Hm. We also do not know what will be done with those files. Save/load is an option but in that case nothing prevents you to use original file and read.* function interactively. I understood that OP wanted to load all files as 75 objects into one R session environment. In that case having one object is preferable if memory alows. I did not find if memory limit for list object is different from memory limit of a vector. So if any list has 2^31 - 1 limit and also individual parts of this list has separate limit or if this is the overall limit for any list including its parts. Petr From: Lisa S [mailto:lisha.sheng@gmail.com] Sent: Thursday, March 20, 2014 10:24 AM To: PIKAL Petr Cc: ajaykumar; r-help@r-project.org Subject: Re: [R] Import multiple files into R But I don't think a list can contain that much data - we dont know how big each txt file is. So I'd like to do: city.set <- c('Asheville','Charlotte') month.set <- c('Dec', 'Jan', 'Feb') comb.set <- expand.grid(city.set,month.set) comb.set$filename = paste(comb.set[,1],comb.set[,2],sep = '_') for i in 1:nrow(comb.set){ db <- read.table(comb.set$filename[i] + '.txt',header = TRUE) save(db,filename + '.dat') rm(db) } So that each file is saved in a .dat file as a data frame, and she only need to load and remove whenever she uses the file. On Thu, Mar 20, 2014 at 5:14 PM, PIKAL Petr > wrote: Hi Best way is to put those files in one directory and start R from this directory or set this directory as working one. ?set.wd Then you can use list.files() to get file names. ?list.files myfiles<-list.files() Than strip txt. E.g. by filenames<-strsplit(list.files(), "\\.")) After that you can use for cycle to read all files, however I would prefer list structure. files<-vector(mode="list", length(myfiles)) for (i in 1:length(myfiles)) { files[[i]]<-read.table(myfiles[i]) names(files)[[i]]<-filenames[[i]][1] } Instead of 75 objects you will get one list object and you can easily use interactively or programmatically its parts. Regards Petr > -----Original Message----- > From: r-help-bounces@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of ajaykumar > Sent: Thursday, March 20, 2014 6:15 AM > To: r-help@r-project.org > Subject: [R] Import multiple files into R > > Hi I want to import around 75 files. Each file has a name and a time > and is comma separated. > For example some of my file names are > Asheville_Dec.txt > Asheville_Jan.txt > Asheville_Feb.txt > Charlotte_Dec.txt > Chapelhill_Jan.txt > > The time months are only Dec Jan and Feb. The locations are different. > I have data for these 3 months at 25 cities which I want to import in R > I don't want to use read.table 75 times and keep changing names. > > Is there any way I can keep all the city names in an object and the > three months in another object and then use a loop over read.table of > location_time.txt I would also like to view them as 75 different data > sets in R So the file Asheville_Dec must be in a dataset called > Asheville_Dec in R > > Can this be done. > Please help > > > > -- > View this message in context: http://r.789695.n4.nabble.com/Import- > multiple-files-into-R-tp4687178.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. ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. 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