R: Converting data frame of percentages from factor to numeric

Question

Running into issues converting a data frame into R.

I have a bunch of columns that were read as factors and have % symbols with them.

I

Answer 1

Here is an option using set from data.table, which would be faster for big datasets as the overhead of [.data.table is avoided

library(stringi)
library(data.table)

setDT(df)
for(j in 2:ncol(df)){
     set(df, i=NULL, j=j, value= as.numeric(stri_extract(df[[j]], regex='\\d+')))
}

df
#     Year v1 v2 v3 v4
#1: 12-Oct  0  0 39 14
#2: 12-Nov  0  6 59  4
#3: 12-Dec 22  0 37 26
#4: 13-Jan 45  0 66 19
#5: 13-Feb 28 39 74 13