如何从R中的Year-Month(2017-10)类型的对象中提取月份? [英] How to extract month from a Year-Month (2017-10) type object in R?
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问题描述
此对象为字符格式,我想避免通过基于字符串的函数提取10,因为它非常麻烦.如果有一种通过as.Date()和某种特定格式的方法,我很乐意使用该方法
This object is in character format and i would like to avoid extracting the 10 by string based functions since it is very cumbersome. If there is a way through as.Date() and some particular format, i would be happy to use that
推荐答案
我相信以前在SO上已经问过这个问题.
I believe this question has been asked before on SO.
可以随时使用 lubridate
library(lubridate)
format(ymd("2017-10", truncated = 1L), "%m")
或以R为底基
format(as.Date(paste0("2017-10", "-01")), "%m")
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