As you have noticed, using assign is not simple, and your approach has
potential to cause even more problems even if you get it working.
Here is another approach:
loadCSVfiles <- function(path) {
x <- list.files(path, full.names=TRUE)
out <- lapply( x, read.csv )
names(out) <- sub(pattern="\\.csv$", replacement="", x)
out
}
then run:
mydata <- loadCSVfiles("/my/path")
and mydata will be a list with all of your data objects with the
desired names. You can do things like:
plot(mydata$alaska)
or
with(mydata, plot(alaska))
or
lapply( mydata, plot )
etc.
This approach does not place the individual objects into the global
workspace, but that is a good thing.
On Wed, Nov 27, 2013 at 3:39 PM, yetik serbest <yserb...@prodigy.net> wrote:
> Hi Everyone,
>
> I am trying to import many CSV files to their own matrices. Example,
> alaska_93.csv to alaska. When I execute the following, for each csv.file
> separately it is successful.
>
> singleCSVFile2Matrix <- function(x,path) {
> assign(gsub(pattern=".csv",x,replacement=""),read.csv(paste(path,x,sep="")))
> }
>
> when I try to include it in a loop in another function (I have so many csv
> files to import), it doesn't work. I mean the following function doesn't do
> it.
>
> loadCSVFiles_old <- function(path) {
> x <- list.files(path)
> for (i in 1:length(x)) {
>
> assign(gsub(pattern=".csv",x[i],replacement=""),read.csv(paste(path,x[i],sep="")))
> }
> }
>
> Instead, if I execute the foor loop in the command line, it works. I am
> puzzled. Appreciate any help.
>
> thanks
> yetik
>
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> and provide commented, minimal, self-contained, reproducible code.
--
Gregory (Greg) L. Snow Ph.D.
538...@gmail.com
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