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
______________________________________________
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.
