On 09.03.2011 23:56, Johann Kim wrote:
Hello everyone,
I want to use a loop to load many files, each into a seperate variable
(data.frames) and then
- still in the loop - manipulate the present variable/data.frame.
So far this works:
for (i in 1:2){
var<- paste("var",i,sep="")
fileName<- paste(i,"rating.txt", sep="_")
assign(var, read.table(fileName))
But how can I now referr to var / var[i] to manipulate that data.frame?
For example: var<- var[ , -1]
} # end of the for loop
I'd suggest to generate a list of data.frames rather assigning them to
objects of different names:
var <- vector(mode = "list", length = 2)
for (i in 1:2){
fileName<- paste(i, "rating.txt", sep = "_")
var[[i]] <- read.table(fileName)
var[[i]] <- var[[i]][ , -1]
}
or maybe nicer for all files ending in "rating.txt":
files <- dir(pattern = "rating\\.txt$")
var <- vector(mode = "list", length = length(files))
for (i in seq_along(files)){
var[[i]] <- read.table(files[i])
var[[i]] <- var[[i]][ , -1]
}
Uwe Ligges
Many thanks for help!
Johann
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