Hi All

I want to import several .dat files every day of the week from the same
folder.

Let say, on day 1, I have about 100 files in the folder.

By using this code, everything works perfectly (maybe there is a more
efficient way to do it):

filenames <-list.files(path="pathtofile", full.names=TRUE)
library(plyr)
import.list <- llply(filenames, read.table, header=TRUE, sep="",
na.strings="NA", dec=".", strip.white=TRUE)
#
#MERGE and RESHAPE some of the files have different columns
library(reshape)
data3 <- merge_recurse(import.list)
#
At the end of each day I will export the file as a cvs file in a different
folder.

My question is how can I import on day 2 (day3, day4, etc) the new files in
the folder but without importing the files already imported from the
previous days.

any help would be appreciated
martin

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