On Aug 20, 2010, at 12:58 PM, Sharpie wrote: > > > Donald Paul Winston wrote: >> >> Aren't you the guy who created Rserve? >> >> I'd like to develop a web app so clients can perform exploratory data >> analysis with their browser with no installed software, not even java (I >> don't like applets). I thought R would be excellent for this but I need >> some issues cleared up before I invest a lot of time working with it. >> > > Well, Simon is the one who create Rserve. However, if you have questions > about Rserve it may be best to start a new thread or at least change the > subject header of your message.
There is now a thread on the stat-rosuda-devel mailing list about that. > This discussion was about creating > stand-alone executables that use R code for deployment on a desktop. > > > Donald Paul Winston wrote: >> >> It appears R insists on directing plot output to a file. Is their a >> graphics device that keeps the output in memory so it can be returned to >> my java app as a stream of bytes? If I have to wait for it to write to a >> "unique file" and then read it back again then I don't think that's going >> to work. My web app needs to support hundreds of concurrent clients. >> > > As far as I know all R graphics output that does not go to a screen device, > such as an X window, must be directed to some sort of file. I am not aware > of a graphics device that provides output to something other than a screen > or a file, but there very well may be such a device in existence. > > The functionality you could describe could be implemented by writing a R > graphics device that forwards the R plotting commands to... well anywhere > you want, really. As the author of an R graphics device, I can say the > trickiest part of such an undertaking will be calculating font metrics so > that R can properly position text in the graphics. Everything else is very > straight-forward. > > I have plans to write a device that forwards the plotting commands to a > socket connection that allows another program to execute them. You may have a look at xGD[1] - it sends all GD commands to a TCP/IP socket (and there is a Java server as an example). Cheers, Simon [1] http://rforge.net/xGD/ > In my case, > an Erlang backbone is used to route the results back to web clients using > websockets. The idea is to have the plot rendered directly in the client's > browser using a JavaScript library like RaphealJS. However, the school year > is upon me and the project will probably remain on the drawing board until > next summer. > > > Donald Paul Winston wrote: >> >> Is REngine.jar and REngineRserve.jar all I need in my web app? >> > > I can't comment on REngine as I have not used it. > > > Donald Paul Winston wrote: >> >> Also, how come their is no shutdown command from the command line for >> Rserve. I see one in the java client api. Do I have to write my own? >> > > I find that on UNIX a SIGTERM, SIGSTOP or SIGKILL signal broadcast using a > command line utility such as kill does the job. > > -Charlie > > ----- > Charlie Sharpsteen > Undergraduate-- Environmental Resources Engineering > Humboldt State University > -- > View this message in context: > http://r.789695.n4.nabble.com/C-or-Java-code-generation-tp2330875p2332761.html > Sent from the R devel mailing list archive at Nabble.com. > > ______________________________________________ > 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
