On Thu, Oct 4, 2012 at 3:20 PM, Ian Arvin <[email protected]> wrote: > Hi, > > > I am making my way down the learning curve of R, and find it a great > language with so many helpful users!
Up it hopefully, no? > > Below is an example of what I'm trying to do, but can't quite figure out the > right path to go down. > > > > Here's what I have: > > > > Main is a time series of data with columns Cola and Colb > > Cola Colb > > 1 1 1 > > 2 1 1 > > 3 1 1 > > 4 -1 1 > > 5 -1 -1 > > 6 -1 -1 > > 7 1 -1 > > 8 -1 -1 > > 9 -1 -1 > > 10 -1 -1 > > > > What I would like is to subset the data into groups - rows 1-3 into one > group (Cola and Colb both =1), then row 4 by itself, then rows 5-6, then row > 7, then rows 8-10. > > Group 1 > > Cola Colb > > 1 1 1 > > 2 1 1 > > 3 1 1 > > > > Group 2 > > Cola Colb > > 1 -1 1 > > > > Group 3 > > Cola Colb > > 1 -1 -1 > > 2 -1 -1 > > > Short answer is to ask why you want to do this? There are many functions which operate on the split-->apply-->combine paradigm (see the JSS article of that name for a short intro) but I find it easier to do this in conjunction with specifying what my data transformation is. To directly answer your question, you'll probably need to combine split() and interaction() in some way. Cheers, Michael ______________________________________________ [email protected] 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.
