Dear R community members
I did find a good way to merge my 200 text data files in to a single data file with one column added will show indicator for that file. filelist = list.files(pattern = "K*cd.txt") # the file names are K1cd.txt .................to K200cd.txt data_list <-lapply(filelist, read.table, header=T, comment=";", fill=T) This will create list, but this is not what I want. I want a single dataframe (all separate dataframes have same variable headings) with additional row for example ; just for example, two small datasets are created by my component datasets are huge, need automation ;read from file K1cd.txt var1 var2 var3 var4 1 6 0.3 8 3 4 0.4 9 2 3 0.4 6 1 0.4 0.9 3 ;read from file K2cd.txt var1 var2 var3 var4 1 16 0.6 7 3 14 0.4 6 2 1 3 0.4 5 1 0.6 0.9 2 the output dataframe should look like Fileno var1 var2 var3 var4 1 1 6 0.3 8 1 3 4 0.4 9 1 2 3 0.4 6 1 1 0.4 0.9 3 2 1 16 0.6 7 2 3 14 0.4 6 2 2 1 3 0.4 5 2 1 0.6 0.9 2 Please note that new file no column is added Thank you for the help. Umesh R [[alternative HTML version deleted]] ______________________________________________ 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.