On Fri, 1 Oct 2004, Vikas Rawal wrote: > I want to read data from a number of files into R. > Reading individual files one by one requires writing enormous amount of > code that will look something like the following. > > **************** > maptools:::dbf.read("wb-01vc.dbf")->dist1 > maptools:::dbf.read("wb-02vc.dbf")->dist2 > maptools:::dbf.read("wb-03vc.dbf")->dist3 > maptools:::dbf.read("wb-04vc.dbf")->dist4 > maptools:::dbf.read("wb-05vc.dbf")->dist5 > maptools:::dbf.read("wb-06vc.dbf")->dist6 > maptools:::dbf.read("wb-07vc.dbf")->dist7 > maptools:::dbf.read("wb-08vc.dbf")->dist8 > maptools:::dbf.read("wb-09vc.dbf")->dist9 > ***************** >
In this case, you could pre-allocate a list and: res <- vector(mode="list", length=9) for (i in 1:length(res)) res[[i]] <- maptools:::dbf.read(paste("wb-0", i, "vc.dbf", sep="")) > res <- vector(mode="list", length=9) > for (i in 1:length(res)) cat(paste("wb-0", i, "vc.dbf", sep=""), "\n") wb-01vc.dbf wb-02vc.dbf wb-03vc.dbf ... gives a check on what file names are being used. For 10 to 99 preserving the 01-09, use paste("wb-", formatC(i, width=2, flag="0"), "vc.dbf", sep=""). If the token is a character (string) that varies, you can roll out a character vector of tokens first and step along it. > res <- vector(mode="list", length=length(LETTERS)) > for (i in 1:length(res)) cat(paste("wb-", LETTERS[i], "vc.dbf", sep=""), + "\n") wb-Avc.dbf wb-Bvc.dbf wb-Cvc.dbf ... > Is there a better way of doing this? > > Vikas > > ______________________________________________ > [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 > -- Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Breiviksveien 40, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93 e-mail: [EMAIL PROTECTED] ______________________________________________ [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