Is this what you want: > my.df <- data.frame(a = c(1:5, 1:10, 1:20), b = runif(35)) > split(my.df, c(0, cumsum(diff(my.df$a) < 0))) $`0` a b 1 1 0.2655087 2 2 0.3721239 3 3 0.5728534 4 4 0.9082078 5 5 0.2016819
$`1` a b 6 1 0.89838968 7 2 0.94467527 8 3 0.66079779 9 4 0.62911404 10 5 0.06178627 11 6 0.20597457 12 7 0.17655675 13 8 0.68702285 14 9 0.38410372 15 10 0.76984142 $`2` a b 16 1 0.49769924 17 2 0.71761851 18 3 0.99190609 19 4 0.38003518 20 5 0.77744522 21 6 0.93470523 22 7 0.21214252 23 8 0.65167377 24 9 0.12555510 25 10 0.26722067 26 11 0.38611409 27 12 0.01339033 28 13 0.38238796 29 14 0.86969085 30 15 0.34034900 31 16 0.48208012 32 17 0.59956583 33 18 0.49354131 34 19 0.18621760 35 20 0.82737332 > On Tue, Sep 9, 2008 at 5:38 AM, David Carslaw <[EMAIL PROTECTED]> wrote: > > Hi all, > > Given a data frame: > > my.df <- data.frame(a = c(1:5, 1:10, 1:20), b = runif(35)) > > I want to split it by "a" such that I end up with a list containing 3 > components i.e. the first containing a = 1 to 5, the second a = 1 to 10 etc. > In other words, sets of sequences of a. > > I can't seem to find the right form using the split function - can you help? > > Much appreciated. > > David > > > > ----- > Institute for Transport Studies > University of Leeds > -- > View this message in context: > http://www.nabble.com/how-to-split-a-data-framed-with-sequences-tp19388964p19388964.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? ______________________________________________ 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.