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.