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

[Rui Barradas]

Hello,

Just use ?cat and ?write.table with append = TRUE. Something like the 
following.

txt <- "ampl.tab 2 1"
dat <- read.table(text = "
A  B
2   3
4   6
2   0
", header = TRUE)

tmp <- "tmp.txt"
cat(txt, "\n", file = tmp) " Don't forget the newline "\n"
write.table(dat, file = tmp, append = TRUE, row.names = FALSE)
#unlink(tmp)  # Clean up


Hope this helps,

Rui Barradas

Em 22-10-2014 01:32, YIHSU CHEN escreveu:
> 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
>
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