[R] diff of two timestamps

[Duncan Mackay]

Try

require(chron)

dat <- read.table(textConnection("Timestamp1 Timestamp2
05:24:43 05:25:05
15:47:02 15:47:22
18:36:05 18:36:24
15:21:24 15:22:04"), T)
closeAllConnections()

str(dat)
dat[,1] <- times(dat[,1])
dat[,2] <- times(dat[,2])

# numeric
as.numeric(dat[,2] <- times(dat[,2]) )

# test to get seconds from days
86400*as.numeric(dat[,2]-dat[,1])

You may want to check Rnews volume 4(1)

Regards

Duncan Mackay

At 09:50 3/09/2009, you wrote:

>Hi all,
>
>I have the following problem: I have a csv-file consisting of timestamp
>values (no dates), e.g.:
>Timestamp1;Timestamp2;
>05:24:43;05:25:05;
>15:47:02;15:47:22;
>18:36:05;18:36:24;
>15:21:24;15:22:04;
>
>I need a vector with the difference of the two timestamps, so I read the
>data with the read.csv-function:
>myObj <- read.csv("file.csv",header=TRUE,sep=";").
>
>I have then tried unsuccessfully to convert the data to time format (e.g.
>using the strptime function like date1 <-
>strptime(myObj[0],format="%H:%M:%S")) to be able to perform a datediff
>operation.
>
>I would be very grateful if anybody could give me some assistance.
>
>Thanks in advance,
>Ieyasu
>--
>View this message in context: 
>http://www.nabble.com/diff-of-two-timestamps-tp25267603p25267603.html
>Sent from the R help mailing list archive at Nabble.com.
>
>______________________________________________
>R-help at r-project.org mailing list
>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.