描述

    replace_na_dt可以将所有NAs替换为另一个值，而replace_dt可以将任何值替换为另一个特定的值。

    Usage

    replace_dt(.data, …, from = is.nan, to = NA)

    1. iris %>% mutate_vars(is.factor,as.character) -> new_iris
    2. new_iris %>%
    3.   replace_dt(Species, from = "setosa",to = "SS")
    5. new_iris %>%
    6.   replace_dt(Species,from = c("setosa","virginica"),to = "sv")
    8. new_iris %>%
    9.   replace_dt(Petal.Width, from = .2,to = 2)
    11. new_iris %>%
    12.   replace_dt(from = .2,to = NA)
    14. new_iris %>%
    15.   replace_dt(is.numeric, from = function(x) x > 3, to = 9999 )