How to substitute NA by 0 in 20 columns?

Question

I want to substitute NA by 0 in 20 columns. I found this approach for 2 columns, however I guess it\'s not optimal if the number of columns is 20. Is there any alternative a

Answer 1

The replace_na function from tidyr can be applied over a vector as well as a dataframe (http://tidyr.tidyverse.org/reference/replace_na.html).

Use it with a mutate_at variation from dplyr to apply it to multiple columns at the same time:

my_data %>% mutate_at(vars(b,c,e,f), replace_na, 0)

or

my_data %>% mutate_at(c('b','c','e','f'), replace_na, 0)