Hi,
I checked the same with strptime. It is the rounding issue.
Try this:
dat1<-data.frame(datetime=c("2012-06-15 16:32:39.0025 CEST","2012-06-15
16:32:39.0086 CEST"))
op<-options(digits.secs=4)
dat1$datetime<- strptime(dat1$datetime, "%Y-%m-%d %H:%M:%OS")
formatC(as.numeric(difftime(dat1[2,1],dat1[1,1],units="secs")),format="f",digits=4)
[1] "0.0061"
#or,
formatC(as.numeric(diff(dat1$datetime)),format="f",digits=4)
[1] "0.0061"
A.K.
----- Original Message -----
From: Julia <julia.schm...@gmx.de>
To: r-h...@stat.math.ethz.ch
Cc:
Sent: Friday, June 15, 2012 12:49 PM
Subject: [R] Wrong computation of time differenze in POSIXct - additional digits
Hello,
I wanted to compute the time differenze between to times:
first =as.POSIXct( "2012-06-15 16:32:39.0025 CEST")
second = as.POSIXct("2012-06-15 16:32:39.0086 CEST")
second - first
The result is
Time difference of 0.006099939 secs
instead of just 0.0061 secs
So R adds aditional numbers after the result.
I know I could round it in this case.
But I am working with a large data set and need to always get the
correct result.
difftime() does not work correct either.
Has anybody a suggestion how to get the correct result?
Thank you
Julia
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