well, first you could have a look at ?"[.data.frame" ?subset
and then check the following: dat <- data.frame(year = sample(seq(2000, 2008, 2), 100, TRUE), y = rnorm(100)) subset(dat, year == 2002) dat[dat$year == 2002, ] # or subset(dat, year > 2002) dat[dat$year > 2002, ] I hope it helps. Best, Dimitris > > I'm new to R, using it for an engineering stats class, and the first > project > is focused on creating data frames and plotting graphs. So far I have > imported a set of data from a text file and saved it as a variable (using > the read.table() function). One of the columns of the data consists of > years, and I'm supposed to create a data frame that only consists the the > date from one given year (ie. I need to scan the Year column, pick out the > specific year, and include those rows). I'm pretty sure I have to use > data.frame() to do this, but I don't know what arguments would pick out > rows > from a particular year (and keep the headers of the columns intact in the > new data frame). Beyond this, I need to plot it and export it to an image > file, which I can do myself. > > Can someone please tell me the arguments to data.frame() that would > achieve > this (or better yet, point me to a good list of functions and arguments in > addition to this). > > Thanks for your help, > > Josh > -- > View this message in context: > http://www.nabble.com/Creating-data-frame-from-existing-data-frame-tp19449005p19449005.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. > -- Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014 ______________________________________________ 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.
