loop in R language with variable in address

Question

I have several txt files, and their names are 1.txt, 2.txt,3.txt and … 100.txt

I want to read these files in R language in loop. My code is:

For(I in 1:100){

    Datai<-read.table(“H://”+’i’+”.txt”)

}

But when I run I get this error:

non-numeric argument to binary operator

How can I solve this problem?

score 2 · Accepted Answer · edited May 23 '17 at 10:32

2

For(I in 1:100){

Datai<-read.table(paste(paste("H://",i,".txt",sep="")))

}

As far as I know there is no string concatenate operator in R.

Here is a question how to construct one.

edited May 23 '17 at 10:32

Community

1
1

answered Feb 13 '13 at 10:11

Trudbert

3,178
14
14

A single paste should do also the trick `paste("H://",i,".txt",sep="")` – Daniel Fischer Feb 13 '13 at 10:13

score 1 · Answer 2 · answered Feb 13 '13 at 10:27

In your loop the object Datai is replaced by the new object in each run. You should store the data frames returned by read.table in a list instead.

Data <- vector("list", length = 100) # initialize the list
For(I in 1:100){    
    Data[[I]] <- read.table(paste("H://", I, ".txt", sep = ""))    
}

The same could be achieved with lapply:

Data <- lapply(1:100, function(I) read.table(paste("H://", I, ".txt", sep = "")))

loop in R language with variable in address

2 Answers2