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

One option is to use mixedorder() from the gtools package.

library(gtools)
a[mixedorder(a$c),]
#   a  b  c
# 1 1  1  1
# 2 2  2  2
# 7 7  4  3
# 3 3  3 10
# 4 4 10 11
# 5 5 12  X
# 6 6 21  Y