Hi I am not completely sure what you want.
Maybe something like datframe$datum<-strptime(paste(datframe[,1], datframe[,2]), format="%d.%m.%Y %H:%M") datframe$datum <- strptime(format(datframe$datum, "%d.%m.%Y %H"), format="%d.%m.%Y %H") datframe$datum<-as.POSIXct(datframe$datum) dat<-seq(min(datframe$datum), by="hour", length.out=50) temp<-data.frame(dat=dat) myframe <- merge(datframe, temp, by.x="datum", by.y="dat", all=TRUE) can help you a bit. You can fill missing tides by e.g. na.locf from zoo package. I know that it is not exactly what you wanted, however it seems to me that having data frame with equally spaced time can be better approach than dividing unequal intervals to 6 portions. Cheers Petr > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Dagmar > Sent: Thursday, December 03, 2015 11:52 AM > To: R help > Subject: [R] expand dataframe but time gap is not the same > > Hello, > I hope someone can help me with my problem: > I have a dataframe like this: > > datframe <- data.frame(dates=c("02.08.2013","03.08.2013","03.08.2013"), > times =c("22:10","4:04", "10:18"), tide =c("NW","HW", "NW")) > datframe > Timestamp <- paste(datframe$dates, datframe$times) > myframe2 <- cbind( Timestamp,datframe) > head(myframe2) > myframe2$dates <- NULL > myframe2$times <- NULL > myframe2$Timestamp <- as.POSIXct (strptime(myframe2$Timestamp, > "%d.%m.%Y > %H:%M"), tz="GMT") > head(myframe2) > str(myframe2) > > # In the end I want a frame like this: > datframeres <- data.frame(Timestamp=c("2013-08-02 22:10:00", "2013-08- > 02 > 23:09:00","2013-08-03 00:08:00","2013-08-03 01:07:00", "2013-08-03 > 02:06:00", "2013-08-03 03:05:00", > "2013-08-03 04:04:00","2013-08-03 05:06:20","2013-08-03 06:08:40", > "2013-08-03 07:11:00", "2013-08-03 08:13:20", "2013-08-03 09:15:40", > "2013-08-03 10:18:00") > , tidalclass =c("NW", "HW-5","HW-4", "HW-3", "HW-2", "HW-1", "HW", > "HW+1","HW+2","HW+3", "HW+4","HW+5", "NW")) > > datframeres > > # That means: I want to expand to 13 classes instead of the two classes > "HW" and "NW": "HW", "HW+1", "HW+2" and so on. > # The time gap between HW and NW is not always quite the same (always > around 6 hours). So I would divide the time gap by 6 and add this > number > (0:59 and 1:02:20 respectively) to the timestamp before. > # I do not know how to do this. Does anyone know how to do this? Many > thanks in advance! > Tagmarie > > ______________________________________________ > 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. ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému. Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat. 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