Re: [R] Creating images without X11
Is it possible the problem is another? I cannot generate png images when R runs on a machine without *installed* X11 Here is the error message when I submit a simple png() plot on a computing node of my cluster. Error in X11(paste(png::, filename, sep = ), width, height, pointsize, : unable to start device PNG Calls: png In addition: Warning message: In png(Test.png) : unable to open connection to X11 display '' Execution halted The solution for my problem is to generate pdf files (that are then included in a LaTeX paper, so the solution does not help you). Ciao! mario On 14-Mar-10 6:14, Sharpie wrote: Jillian E Kozyra wrote: Dear Colleagues, We are attempting to create trees using R with our Ruby on Rails application. However, we are running into a problem involving the creation of the graphic. We would like them to be in either jpg or png format so that users can save, but due to a lack of control over our sever we are unable to start X11 server. Is there a way to create these images without using X11 server? Thanks, JIllian I had this exact same problem last summer when attempting to set up an automated process involving image generation on a remote server. Since I didn't have admin rights to the server, I ended up switching to the Cairo package for image generation as it uses the Cairo library rather than X11 as the back end. The other solution involved setting some sort of obscure, arcane X11 permission that I can't recall right now. All I can recall is that finding it was a frustrating half-day of Google searching and digging through man pages. I would suggest Cairo. Hope this helps! -Charlie - Charlie Sharpsteen Undergraduate-- Environmental Resources Engineering Humboldt State University -- Ing. Mario Valle Data Analysis and Visualization Group| http://www.cscs.ch/~mvalle Swiss National Supercomputing Centre (CSCS) | Tel: +41 (91) 610.82.60 v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82 __ 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.
Re: [R] Creating images without X11
On Sun, Mar 14, 2010 at 5:14 AM, Sharpie ch...@sharpsteen.net wrote: I had this exact same problem last summer when attempting to set up an automated process involving image generation on a remote server. Since I didn't have admin rights to the server, I ended up switching to the Cairo package for image generation as it uses the Cairo library rather than X11 as the back end. The other solution involved setting some sort of obscure, arcane X11 permission that I can't recall right now. All I can recall is that finding it was a frustrating half-day of Google searching and digging through man pages. It should be that 'cairo' is the default type for png (and other bitmap) generation: getOption(bitmapType) [1] cairo The png() function has an option for 'type='. If you use type=cairo (which is got from getOption, should be default) then an X server isn't needed. If you try type=X11 then one is. Apple fanboys can try type=quartz. Again, this is all convoluted with what was compiled into R, and what does capabilities() etc tell us. No word back from the original poster yet - Jillian Kozyra, are we helping??? Barry __ 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.
Re: [R] Creating images without X11
library(GDD) Or install Xvfb on your server From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] On Behalf Of Jillian E Kozyra [jill...@gmail.com] Sent: 13 March 2010 16:27 To: r-help@r-project.org Subject: [R] Creating images without X11 Dear Colleagues, We are attempting to create trees using R with our Ruby on Rails application. However, we are running into a problem involving the creation of the graphic. We would like them to be in either jpg or png format so that users can save, but due to a lack of control over our sever we are unable to start X11 server. Is there a way to create these images without using X11 server? Thanks, JIllian -- 917-434-7511 http://www.jilliankozyra.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. __ 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.
Re: [R] Creating images without X11
On 13-Mar-10 16:27:05, Jillian E Kozyra wrote: Dear Colleagues, We are attempting to create trees using R with our Ruby on Rails application. However, we are running into a problem involving the creation of the graphic. We would like them to be in either jpg or png format so that users can save, but due to a lack of control over our sever we are unable to start X11 server. Is there a way to create these images without using X11 server? Thanks, JIllian -- 917-434-7511 http://www.jilliankozyra.com Provided you trust your code to produce correctly the graphic you want (i.e. you do not need to inspect the graphic on-screen to verify that it is correct), then there should be no problem. As a test, I just switched (Ctrl-Alt-F1) to a text console in Linux, and then executed R --no-save png(MyPNG.png) plot(rnorm(10),rnorm(10)) dev.off() Then I killed R, switched back (Ctrl-Alt-F7) to the graphical desktop, and then found the file MyPNG.png safe and well which, when displayed, was just what it should be. Summary: So long as you do not try to plot graphics to screen, and use the png() or jpg() device (as above), then the graphic will be written to file without needing X11. However, you will not, of course, be able to see them on screen. If you just did the plot() command without encapsulating it in a device to write files as above, then nothing would happen. It is possible to convert a graphics file into ASCII Art, and then you could see a (very) coarse approximation to your graphic on-screen in a console terminal. However, I'm not going to make any recommendations on how to do that! Ted. E-Mail: (Ted Harding) ted.hard...@manchester.ac.uk Fax-to-email: +44 (0)870 094 0861 Date: 13-Mar-10 Time: 22:16:16 -- XFMail -- __ 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.
Re: [R] Creating images without X11
On Sat, Mar 13, 2010 at 4:27 PM, Jillian E Kozyra jill...@gmail.com wrote: Dear Colleagues, We are attempting to create trees using R with our Ruby on Rails application. However, we are running into a problem involving the creation of the graphic. We would like them to be in either jpg or png format so that users can save, but due to a lack of control over our sever we are unable to start X11 server. Is there a way to create these images without using X11 server? Not sure what version of R you are using, but the png() device hasn't needed an X11 server since way back when. Watch: $ export -n DISPLAY $ R png() plot(1:10) dev.off() q() then I have a very fine Rplot001.png file. Now it may be that you can't compile PNG support without X11 being there at compile time, but if you can compile R on a workstation with X11 support then that R should work find on your server to produce pngs even without X11 support there and then. jpeg() device works the same - X11 not needed at runtime. What makes you think it's lack of X11 that is making png or jpeg devices fail? Run the capabilities() function and see if your R has png and jpeg support - my suspicion is that you've compiled it on the server with no X11 headers. It doesn't need a server at runtime. Barry __ 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.
Re: [R] Creating images without X11
On 13-Mar-10 22:17:26, Barry Rowlingson wrote: On Sat, Mar 13, 2010 at 4:27 PM, Jillian E Kozyra jill...@gmail.com wrote: Dear Colleagues, We are attempting to create trees using R with our Ruby on Rails application. However, we are running into a problem involving the creation of the graphic. We would like them to be in either jpg or png format so that users can save, but due to a lack of control over our sever we are unable to start X11 server. Is there a way to create these images without using X11 server? Not sure what version of R you are using, but the png() device hasn't needed an X11 server since way back when. Watch: $ export -n DISPLAY $ R png() plot(1:10) dev.off() q() then I have a very fine Rplot001.png file. Now it may be that you can't compile PNG support without X11 being there at compile time, but if you can compile R on a workstation with X11 support then that R should work find on your server to produce pngs even without X11 support there and then. jpeg() device works the same - X11 not needed at runtime. What makes you think it's lack of X11 that is making png or jpeg devices fail? Run the capabilities() function and see if your R has png and jpeg support - my suspicion is that you've compiled it on the server with no X11 headers. It doesn't need a server at runtime. Barry [Not for the first time, we've made almost identical comments almost simultaneously, Baz] A further thought: Jillian, I was assuming from your first post that you were unable to start X11 on the machine you were sitting at, the server being remote. If you *can* start X11 on the machine you are sitting at (or if it boots up into a graphics display with X11 already running) then you do not need to have X11 running on the remote server, so long as it has X11 *installed* (so that the programs which need an X display are there). It's a reversal of the usual view of things. If your machine is running X, then it is *your* machine which is the *X-server*, and programs running on the remote server which generate X11 output are the *X-clients*, sending X-requests to your machine. The one thing you may need to do on the machine you are sitting at is xhost + to allow access to your local X-server by remote machines which are generating X output. In short -- I'm not sure in my mind about the situation you find yourself in. How does it come about that you are unable to start X11 server? Ted. E-Mail: (Ted Harding) ted.hard...@manchester.ac.uk Fax-to-email: +44 (0)870 094 0861 Date: 13-Mar-10 Time: 22:36:15 -- XFMail -- __ 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.
Re: [R] Creating images without X11
Jillian E Kozyra wrote: Dear Colleagues, We are attempting to create trees using R with our Ruby on Rails application. However, we are running into a problem involving the creation of the graphic. We would like them to be in either jpg or png format so that users can save, but due to a lack of control over our sever we are unable to start X11 server. Is there a way to create these images without using X11 server? Thanks, JIllian I had this exact same problem last summer when attempting to set up an automated process involving image generation on a remote server. Since I didn't have admin rights to the server, I ended up switching to the Cairo package for image generation as it uses the Cairo library rather than X11 as the back end. The other solution involved setting some sort of obscure, arcane X11 permission that I can't recall right now. All I can recall is that finding it was a frustrating half-day of Google searching and digging through man pages. I would suggest Cairo. Hope this helps! -Charlie - Charlie Sharpsteen Undergraduate-- Environmental Resources Engineering Humboldt State University -- View this message in context: http://n4.nabble.com/Creating-images-without-X11-tp1592016p1592201.html Sent from the R help mailing list archive at Nabble.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.
