[R] R File I/O Capability - Writing output to specific lines of existing file

[Jason Rupert]

Darn.

I was afraid of this.  Always kind of weak when it comes to file I/O approaches, so I guess I will have to stretch and try to put something together.   

Yeah.  The input flat text file is about 600 lines long.  I will be replacing about 200.  I already have the template for those 200 lines.  I guess I will just need to read down to line 400 and replace until line 600.  

Thanks again for all the insights regarding this. 



--- On Wed, 4/8/09, jim holtman <jholtman at gmail.com> wrote:

> From: jim holtman <jholtman at gmail.com>
> Subject: Re: [R] R File I/O Capability - Writing output to specific lines of  existing file
> To: jasonkrupert at yahoo.com
> Cc: R-help at r-project.org
> Date: Wednesday, April 8, 2009, 8:02 PM
> You can always read in the initialization file, make the
> updates to it
> and then write it back out.  If it is a text file, it would
> be very
> hard to write into the middle of it since there is no
> structure to the
> file.  You can read it in as a table (read.table) or just
> as lines
> (readLines) and the make any changes you want.  You can use
> regular
> expressions if you want to put something in the middle of
> one of the
> lines you have read in.
> 
> On Wed, Apr 8, 2009 at 10:13 AM, Jason Rupert
> <jasonkrupert at yahoo.com> wrote:
> >
> > Currently I am using the R "write" command
> to output results to a *.txt file and then copying those
> results into an initialization file.  In an attempt to
> continue to automate the process I would like to have R
> write to the location in the existing initialization file,
> instead of me copying the data over.
> >
> > By any chance are there any R commands to help?
> >
> > Primarily, I will be using Windows, and the
> initialization file is a simple flat file, i.e. not XML or
> binary.
> >
> > I looked at:
> > (a)
> http://www.stat.ucl.ac.be/ISdidactique/Rhelp/library/R.io/html/00Index.html
> >
> > (b)
> http://search.r-project.org/cgi-bin/namazu.cgi?query=File+I%2FO&max=100&result=normal&sort=score&idxname=functions&idxname=Rhelp08
> >
> > But, this did not appear to provide the functionality
> to edit an existing file by adding information to the middle
> of the file.
> >
> > Thank you again for any help and insight.
> >
> > ______________________________________________
> > 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
> 
> What is the problem that you are trying to solve?