On Nov 27, 2013, at 2:39 PM, yetik serbest 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="")))
> }
> }
It appears you are not returning the values that you created inside that
function to the global environment. I would have expected that you would either
given `assign` an environment argument or that you would have created a list of
items to return from the function.
?environment
?assign
Perhaps:
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="")))
envir=.GlobalEnv
}
}
>
> 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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David Winsemius
Alameda, CA, USA
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