I would like to change all the NA to "" in a data.frame made of string. I tried to use the mutate\_each function of Dplyr package but it doesn't work (I get numbers in place of the strings).

```
Df_with_NA <- as.data.frame(rbind(c("toto", "titi", NA, NA), c("tata", "tztz", "tutu", NA), c("toto","titi", "tutu", "tyty")))

empty_as_na <- function(x){
  ifelse(is.na(x), "", x)
}

Df_with_empty_string_instead_of_NA <- Df_with_NA %>% mutate_each(funs(empty_as_na)) 

```

Can you tell me what is wrong ?

Thank