As far as I know, base R does not have a class for storing times that are not associated with a date, and recognizing that they are times. That being the case, I don't think there is a way to convert them to some sort of time class while reading them into R using read.table(). I would read them into R as character strings, and then convert them (it would take only a few extra lines of code). How you convert them depends on the next question, which is:
What do you need to do with those times? For example, are T1 and T2 the times associated with two events that both occurred on the specified Date? If that is the case, I would probably form two POSIXct variables by combining the Date with T1 and the Date with T2. Or, do you just need to be able to sort your data by T1, or by T2? Or do you need to calculate the time differences (such as T2-T1) to get the number of minutes between those two times? -Don -- Don MacQueen Lawrence Livermore National Laboratory 7000 East Ave., L-627 Livermore, CA 94550 925-423-1062 On 6/5/16, 5:53 AM, "R-help on behalf of Ek Esawi" <r-help-boun...@r-project.org on behalf of esaw...@gmail.com> wrote: >Hi All-- > > > >I am relatively new to R. I am reading a csv file via read.table (MyFile). >The data types in the file are date, string, integer, and time. I was able >to read all the data and manipulated correctly except time, e.g., 12:30. I >used as.Date to convert date and string and integer were easily done. I >could not figure out how to convert the time data correctly. I tried chron >but w/o success and I read that POSIXlt and POSIXct work only for date and >time (e.g. 01/02/1999, 12:30:20). I did not try the lubridate package. Is >there a way to read time data without date attached to it like mine? > > > >I am grateful for any help and thanks in advance‹EKE > > > >Here is an example of my data when read into R via read.table > > > > AA Date Name T1 T2 >N1 > >1 312171 7/1/1995 OF 13:37 1:43 123 > > [[alternative HTML version deleted]] > >______________________________________________ >R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide >http://www.R-project.org/posting-guide.html >and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
