Hi Jim and everyone else, Mhm, no this is not what I am looking for. I think in your way I would randomly sample two values of day 1 and of day 2. But I want the opposite: I want to randomly draw two successive (!) days and put those values in a new dataframe to continue working with them.
In my real data I do have a huge time span and I want to draw 25 consecutive days. So maybe my example was a little misleading. And now that I read it again my text was, too. Sorry about that! Good try though and I am very gratefull for your good will to help me Would anyone give another try? Dagmar Am 07.12.2018 um 10:30 schrieb Jim Lemon: > Hi Dagmar, > This will probably involve creating a variable to differentiate the > two days in each data.frame: > > myframe$day<-as.Date(as.character(myframe$Timestamp),"%d.%m.%Y %H:%M:%S") > days<-unique(myframe$day) > > Then just sample the two subsets and concatenate them: > > myframe[c(sample(which(myframe$day==days[1]),2), > sample(which(myframe$day==days[2]),2)),] > > Jim > > > On Fri, Dec 7, 2018 at 8:08 PM Dagmar Cimiotti > <dagmar.cimio...@ftz-west.uni-kiel.de> wrote: >> Dear all, >> >> I have data from a time span like this: >> >> myframe <- data.frame (Timestamp=c("24.09.2012 09:00:00", "24.09.2012 >> 10:00:00","25.09.2012 09:00:00", >> "25.09.2012 >> 09:00:00","24.09.2012 09:00:00", "24.09.2012 10:00:00"), >> Event=c(50,60,30,40,42,54) ) >> myframe >> >> >> I want to create a new dataframe which includes in this example the >> data from two successive days (in my real data I have a big time span >> and want data from 25 consecutive days). I understand that I can do a >> simple sample like this >> >> mysample <- myframe[sample(1:nrow(myframe), 4,replace=FALSE),] >> mysample >> >> But I need the data from consecutive days in my random sample. Can >> anyone help me with this? >> >> >> Many thanks in advance, >> Dagmar >> >> ______________________________________________ >> 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. [[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.