[R] loop and read.table

[Uwe Ligges]

lefebure tristan wrote:
> Hi,
> I would like to open several tables with a loop, using something like :
> -----------------
> $ ls
> 1.txt		2.txt		3.txt		4.txt
> $ R
> 
>>for (i in 1:4)  tabi<-read.table("i.txt")

Since i is within a character string, it cannot be used as a variable in 
your case. You may paste() is together: paste(i, ".txt", sep=""), or 
even better, read the directories contents with list.files() and proceed 
over the result as in:

  tab <- lapply(list.files(pattern="^?[[:digit:]]\.txt"), read.table)

Uwe Ligges

> Error in file(file, "r") : unable to open connection
> In addition: Warning message:
> cannot open file `i.txt'
> ------------------
> 
> thanks for any help
> 
> Tristan Lefebure
> 
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