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.
