Sent from my phone. Please excuse my brevity.
On June 8, 2016 10:20:38 AM PDT, "MacQueen, Don" <macqueen1 at llnl.gov> wrote:
>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-bounces at r-project.org on behalf of esawiek at 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
>>
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>>
>>______________________________________________
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>>PLEASE do read the posting guide
>>http://www.R-project.org/posting-guide.html
>>and provide commented, minimal, self-contained, reproducible code.
>
>______________________________________________
>R-help at 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.
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