我在下面的Date列中有字符(来自ENTSO-E平台(。我想转换为Date并提取此间隔的结束部分([1]"01.01.2021 00:00-01.01.2021 01:00"(。我收到错误";明确格式的字符串";。有什么建议吗?我如何将字符格式的间隔的第二部分提取为R中的Date变量?
head(date)
- "01.01.2021 00:00-01.01.2021 01:00">
- "01.01.2021 01:00-01.01.2021 02:00">
- "01.01.2021 02:00-01.01.2021 03:00">
- "01.01.2021 03:00-01.01.2021 04:00">
- "01.01.2021 04:00-01.01.2021 05:00">
- "01.01.2021 05:00-01.01.2021 06:00">
Error in as.POSIXlt.character(x, tz, ...) : character string is not in a standard unambiguous format
as.POSIXct(gsub("^.* - (.*)", "\1", x), format = "%d.%m.%Y %H:%M")
# [1] "2021-01-01 01:00:00 CET" "2021-01-01 02:00:00 CET" "2021-01-01 03:00:00 CET" "2021-01-01 04:00:00 CET"
# [5] "2021-01-01 05:00:00 CET"
样本数据
x <- c("01.01.2021 00:00 - 01.01.2021 01:00",
"01.01.2021 01:00 - 01.01.2021 02:00",
"01.01.2021 02:00 - 01.01.2021 03:00",
"01.01.2021 03:00 - 01.01.2021 04:00",
"01.01.2021 04:00 - 01.01.2021 05:00")
这里是tidyverse
与lubridate
的dmy_hm
函数的组合:
library(lubridate)
library(dplyr)
library(tidyr)
df %>%
separate(date, c("a", "date"), " - ") %>%
mutate(date = dmy_hm(date), .keep="used")
date
<dttm>
1 2021-01-01 01:00:00
2 2021-01-01 02:00:00
3 2021-01-01 03:00:00
4 2021-01-01 04:00:00
5 2021-01-01 05:00:00
6 2021-01-01 06:00:00