You also might take a look at using file.append to speed up the process.

On Thu, Apr 15, 2010 at 10:34 AM, Zev Ross <zev@zevross.com> wrote:

> All,
>
> I have a 30 million record text file without header information. I would
> like to add a header to this file without reading it first. Is this
> possible? The code below does what I want except that the readLines portion
> takes quite a long time. Is there a way around reading the lines? I'm
> working on Windows XP.
>
> Zev
>
> input<-readLines("c:/junk/forR.csv")
> input<-c(c('"a", "b", "c", "d", "e", "f"'), input)
> writeLines(input, "c:/junk/forRfix.csv")
>
> --
> Zev Ross
> ZevRoss Spatial Analysis
> 120 N Aurora, Suite 3A
> Ithaca, NY 14850
> 607-277-0004 (phone)
> 866-877-3690 (fax, toll-free)
> zev@zevross.com
>
> ______________________________________________
> R-help@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<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>



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

What is the problem that you are trying to solve?

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