How to order my dataframe lexicographicaly

Question

I have a following data frame

a = data.frame(a=c(1,2,3,4,5,6,7),b=c(1,2,3,10,12,21,4),c=c(1,2,10,11,\"X\",\"Y\",3))
> a
  a  b  c
1 1  1  1
2 2  2  2
3 3         


        

Answer 1

Sticking in base you could make a function yourself:

a = data.frame(a=c(1,2,3,4,5,6,7),b=c(1,2,3,10,12,21,4),c=c(1,2,10,11,"X","Y",3))

SORTER_DEVICE <- function(x) {
    c(sort(as.numeric(na.omit(gsub("[a-zA-Z]", NA, x)))),
        sort(na.omit(gsub("[0-9]", NA, x))))
}
data.frame(apply(a, 2, SORTER_DEVICE))