带有OR条件dplyr的mutate_if（）

Question

If I want to convert an integer or double variables to character variables, how can I accomplish the task, I tried the below code, but I am certain this is an incorrect way.

storms %>% mutate_if(c(is.integer | is.double),
                     .funs = as.character)

Answer 1

You can use this version of mutate_if

library(dplyr)
storms %>% mutate_if(~ is.double(.) | is.integer(.), as.character)

which would convert the double or integer columns to character.

Answer 2

We can do this with base R

storms[] <- lapply(storms, function(x) if(is.numeric(x)) as.character(x) else x)

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Or using data.table

library(data.table)
setDT(storms)[, names(storms) := lapply(.SD, function(x) 
        if(is.numeric(x)) as.character(x) else x)]