The difference of two POSIXct values is of type difftime. You should not think
of difftime as having units. Rather, you should think of the result of
converting from difftime to numeric (using as.numeric) as the opportunity (or
rather requirement) to specify what time units you want. If you let R print
the difftime object unconverted, it will print with whatever units seem
appropriate given the magnitude of the difftime.
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"MacQueen, Don" <macque...@llnl.gov> wrote:
>I think you probably want
> format='%m/%d/%y %H:%M')
>(lower case "y")
>
>diff() as suggested by Jeff Newmiller is good, except that I don't know
>how to control the units using diff().
>
>## so a method that allows specifying units other than hours would be,
>for
>example,
>
>datetime <-c("1/1/13 00:00","1/1/13 12:00","1/2/13 00:00","1/2/13
>12:00")
>datetime <-as.POSIXct(datetime,format='%m/%d/%y %H:%M')deltas <-
>difftime(
>datetime[-1], datetime[-length(datetime)] , units='min')
>
>-Don
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