Label Encoder functionality in R?

Question

In python, scikit has a great function called LabelEncoder that maps categorical levels (strings) to integer representation.

Is there anything in R to do this?

Answer 1

# input P to the function below is a dataframe containing only categorical variables
numlevel <- function(P) { 

n <- dim(P)[2]

for(i in 1: n) {

  m <- length(unique(P[[i]]))

levels(P[[i]]) <- c(1:m)

}

return(P)

}

Q <- numlevel(P)