Not Available (how to put information in this position) [closed]

The best way to give an example of data, in this case a data.frame is to use the command dput :

dput(dat)  # postar o output disto

Let's first produce a% example.

set.seed(2174)
dat <- data.frame(X <- rnorm(10),
            A = sample(letters[1:4], 10, TRUE),
            stringsAsFactors = FALSE)
dat$X[c(2,4,7)] <- NA

Now we have everything we need. Suppose we have data.frame for valor .

inx <- is.na(dat$X)
dat$X[inx] <- valor  # 'valor' deve ser numérico

Hello @Bianca, try the coalesce function of the dplyr package. It replaces all NA's with the indicated value, in the example below it is zero:

x <- sample(c(1:5, NA, NA, NA))
dplyr::coalesce(x, 0L)