"Jan T. Kim" <[EMAIL PROTECTED]> writes: > > Well, that is probably reasonably easy, but (not the least due to that > > fact) I'm still surprised that it has not been done already. I can hardly > > imagine that I'm the first one to want to use some external utility from > > an R program in this way. > > > > So, what do you R-devel folks do in this case, and what would you > > recommend? > > I'm still curious about this one. If there really is no way of running > stuff through external filter processes in R, I'd volunteer to add > that. > > Best regards & thanks in advance, Jan
If you know how, please do. I have a suspicion it might not be as easy as it sounds because of the producer/consumer aspects. Notice, though, that in most cases you can get by with system() or pipe() and a temporary file for either the input or the output. I remember speculating about these matters when I was first introduced to pipes in C: They'd show you how to open a pipe for reading and how to do it for writing, but not how to do both with the same process. Took me a while to realize that there is a nontrivial deadlock issue if you try to write to a process that itself is blocked trying to write its output. Now that is of course not to say that it cannot be done with clever multiplexing and buffering techniques -- or multithreading, except that R isn't threaded. BTW, we met in Heidelberg at the ECMBM ages ago, didn't we? -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-devel@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
