z
[1] "Help" "me" "out"
> z[3]
[1] "out"
> sort(z)
[1] "Help" "me" "out"
> z1<-c("d","a","e","r")
> order(z1)
[1] 2 1 3 4
> sort(z1)
[1] "a" "d" "e" "r"
> factor(z1)
[1] d a e r
> levels(z1)
NULL
> mode(z) #[modes are: numerical,complex,logical,character.Some consider
function as other mode]
[1] "character"
> rr<-character()
> rr
character(0)
> mode(rr)
[1] "character"
