Hi Jim actually I did not underscore my code. I just copied and pasted the original code you suggested.
but here is what I have on my system (I tried with csv files if I would get a different result): # setwd("~/Desktop/folder/") system("echo xxx > old.filenames.tab") all.filenames<-list.files(pattern="[.]csv", full.names=TRUE) old.filenames<-read.table("old.filenames.tab") filenames<-all.filenames[!(all.filenames %in% old.filenames)] write.table(all.filenames,file="old.filenames.tab",row.names=FALSE) # > all.filenames [1] "./GMReducedF.csv" "./HLReducedF.csv" "./MinardReducedF.csv" > old.filenames V1 1 xxx # > filenames [1] "./GMReducedF.csv" "./HLReducedF.csv" "./MinardReducedF.csv" ##Now with a few more files in the folder and after running the same code above: > all.filenames [1] "./GMReducedF.csv" "./HLReducedF.csv" "./MinardReducedF.csv" "./Site1ReducedF.csv" "./Site2ReducedF.csv" # > old.filenames V1 1 x 2 ./GMReducedF.csv 3 ./HLReducedF.csv 4 ./MinardReducedF.csv # > filenames [1] "./GMReducedF.csv" "./HLReducedF.csv" "./MinardReducedF.csv" "./Site1ReducedF.csv" "./Site2ReducedF.csv" sessionInfo() R version 2.15.2 (2012-10-26) Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) locale: [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base As you see filenames = all.filenames thank you martin On Mon, Apr 22, 2013 at 4:34 AM, Jim Lemon <j...@bitwrit.com.au> wrote: > On 04/22/2013 10:14 AM, Martin Lavoie wrote: > >> Hi Jim >> >> thanks for the help. I think I understand all the steps you suggested. I >> tried an example with your code but there is something not working I >> think. See below. >> >> all.filenames<-list.files(__**path="pathtofile", full.names=TRUE) /#this >> step works/ >> old.filenames<-read.table("__**old.filenames.tab") /#this step works/ >> filenames<-all.filenames[!(__**all.filenames %in% old.filenames)]/## I >> >> think the problem is here because all.filenames = filenames (also >> checked with str()), so I import all the files (old and new files added >> to my folder) each time I run the code./ >> write.table(all.filenames,__**file="old.filenames.tab",row._** >> _names=FALSE) >> /#this step works/ >> >> Any suggestion? >> > > Hi Martin, > This is what I get on my system: > > > all.filenames<-list.files(**pattern="[.]csv") > > all.filenames > [1] "abc.csv" "codseq.csv" "eyeguess.csv" > [4] "eyeresults.csv" "eyes_data.csv" "fmsdf.csv" > [7] "obsnodecol5.csv" "old.filenames.csv" "Porzio.csv" > [10] "rg_test.csv" "water40.csv" "water_content_40.csv" > # 12 files with a .csv extension > # create a new file with a .csv extension > > system("touch fntest.csv") > # I skipped the writing and reading, but this seems okay for you > > old.filenames<-all.filenames > # now get the new listing with the new file > > all.filenames<-list.files(**pattern="[.]csv") > > all.filenames > [1] "abc.csv" "codseq.csv" "eyeguess.csv" > [4] "eyeresults.csv" "eyes_data.csv" "fmsdf.csv" > [7] "fntest.csv" "obsnodecol5.csv" "old.filenames.csv" > [10] "Porzio.csv" "rg_test.csv" "water40.csv" > [13] "water_content_40.csv" > # now there are 13 files with a .csv extension > > > filenames<-all.filenames[!(**all.filenames %in% old.filenames)] > # only the new file is now in filenames > > filenames > [1] "fntest.csv" > > Are you sure that you want those underscores in your code? I don't think > that "__old.filenames" and "old.filenames" will give you the same file. > > Jim > [[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.