How do I replace NA values with zeros in an R dataframe?

Question

I have a data frame and some columns have NA values.

How do I replace these NA values with zeroes?

Answer 1

Dedicated functions, nafill and setnafill, for that purpose is in data.table. Whenever available, they distribute columns to be computed on multiple threads.

library(data.table)

ans_df <- nafill(df, fill=0)

# or even faster, in-place
setnafill(df, fill=0)