R help - Jul 2009 - How can I test for End-Of-FIle

I have a long text file with uneven record length and variable structure.
Therefore I have to read it line-by-line.
I found out I can open a connection to the file and read in one line at a time.
Something like:

 con <- file("MyFle.txt","r")
 while (End-Of-File) {
   line <-  readLines(con,n=1)
   ParseLine(line)
 }

But I realized I do not know how to test for the End-Of-File condition using R
language.
I found a ghost documentation page mentioning an R built-in function
"isEof(connection)".
But such a function is not listed in R  "utils" package it seems to
belong to.

I would appreciate any comment and/or suggestion.
Thank you in advance.
Maura
 





tutti i telefonini TIM!


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You can do something like this:

con <- file("MyFle.txt","r")
 repeat {
  line <-  readLines(con,n=1)
  if (length(line) == 0) break
  ParseLine(line)
 }

On Sun, Jul 12, 2009 at 6:20 PM, <mauede at alice.it>
wrote:
> I have a long text file with uneven record length and variable structure.
> Therefore I have to read it line-by-line.
> I found out I can open a connection to the file and read in one line at a
time.
> Something like:
>
> ?con <- file("MyFle.txt","r")
> ?while (End-Of-File) {
> ? line <- ?readLines(con,n=1)
> ? ParseLine(line)
> ?}
>
> But I realized I do not know how to test for the End-Of-File condition
using R language.
> I found a ghost documentation page mentioning an R built-in function
"isEof(connection)".
> But such a function is not listed in R ?"utils" package it seems
to belong to.
>
> I would appreciate any comment and/or suggestion.
> Thank you in advance.
> Maura
>
>
>
>
>
>
> tutti i telefonini TIM!
>
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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