处理R中的5分钟30秒等时间段 [英] Dealing with time-periods such as 5 minutes and 30 seconds in R

问题描述

在R中是否有一种很好的方法来处理诸如05:30(5分钟30秒)之类的时间段?

Is there a good way to deal with time periods such as 05:30 (5 minutes, 30 seconds) in R?

或者，仅用几秒钟即可将其转换为整数的最快方法是什么?

Alternatively what's the fastest way to convert it into an integer with just seconds?

我只能转换为日期，而不能真正找到时间的数据类型.

I can only convert to dates and can't really find a data type for time.

我在动物园中使用R.

非常感谢！

秒是处理此问题的最佳方法.我将以下Shane的代码进行了调整以满足自己的目的，这就是结果.

Seconds was the best way to deal with this. I adapted Shane's code below to my purposes, here's the result.

# time - time in the format of dd hh:mm:ss
#       (That's the format used in cvs export from Alcatel CCS reports)
#
time.to.seconds <- function(time) {

   t <- strsplit(as.character(time), " |:")[[1]]
   seconds <- NaN

   if (length(t) == 1 )
      seconds <- as.numeric(t[1])
   else if (length(t) == 2)
      seconds <- as.numeric(t[1]) * 60 + as.numeric(t[2])
   else if (length(t) == 3)
      seconds <- (as.numeric(t[1]) * 60 * 60 
          + as.numeric(t[2]) * 60 + as.numeric(t[3]))   
   else if (length(t) == 4)
      seconds <- (as.numeric(t[1]) * 24 * 60 * 60 +
         as.numeric(t[2]) * 60 * 60  + as.numeric(t[3]) * 60 +
         as.numeric(t[4]))

   return(seconds)
}

推荐答案

正如Dirk指出的那样，存在一个名为"difftime"的对象，但是无法添加/减去该对象.

As Dirk points out, there is an object called "difftime", but it can't be added/subtracted.

> as.difftime(5, units="mins")
Time difference of 5 mins

> d <- seq(from=as.POSIXct("2003-01-01"), to=as.POSIXct("2003-01-04"), by="days")
> d
[1] "2003-01-01 GMT" "2003-01-02 GMT" "2003-01-03 GMT" "2003-01-04 GMT"

> d + as.difftime(5, units="mins")
[1] "2003-01-01 00:00:05 GMT" "2003-01-02 00:00:05 GMT"
[3] "2003-01-03 00:00:05 GMT" "2003-01-04 00:00:05 GMT"
Warning message:
Incompatible methods ("+.POSIXt", "Ops.difftime") for "+" 

似乎您现在可以执行此操作:

Seems you can now do this:

  > as.difftime(5, units='mins')
    Time difference of 5 mins
    > d <- seq(from=as.POSIXct("2003-01-01"), to=as.POSIXct("2003-01-04"), by="days")
    > d 
    [1] "2003-01-01 GMT" "2003-01-02 GMT" "2003-01-03 GMT" "2003-01-04 GMT"
    > d + as.difftime(5, unit='mins')
    [1] "2003-01-01 00:05:00 GMT" "2003-01-02 00:05:00 GMT"
    [3] "2003-01-03 00:05:00 GMT" "2003-01-04 00:05:00 GMT"
    > d + as.difftime(5, unit='secs')
    [1] "2003-01-01 00:00:05 GMT" "2003-01-02 00:00:05 GMT"
    [3] "2003-01-03 00:00:05 GMT" "2003-01-04 00:00:05 GMT"
   >

这与最近发布的R 2.15.0一起

This is with the recently released R 2.15.0

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