[R] add text to the first line of an output file

[Henrik Bengtsson]

You can! Open a file connection and write to that. Whatever write commands
you use will append to the output. Don't forget to close the connection at
the end. See ?file

Henrik
On Oct 22, 2014 12:33 AM, "Sven E. Templer" <sven.templer at gmail.com> wrote:

> Hi.
>
> You can't.
>
> But using a second file where you first write your header and then
> append the original file is a solution. ?cat and ?write.table with a
> focus on the 'append' argument should help. you can then use ?unlink
> to delete the original file and ?file.rename to rename the second, if
> desired.
>
> Best, Sven.
>
> On 22 October 2014 02:32, YIHSU CHEN <yihsuc at gmail.com> wrote:
> > Hi guys;
> >
> > I want to write some text at the first line of an output file.  The
> output
> > file will be used for other software.  In particular, the following text
> > "ampl.tab 2 1" needs to be added to the first line of an  df output file.
> > As a hypothetic example, the output in text file should be like:
> >
> > ampl.tab 2 1
> > A  B
> > 2   3
> > 4   6
> > 2   0
> >
> > Thanks for help.
> >
> > Yihsu
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> 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.
>

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