Converting letters to numbers in entire dataframe

Question

I am having trouble applying the chartr() function on all columns of my data frame for converting letters to numbers.

I managed doing it on single colum

Answer 1

Using dplyr

library(dplyr)
DF %>% mutate_each(funs(chartr("ACGT", "1234", .)))

You get:

  ID POS1 POS2 POS3
1  1   13   34   33
2  2   32   22   24
3  3   44   42   14