问题描述
我有一些年份格式的数据，我想将这些数据格式化为 ggplot 。
I have some data in year-month form that I want to format for graphing in ggplot.
date <- c("2016-03", "2016-04", "2016-05", "2016-06", "2016-07", "2016-08",
"2016-09", "2016-10", "2016-11", "2016-12")
我使用的是 parsedate :: parse_date ，但是由于更新了R，它不再起作用。
I was using parsedate::parse_date, but since updating R it no longer functioning.
我看过
as.yearmon 中设置日期格式（年月）可以正常工作，但它不会格式化为 ggplot 所需的POSIXct。其他格式，例如 as.POSIXct 和 strptime 给出NA或错误。
as.yearmon works fine but it doesn't format to POSIXct which I need for ggplot. Other formatting such as as.POSIXct and strptime are giving NAs or errors.
注意：我不介意每月的第一天是否添加为 year-mo格式。
Note: I don't mind if the first of the month gets added to the "year-mo" format.
推荐答案
这是一个常见问题解答：日期由日期，月份和年份组成。您缺少一部分。因此，通过添加 a 天，例如 -01，您可以添加缺少的字符串结构并进行解析。或者，您可以使用更宽容的解析器：
That's a FAQ: a date is comprised of day, month and year. You are missing one part. So by adding a day, say, '-01', you can impose the missing string structure and parse. Or you can use a more tolerant parser:
R> library(anytime)
R> anydate("2017-06")
[1] "2017-06-01"
R>
哪个也可以为您的数据服务：
Which works for your data too:
R> date
[1] "2016-03" "2016-04" "2016-05" "2016-06"
[5] "2016-07" "2016-08" "2016-09" "2016-10"
[9] "2016-11" "2016-12"
R> anydate(date)
[1] "2016-03-01" "2016-04-01" "2016-05-01"
[4] "2016-06-01" "2016-07-01" "2016-08-01"
[7] "2016-09-01" "2016-10-01" "2016-11-01"
[10] "2016-12-01"
R>
最后，您对 POSIXct 类型的请求仍然很短第二。但是按照相同的原则：
Lastly, your request for POSIXct type is still short an hour, minute and second. But by the same principle:
R> anytime(date)
[1] "2016-03-01 CST" "2016-04-01 CDT"
[3] "2016-05-01 CDT" "2016-06-01 CDT"
[5] "2016-07-01 CDT" "2016-08-01 CDT"
[7] "2016-09-01 CDT" "2016-10-01 CDT"
[9] "2016-11-01 CDT" "2016-12-01 CST"
R>
这两个函数返回正确的 Date 和 POSIXct 类型。
These two functions return proper Date and POSIXct types, respectively.
这篇关于将年月格式设置为POSIXct的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！