search for: substitute_na

...bles as leftmost columns). Using rbind.fill from the reshape package on two data frames I would get a data frame like trg_type child_type_1 1 Scientists NA 2 of used Now to get rid of NA values I use the following function, which works for data frames with only factor values: substitute_na <- function(tok, na_factor_level = "NOT_REALIZED") { for (i in 1:length(tok)) {levels(tok[,i]) <- c(levels(tok[,i]), na_factor_level)} tok[is.na(tok)] <- as.factor(na_factor_level) return(tok) } Is there a better/faster way to do it? It would also be great to be ab...