如何在小时，时间，秒列中中断时间（因子类型-HH：MM：SS）？ IN R

Question

I have a dataset with a column time(HH:MM:SS-ZZ). The time is of class factor. I want to create new column for hour, min, sec(class:numeric) in the dataset. How can i do that ..any thoughts?

Answer 1

Just use strsplit function:

strsplit("23:52:23-09", "[:-]")

A complete example:

a<-data.frame(Date=c("04:52:00-09", "03:22:23-09", 
                     "23:00:23-09", "15:12:23-09"), Dummy=1:4)
b<-data.frame(strsplit(as.character(a$Date), "[:-]"))
colnames(b)<-c("HH", "MM", "SS", "ZZ")

Should do it.

Answer 2

Create a factor datetime variable to demonstrate:

test <- as.factor(Sys.time())

Load the lubridate package:

library(lubridate)

Extract the different parts:

hour(test)
minute(test)
second(test)