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

I know the question is already answered, but doing it this way might be more useful to some:

Define this function:

na.zero <- function (x) {
    x[is.na(x)] <- 0
    return(x)
}

Now whenever you need to convert NA's in a vector to zero's you can do:

na.zero(some.vector)