[R] Reading and converting time data via read.table

[PIKAL Petr]

Hi

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Ek Esawi
> Sent: Sunday, June 5, 2016 2:54 PM
> To: r-help at r-project.org
> Subject: [R] Reading and converting time data via read.table
>
> 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.

If you used strptime for converting your datae/time value you can tune it by format to be able to read differently formated data.


> strptime("01/02/1999, 12:30:20", format="%d/%m/%Y, %H:%M:%S")
[1] "1999-02-01 12:30:20 CET"
> strptime("01/02/1999, 12:30", format="%d/%m/%Y, %H:%M")
[1] "1999-02-01 12:30:00 CET"
> strptime("01/02/1999, 12", format="%d/%m/%Y, %H")
[1] "1999-02-01 12:00:00 CET"
>

> str(strptime("01/02/1999, 12", format="%d/%m/%Y, %H"))
 POSIXlt[1:1], format: "1999-02-01 12:00:00"
>

Regards
Petr


> 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]]
>
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