Alright, if it is the case that the "output file" already exists, then yes Sven's suggestion is more or less the only solution.
Henrik On Oct 22, 2014 2:08 AM, "Sven E. Templer" <sven.temp...@gmail.com> wrote: > He wants to prepend, not append. > > On 22 October 2014 11:04, Henrik Bengtsson <h...@biostat.ucsf.edu> wrote: > > 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.temp...@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 <yih...@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]] > >> > > >> > ______________________________________________ > >> > 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 > >> > and provide commented, minimal, self-contained, reproducible code. > >> > >> ______________________________________________ > >> 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 > >> and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.
