问题描述
lubridate中的一个简单问题-我想将hms对象转换为自一天开始以来的适当秒数.
simple question in lubridate--I want to convert an hms object into its appropriate number of seconds since the start of the day.
例如
library(lubridate)
hms("12:34:45")
那我想确切地知道12个小时34分45秒以秒为单位
then I want to know exactly how long 12 hours, 34 minutes, and 45 seconds is, in seconds
明显的东西
seconds(hms("12:34:45"))
只是回报
45s
这不是我想要的.如何将这些hms值转换为秒?我想使用lubridate
which is not what I want. How do I convert these hms values into seconds? I'd like to use lubridate
推荐答案
使用哪个包都没关系-它将把日期/日期时间对象转换为自纪元以来的秒的POSIXct表示形式.因此,您也可以在基本R中执行此操作-因此,请在今天使用任意一天部署ISOdatetime()
:
It doesn't matter which package you use -- it will have convert a date / datetime object into a POSIXct representation of seconds since the epoch. So you may as well do it in base R -- so here deploy ISOdatetime()
with an arbitrary day, using today:
R> difftime(ISOdatetime(2012,7,2,12,34,45), ISOdatetime(2012,7,2,0,0,0))
Time difference of 12.5792 hours
所以我们要秒:
R> difftime(ISOdatetime(2012,7,2,12,34,45), ISOdatetime(2012,7,2,0,0,0),
+ unit="secs")
Time difference of 45285 secs
我们可以转换为数字:
R> as.numeric(difftime(ISOdatetime(2012,7,2,12,34,45), +
ISOdatetime(2012,7,2,0,0,0), unit="secs"))
[1] 45285
回到润滑状态,这可以说是一个错误:
And getting back to lubridate, this is arguably a bug:
> hms("12:34:45") - hms("00:00:00")
[1] 12 hours, 34 minutes and 45 seconds
R> as.numeric(hms("12:34:45") - hms("00:00:00"))
[1] 45
R>
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