Much thanks, Hadley! Cheers, Alan
On Jan 29, 2015, at 12:36 PM, Hadley Wickham wrote: > On Thu, Jan 29, 2015 at 11:43 AM, Alan Yong <alany...@caltech.edu> wrote: >> Much thanks to everyone for their recommendations! I agree that fishing in >> the global environment isn't ideal & only shows my budding understanding of >> R. >> >> For now, I will adapt Chel Hee's "length(eval(parse(text=DFName))[,1])" >> solution then fully explore Jeff's suggestion to put the data frames into a >> list. > > If you have to go down this route, at least do nrow(get(DFName)) > >> (1) Add a column to each data frame with a string that is parsed from the >> appendage of the data frame name, i.e., string is "1001" from data frame >> object of "df.1001"; then, >> (2) Bind the rows of all the files. > > I'd highly recommend learning a little functional programming such as > the use of lapply (e.g. http://adv-r.had.co.nz/Functionals.html). > Then you can easily do: > > csvs <- dir(pattern = "\\.csv$") > all <- lapply(csvs, read.csv) > one <- do.call("rbind", all) > > to find all the csv files in a directory, load into a list and then > collapse into a single data frame. > > You're much better off learning how to do this than futzing around > with named objects in the global environment. > > Hadley > > -- > http://had.co.nz/ ______________________________________________ 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.
