Set certain values to NA with dplyr

Question

I\'m trying to figure out a simple way to do something like this with dplyr (data set = dat, variable = x):

day$x[dat$x<0]=NA

Should be

Answer 1

The most natural approach in dplyr is to use the na_if function.

For one variable:

dat %<>% mutate(x = na_if(x, x < 0))

For all variables:

dat %<>% mutate_all(~ na_if(., . < 0))

If interested in replacing a specific value, instead of a range for all variables:

dat %<>% mutate_all(na_if, 0)

Note that I am using the %<>% operator from the magrittr package.