'For each file in folder F do....'
On 11/27/2005 3:51 PM, Ron Piccinini wrote:
Hello,
I have 2700 text files in a folder and need to apply
the same program/procedure to each individually. I'm
trying to find how to code something like:
For each file in <Folder> do {<Procedure>}
is there an easy way to do this? other suggestions?
I have tried to list all the files names in a vector
e.g.
listfiles[1:10,1]
1 H:/Rtest/AXP.txt 2 H:/Rtest/BA.txt 3 H:/Rtest/C.txt 4 H:/Rtest/CAT.txt 5 H:/Rtest/DD.txt 6 H:/Rtest/DIS.txt 7 H:/Rtest/EK.txt 8 H:/Rtest/GE.txt 9 H:/Rtest/GM.txt 10 H:/Rtest/HD.txt but R doesn't like statements of type
read.table(file=listfiles[1,1])
since 'file' must be a character string or connection... Any thoughts?
From the look of it, the listfiles column that you created has been converted to a factor. You can convert back to character using as.character(); the as.is=TRUE parameter in the file reading functions will prevent the conversion in the first place, if that's how it happened. Then something like results <- list() for (f in as.character(listfiles[,1])) results[[f]] <- read.table(file=f) will read all the files and put them in a list. Duncan Murdoch