CODEWITHSUNDEEP
rlubridate
dagcilibili
dagcilibili

Reputation: 491

Using select function, piping and lubridate

I am trying to use lubridate package along with the select function and piping provided in the tidyverse package for viewing the days in the dates. However, I cannot get it to work while using select. I thought I could use select instead of using the $ operator. What is the problem here?

library(tidyverse)
library(lubridate)
> df <- data.frame(arrivals = c("2015-11-11","2015-11-12"))
> df$arrivals %>% day()
[1] 11 12
> df %>% select(arrivals) %>% day()
Error in as.POSIXlt.default(x, tz = tz(x)) : 
  do not know how to convert 'x' to class “POSIXlt”

Upvotes: 0

Views: 1043

Answers (1)

Jul
Jul

Reputation: 1139

df$arrivals returns a vector whilst df %>% select(arrivals) returns a data.frame which lubridate apparently can't work with.

Using the mutate function instead gives the following:

> df %>% mutate(day(arrivals))
    arrivals day(arrivals)
1 2015-11-11            11
2 2015-11-12            12

Upvotes: 2

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