Each dataframe is a gridded file, so I want to add the values at corresponding grid cells from all the dataframes.
On Mon, Mar 25, 2019 at 6:22 PM Rui Barradas <ruipbarra...@sapo.pt> wrote: > Sorry, I forgot to ask something. > > When you say you want to add the df's values, what exactly do you mean? > All of the values, by row, by column, what? > > Rui Barradas > > Às 10:20 de 25/03/2019, Rui Barradas escreveu: > > Hello, > > > > Maybe something like this? > > Note that you *never* need to set header = FALSE, it already is the > > default of read.table. You would have to with read.csv. > > > > > > old_dir <- setwd("~/directory") > > f1990 <- list.files(pattern = "^199.*\\.txt$") > > r1990 <- lapply(f1990, read.table) > > setwd(old_dir) > > > > > > Hope this helps, > > > > Rui Barradas > > > > > > Às 08:30 de 25/03/2019, lily li escreveu: > >> Hi R users, > >> > >> I have multiple dataframes in a directory, and with the same postfix > >> ".txt". Each dataframe is a gridded file with just values, but each > value > >> represents one grid cell. There are many years, and each year has 12 > >> months, so there are many such files. For each year, I want to read the > >> corresponding year's files and add the values of the dataframes, but I > >> don't know how to do that. For example, the file names are > >> 1990_file01.txt > >> 1990_file02.txt > >> ... > >> 1990_file12.txt > >> 1991_file01.txt > >> ... > >> 1991_file12.txt > >> ... > >> > >> And my code is like this: > >> f1990 = list.files("~/directory", pattern = "^1990(.*).txt$") > >> for(i in 1:length(f1990)){ > >> r1990 = read.table(paste('~/directory',f1990[i],sep='/'),head=F) > >> } > >> > >> Could you provide some help on this? Thanks very much. > >> > >> [[alternative HTML version deleted]] > >> > >> ______________________________________________ > >> 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. > >> > > > > ______________________________________________ > > 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. > [[alternative HTML version deleted]] ______________________________________________ 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.