Try this:
x <- data.frame(u=c(1:5), seconds=sample(5)) transform(x[rep(1:nrow(x),x$seconds),], seconds = unlist(lapply(split(x$seconds, x$u), seq))) On Tue, Jun 9, 2009 at 6:11 PM, Gordon J Holtslander < gordon.holtslan...@usask.ca> wrote: > I'm new at R ... > I've not done for loops in R - so this is very new to me. > > One of our students has a data frame that contains two columns data > > 1. unixtime time of an event (in unix time - #of seconds) > 2. duration of event in seconds. > > We need to create new data - the unixtime (seconds) that these events > occurred. > > We want to create a for loop (or nested for loops) that goes through the > first column, and then creates a new unixtime value for each second of > duration for that event > > In a single row of data - > if the duration was three seconds one iteration of this loop should create > these values > > unixtime > unixtime = unixtime +1 > unixtime = unixtime +1 > unixtime = unixtime +1 > > I need these four data values (and all the successive data values created > by > the loop(s)) saved into a new dataframe > > How do I get R to create a new data object and add data to it on each > interation of the for loop. > > My test for loops only save the data from last iteration of the loop. > > Am I missing something really simple? > > Any recommended reference on loop and control structures in R? > > Thanks, > > Gord > -- > Gordon J. Holtslander > gordon.holtslan...@usask.ca > Dept. of Biology > University of Saskatchewan > tel 306 966-4433 > fax 306 966-4461 > > ______________________________________________ > R-help@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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ R-help@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.
