RStudio uses a non-interactive R session to compile R Markdown documents, which means the functions that involve human interaction will not work. The only way to make these functions work is to use an interactive R session, which basically means you should not click the button in RStudio to compile the documents, but should type rmarkdown::render() in the R console instead. You cannot put the numbers under scan() and expect they will be read by scan() as if they were typed by a human, even though they look similar.
If the function in your case only allows file input for scan(), I guess the only way is to make a connection, such as textConnection() as you mentioned. Regards, Yihui -- Yihui Xie <xieyi...@gmail.com> Web: http://yihui.name On Sat, Oct 25, 2014 at 10:58 AM, John Fox <j...@mcmaster.ca> wrote: > Dear Peter, > > Thanks for the suggestion -- it's a bit better for the example I provided > than my approach of using textConnection() of putting the lines in a file. > > I'd still be interested in whether I've missed something like a text-chunk > option that would allow the R Markdown document to behave like a script > executed at the console. For example, your approach doesn't work for the > application where I encountered the problem, which is in a function that > calls scan() and that passes the file argument to it, but doesn't use the > text argument. > > Best, > John > > On Sat, 25 Oct 2014 17:11:14 +0200 > peter dalgaard <pda...@gmail.com> wrote: >> >> > On 25 Oct 2014, at 16:43 , John Fox <j...@mcmaster.ca> wrote: >> > >> > Dear JJ and list members, >> > >> > I wonder whether it's possible to get scan() to read in-line data in an R >> > Markdown document. The following code, for example, works (of course) when >> > entered in the R console but fails in an R block in an R Markdown document >> > (using an up-to-date version of RStudio): >> > >> > ```{r} >> > x <- scan() >> > 1 2 3 >> > 4 5 6 >> > >> > x >> > ```` >> > >> > I'm aware of a couple of work-arounds, such as putting the data in a file >> > or a character string (as below), but am interested in whether it's >> > possible to get this to work directly. >> > >> > ```{r} >> > text <- " >> > 1 2 3 >> > 4 5 6 >> > " >> > (x <- scan(file=textConnection(text))) >> > ```` >> > >> > Any help would be appreciated. >> >> This generally isn't easy. You can't source() a file like that either, it >> only works on std.input, and even there it is tricky it you have tabs in the >> (pasted) data. Notice that >> >> scan(text=" >> 1 2 3 >> 4 5 6 >> ") >> >> was designed for the purpose of reading inline data. >> >> >> -- >> Peter Dalgaard, Professor, >> Center for Statistics, Copenhagen Business School >> Solbjerg Plads 3, 2000 Frederiksberg, Denmark >> Phone: (+45)38153501 >> Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ 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.
