Are you sure it's not available in patched? It's definitely in the source since 6/1.
Michael On Wed, Jun 13, 2018 at 2:19 AM, Martin Maechler <maech...@stat.math.ethz.ch> wrote: >>>>>> Michael Lawrence >>>>>> on Tue, 12 Jun 2018 19:27:49 -0700 writes: > > > Hi Jen, This was already resolved for R 3.5.1 by just > > disabling buffering on terminal file connections like stdin. > > and before R 3.5.1 exists, *and* > as the change is also not yet available in R patched (!) > this means using a version of > "R-devel", e.g. for Windows available from > https://cloud.r-project.org/bin/windows/base/rdevel.html > > Martin > > > Sounds like you might want to be running a web service or > > something instead though. > > > Michael > > > On Tue, Jun 12, 2018 at 4:46 PM, Jennifer Lyon > > <jennifer.s.l...@gmail.com> wrote: > >> Hi: > >> > >> I have also just stumbled into this bug. Unfortunately, I > >> can not change the data my program receives from > >> stdin. My code runs in a larger system and stdin is sent > >> to a Docker container running my R code. The protocol is > >> I read a line, readLines("stdin", n=1), do some actions, > >> send output on stdout, and wait for the next set of data. > >> I don't have control over this protocol, so I can't use > >> the ^D workaround. > >> > >> I am open for other workaround suggestions. The single > >> line is actually JSON and can be quite large. If there > >> isn't something else cleaner, I am going to try > >> readChar() in a while loop looking for \n but I'm > >> guessing that would likely be too slow. I am open to > >> other workaround solutions. For the moment I have > >> reverted back to R 3.4.4. > >> > >> Thanks for any suggestions. > >> > >> Jen. > >> > >> > >>>> >>>>> Martin Maechler >>>>> on Mon, 28 May 2018 > >>>> 10:28:01 +0200 writes: > >>>> > >>>> >>>>> Ralf Stubner >>>>> on Fri, 25 May 2018 19:18:58 > >>>> +0200 writes: > >>>> > >>>> >> Dear all, I would like to draw you attention to this > >>>> >> question on SO: > >>>> >> > >> > https://stackoverflow.com/questions/50372043/readlines-function-with-new-version-of-r > >>>> > >>>> > >>>> >> Based on the OP's code I used the script > >>>> > >>>> >> ####################################### > >>>> >> create_matrix <- function() { >> cat("Write the > >>>> numbers of vertices: ") >> user_input <- > >>>> readLines("stdin", n=1) >> user_input <- > >>>> as.numeric(user_input) >> print(user_input) >> } >> > >>>> create_matrix() > >>>> >> ####################################### > >>>> > >>>> >> and called it with "R -f <filename>" from the > >>>> command line. > >>>> > >>>> >> With 'R version 3.4.4 (2018-03-15) -- "Someone to > >>>> Lean On"' the > >> script > >>>> >> prints the inputed number as expected. With both 'R > >>>> version 3.5.0 >> (2018-04-23) -- "Joy in Playing"' and > >>>> 'R Under development > >> (unstable) > >>>> >> (2018-05-19 r74746) -- "Unsuffered Consequences"' > >>>> the script does > >> not > >>>> >> continue after inputing a number. > >>>> > >>>> > I can confirm. > It "works" if you additionally (the > >>>> [Enter], i.e., EOL) you also > "send" an EOF -- in Unix > >>>> alikes via <Ctrl>-D > >>>> > >>>> > The same happens if you use 'Rscript <filename>' > >>>> > >>>> > I'm not the expert here, but am close to sure that we > >>>> (R core) > did not intend this change, when fixing > >>>> other somewhat subtle > bugs in Rscript / 'R -f' > >>>> > >>>> > Martin Maechler > >>>> > >>>> The same behavior in regular R , no need for a script > >>>> etc. > >>>> > >>>> > str(readLines("stdin", n=1)) > >>>> > >>>> then in addition to the input you need to "give" an EOF > >>>> (Ctrl D) in R > >>> = 3.5.0 > >>>> > >>>> Interestingly, everything works fine if you use stdin() > >>>> instead of "stdin" : > >>>> > >>>> > rr <- readLines(stdin(), n=1) foo > rr [1] "foo" > >>>> > > >>>> ---------- > >>>> > >>>> So, for now use stdin() which is much clearer than the > >>>> string "stdin" anyway > >>>> > >>>> Martin Maechler > >> > >> [[alternative HTML version deleted]] > >> > >> ______________________________________________ > >> R-devel@r-project.org mailing list > >> https://stat.ethz.ch/mailman/listinfo/r-devel > > > ______________________________________________ > > R-devel@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
