Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Monday 14 July 2008 21:22:31 you wrote: I would think that the gtk mainloop would terminate when the window closes (which termination should propagate back up the stack), but apparently that doesn't happen. I'm not sure I'm following you at the moment. Are you calling show() once and closing the figure doesn't cause it to return? or are you trying to call show() multiple times from a single script and subsequent calls to show() fail to return? Hi, Ryan, Thanks for your continued help. I am calling show() once, and closing the figure doesn't cause it to return? I've verified the lack of return using debug sys.stderr.write() statements, as well as by following show() with a sys.exit() command. (Getting this back on the full list...) This sounds like a bug to me, specific to your set up. I just ran a script (for my own sanity) and closing the figure, resulted in the script exiting and returning to the command prompt. Do you happen to have a small complete example that replicates your problems that you could post here? Also, what are your versions of matplotlib and PyGtk (you are using GtkAgg, right)? Also, what OS are you running? Devs, what do you think? Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma Thanks, Ryan, The requested info is below. Thanks again. James - - SMALL COMPLETE EXAMPLE CODE FOLLOWS - #!/usr/bin/python # File: test.py import os,sys import pylab as PL import numpy as N def main(): fig = PL.figure(1) x = N.arange(120.0)*2*N.pi/120.0 x = PL.resize(x, (100,120)) y = N.arange(100.0)*2*N.pi/100.0 y = N.resize(y, (120,100)) y = N.transpose(y) z = N.sin(x) + N.cos(y) PL.imshow( z , cmap=PL.cm.jet)#, interpolation='nearest') sys.stderr.write(Begun.) PL.show() sys.stderr.write(Done.) sys.exit(0) if __name__ == __main__: - END OF SAMPLE CODE --- Sample output: - --- BEGIN -- $ ./test.py Begun. - --- COMMENTS: -- The image displays. I click on the X; the image disappears. Nothing happens in the terminal output. In the terminal window I type ctrlC. - --- BEGIN -- ^CTraceback (most recent call last): File ./test.py, line 59, in module main() File ./test.py, line 25, in main PL.show() File /usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py, line 71, in show gtk.main() KeyboardInterrupt $ - -- END OF OUTPUT CODE -- The same behavior occurs when run from within an interactive session. python version: 2.5.1 (4251:54863, Jun 15 2008, 23:59:20) Matplotlib version: 0.91.2 PyGTK version: 2.12.0-2.fc8 In ~/.matplotlib/matplotlibrc: backend : GTKAgg OS: Fedora 8 Linux kernel: 2.6.25.6-27.fc8 -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) iD8DBQFIfKh4xOXthSHeGJIRAvbzAKCF9U7EJ4oM2JyQjKokOBZAv6PSlwCfZV3t I5jSycQj8dAqI0QGkewAw3o= =vdPu -END PGP SIGNATURE- - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
On Tue, Jul 15, 2008 at 8:39 AM, James K. Gruetzner [EMAIL PROTECTED] wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Monday 14 July 2008 21:22:31 you wrote: I would think that the gtk mainloop would terminate when the window closes (which termination should propagate back up the stack), but apparently that doesn't happen. I'm not sure I'm following you at the moment. Are you calling show() once and closing the figure doesn't cause it to return? or are you trying to call show() multiple times from a single script and subsequent calls to show() fail to return? Hi, Ryan, Thanks for your continued help. I am calling show() once, and closing the figure doesn't cause it to return? I've verified the lack of return using debug sys.stderr.write() statements, as well as by following show() with a sys.exit() command. (Getting this back on the full list...) This sounds like a bug to me, specific to your set up. I just ran a script (for my own sanity) and closing the figure, resulted in the script exiting and returning to the command prompt. Do you happen to have a small complete example that replicates your problems that you could post here? Also, what are your versions of matplotlib and PyGtk (you are using GtkAgg, right)? Also, what OS are you running? Devs, what do you think? Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma Thanks, Ryan, The requested info is below. Thanks again. I am not seeing any problems on the 91 branch or the 98 trunk. Below is my command and output (the shell returns when I close the window with a click) [EMAIL PROTECTED]:svn python ~/test.py --verbose-helpful -dGTKAgg $HOME=/home/titan/johnh CONFIGDIR=/home/titan/johnh/.matplotlib matplotlib data path /home/titan/johnh/dev/lib/python2.4/site-packages/matplotlib/mpl-data loaded rc file /home/titan/johnh/.matplotlib/matplotlibrc matplotlib version 0.91.4 verbose.level helpful interactive is False units is False platform is sunos5 numerix numpy 1.2.0.dev5410 Using fontManager instance from /home/titan/johnh/.matplotlib/fontManager.cache backend GTKAgg version 2.6.0 [EMAIL PROTECTED]:svn - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Tuesday 15 July 2008 07:48:45 John Hunter wrote: On Tue, Jul 15, 2008 at 8:39 AM, James K. Gruetzner [EMAIL PROTECTED] wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Monday 14 July 2008 21:22:31 you wrote: I would think that the gtk mainloop would terminate when the window closes (which termination should propagate back up the stack), but apparently that doesn't happen. I'm not sure I'm following you at the moment. Are you calling show() once and closing the figure doesn't cause it to return? or are you trying to call show() multiple times from a single script and subsequent calls to show() fail to return? Hi, Ryan, Thanks for your continued help. I am calling show() once, and closing the figure doesn't cause it to return? I've verified the lack of return using debug sys.stderr.write() statements, as well as by following show() with a sys.exit() command. (Getting this back on the full list...) This sounds like a bug to me, specific to your set up. I just ran a script (for my own sanity) and closing the figure, resulted in the script exiting and returning to the command prompt. Do you happen to have a small complete example that replicates your problems that you could post here? Also, what are your versions of matplotlib and PyGtk (you are using GtkAgg, right)? Also, what OS are you running? Devs, what do you think? Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma Thanks, Ryan, The requested info is below. Thanks again. I am not seeing any problems on the 91 branch or the 98 trunk. Below is my command and output (the shell returns when I close the window with a click) [EMAIL PROTECTED]:svn python ~/test.py --verbose-helpful -dGTKAgg $HOME=/home/titan/johnh CONFIGDIR=/home/titan/johnh/.matplotlib matplotlib data path /home/titan/johnh/dev/lib/python2.4/site-packages/matplotlib/mpl-data loaded rc file /home/titan/johnh/.matplotlib/matplotlibrc matplotlib version 0.91.4 verbose.level helpful interactive is False units is False platform is sunos5 numerix numpy 1.2.0.dev5410 Using fontManager instance from /home/titan/johnh/.matplotlib/fontManager.cache backend GTKAgg version 2.6.0 [EMAIL PROTECTED]:svn Hi, John, Here's my equivalent: $ python ./test.py --verbose-helpful -dGTKAgg $HOME=/home/jkgruet CONFIGDIR=/home/jkgruet/.matplotlib matplotlib data path /usr/lib/python2.5/site-packages/matplotlib/mpl-data loaded rc file /home/jkgruet/.matplotlib/matplotlibrc matplotlib version 0.91.2 verbose.level helpful interactive is True units is False platform is linux2 numerix numpy 1.1.0 Using fontManager instance from /home/jkgruet/.matplotlib/fontManager.cache backend GTKAgg version 2.12.0 Begun. . . . at which point it hangs, even after the window is closed. I see that I have a older matplotlib and numpy versions. Those are the same versions as in Fedora 9, so upgrading there won't help. OTOH, my GTKAgg version is 2.12,0, not 2.6.0. I'm fairly sure that is where the problem lies, or, more likely, in GTK itself, where I have installed: gtk+.i3861:1.2.10-59.fc8 gtk2.i3862.12.8-2.fc8 This is verified by testing several backends: GTKAgg: fails to return when X is clicked GTK: fails to return when X is clicked GTKCairo: fails to return when X is clicked WxAgg:displays and returns immediately (no need to click any X !!! ) QtAgg:returns when X is clicked; TkAgg:returns when X is clicked; FltkAgg: ImportError: No module named fltk, although fltk is installed WX: NotImplementedError from .../matplotlib/image.py in draw: renderer.draw_Image(...) So . . . for my purposes, I think I'll just use QtAgg or TkAgg. I'm not sure how I would file a bug report against GTK, however, or even *if* I should file one given my utter ignorance of gtk. I appreciate all the help shown on the list. Y'all're very kind. James -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) iD8DBQFIfMa9xOXthSHeGJIRApqIAKDi1q+EA7feFvhyhWWlhyUvU0GpugCg3Kx3 +mqZBXBgGVUgtP3Fwr4+POg= =qkT7 -END PGP SIGNATURE- - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
On Tue, Jul 15, 2008 at 10:48 AM, James K. Gruetzner [EMAIL PROTECTED] wrote: OTOH, my GTKAgg version is 2.12,0, not 2.6.0. I'm fairly sure that is where the problem lies, or, more likely, in GTK itself, where I have installed: I just tested on gtk 2.12.0 and did not see the problem with mpl 0.98 and backend gtkagg. Not sure why you are having these problems... JDH - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
I would think that the gtk mainloop would terminate when the window closes (which termination should propagate back up the stack), but apparently that doesn't happen. I'm not sure I'm following you at the moment. Are you calling show() once and closing the figure doesn't cause it to return? or are you trying to call show() multiple times from a single script and subsequent calls to show() fail to return? Hi, Ryan, Thanks for your continued help. I am calling show() once, and closing the figure doesn't cause it to return? I've verified the lack of return using debug sys.stderr.write() statements, as well as by following show() with a sys.exit() command. (Getting this back on the full list...) This sounds like a bug to me, specific to your set up. I just ran a script (for my own sanity) and closing the figure, resulted in the script exiting and returning to the command prompt. Do you happen to have a small complete example that replicates your problems that you could post here? Also, what are your versions of matplotlib and PyGtk (you are using GtkAgg, right)? Also, what OS are you running? Devs, what do you think? Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
James K. Gruetzner wrote: I don't really need any live interaction or a live data display; I just want the thang to stop running (i.e., the process to terminate) when the figure window is closed. Unfortunately, the dynamic_image_gtkagg.py example has the same problem. It's final line is show(). When run as a background process, everything displays well --- but when the window is closed (click on X), the process fails to terminate. So . . . the root cause is that show() does not return when the shown image is closed. If you *need* it to wait for user interaction before continuing, there might be a little bit more work, but I don't think it'd be much. You could probably instead look at some of the Matplotlib UI widgets, like in the buttons.py example. I really don't need user interaction per se, I may have to go that route an establish some sort of close window and exit event. Hmmm: another learning opportunity . . . . :-) The show() function is defined in .../matplotlib/backends/backend_gtk.py and looks to be calling gtk.main(), which, according to .../gtk-2.0/gtk/__init__.py appears to be deprecated in favor of mainloop(). And that's as far as I can go in this: I'm not graphics whiz, and, in fact, having reached somewhat beyond my skill level, can't even figure out how to trace the mainloop call back further. I would think that the gtk mainloop would terminate when the window closes (which termination should propagate back up the stack), but apparently that doesn't happen. I'm not sure I'm following you at the moment. Are you calling show() once and closing the figure doesn't cause it to return? or are you trying to call show() multiple times from a single script and subsequent calls to show() fail to return? Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
On Fri, Jul 11, 2008 at 11:55 AM, James K. Gruetzner [EMAIL PROTECTED] wrote: And that's as far as I can go in this: I'm not graphics whiz, and, in fact, having reached somewhat beyond my skill level, can't even figure out how to trace the mainloop call back further. To make sure I capture all the events that can close the window, I usually connect to the delete-event and the destroy-event. Eg:: win.connect(delete_event, gtk.mainquit) win.connect(destroy_event, gtk.mainquit) where win is your gtk window. JDH - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Thursday 10 July 2008 18:50:12 you wrote: James K. Gruetzner wrote: I'm running Fedora 8, python 2.5.1, and matplotlib 0.91.2-1.fc8 from the yum repository. Backend is set to GTKAgg in my matplotlibrc file. (On this list top-posting is frowned upon -- it makes the conversation difficult to follow.) I understand. Sorry. Each list is different: I'm new here, and will try remember. No problem. Also, don't forget reply-to-all, so that the whole of the list can chime in here. :) Arrrgh Almost all my other lists have that as default, so I'm out of the habit of checking. Your analysis is correct, the call to show() activates the GUI mainloop and does not return until the window is closed. Within ipython there is some magic that occurs that runs the mainloop in a separate thread. What do you need to do after the call to show()? In my current situation, I need to extract and display data (images) independently from several different files as part of debugging a larger application. (I'm really not reading a file into the original array, but running some shell commands using os.popen2(...) to eventually populate the array: that part works.)The upshot is that in the course of a few hours, I may have to display (and kill) a large number of images. The current hang means that I have an effective memory leak, and I'd have to keep track of Process IDs and manually kill them every so often. Were the pylab.show() command to return after closing the window (clicking on the X), then a backgrounded or daemon process should terminate. But it doesn't. This seems to be the same problem causing Dragan S.'s problem. I'm not sure if this is a bug or a feature, but would assuredly like to find a way to kill the leak. I'm not sure about the lack of returning after the call show(), though it does sound like a bug. What I *do* know is that multiple calls to show() is frowned upon (if not just completely unsupported). What you probably want to look at is the dynamic_image_gtkagg.py example (in the examples/ directory). Since you're already using GtkAgg, it should be *really* easy to adapt the example to fit your needs. I've personally adapted it to do a live data display of a simulation run. I don't really need any live interaction or a live data display; I just want the thang to stop running (i.e., the process to terminate) when the figure window is closed. Unfortunately, the dynamic_image_gtkagg.py example has the same problem. It's final line is show(). When run as a background process, everything displays well --- but when the window is closed (click on X), the process fails to terminate. So . . . the root cause is that show() does not return when the shown image is closed. If you *need* it to wait for user interaction before continuing, there might be a little bit more work, but I don't think it'd be much. You could probably instead look at some of the Matplotlib UI widgets, like in the buttons.py example. I really don't need user interaction per se, I may have to go that route an establish some sort of close window and exit event. Hmmm: another learning opportunity . . . . :-) The show() function is defined in .../matplotlib/backends/backend_gtk.py and looks to be calling gtk.main(), which, according to .../gtk-2.0/gtk/__init__.py appears to be deprecated in favor of mainloop(). And that's as far as I can go in this: I'm not graphics whiz, and, in fact, having reached somewhat beyond my skill level, can't even figure out how to trace the mainloop call back further. I would think that the gtk mainloop would terminate when the window closes (which termination should propagate back up the stack), but apparently that doesn't happen. Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma Thanks again for your help thus far. James -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) iD8DBQFId5ChxOXthSHeGJIRAqj4AKDG8RGxoQYl5va2olVUV2WQ1zjyOQCeImlr AT+d5Fl2FuF9yWxLaJWbjEg= =wZPg -END PGP SIGNATURE- - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
James K. Gruetzner wrote: I'm running Fedora 8, python 2.5.1, and matplotlib 0.91.2-1.fc8 from the yum repository. Backend is set to GTKAgg in my matplotlibrc file. (On this list top-posting is frowned upon -- it makes the conversation difficult to follow.) I understand. Sorry. Each list is different: I'm new here, and will try remember. No problem. Also, don't forget reply-to-all, so that the whole of the list can chime in here. :) Your analysis is correct, the call to show() activates the GUI mainloop and does not return until the window is closed. Within ipython there is some magic that occurs that runs the mainloop in a separate thread. What do you need to do after the call to show()? In my current situation, I need to extract and display data (images) independently from several different files as part of debugging a larger application. (I'm really not reading a file into the original array, but running some shell commands using os.popen2(...) to eventually populate the array: that part works.)The upshot is that in the course of a few hours, I may have to display (and kill) a large number of images. The current hang means that I have an effective memory leak, and I'd have to keep track of Process IDs and manually kill them every so often. Were the pylab.show() command to return after closing the window (clicking on the X), then a backgrounded or daemon process should terminate. But it doesn't. This seems to be the same problem causing Dragan S.'s problem. I'm not sure if this is a bug or a feature, but would assuredly like to find a way to kill the leak. I'm not sure about the lack of returning after the call show(), though it does sound like a bug. What I *do* know is that multiple calls to show() is frowned upon (if not just completely unsupported). What you probably want to look at is the dynamic_image_gtkagg.py example (in the examples/ directory). Since you're already using GtkAgg, it should be *really* easy to adapt the example to fit your needs. I've personally adapted it to do a live data display of a simulation run. If you *need* it to wait for user interaction before continuing, there might be a little bit more work, but I don't think it'd be much. You could probably instead look at some of the Matplotlib UI widgets, like in the buttons.py example. Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
Thanks for the suggestion, Michael. Reading it led to a bit of a forehead slap. Unfortunately, that didn't work either. Curiously, it appears that the show() command does not return. - CODE SECTION - #!/usr/local/bin/python import os,sys import pylab def main(): x = pylab.linspace(-10,10,100) y = pylab.sin(x) pylab.plot(x,y) sys.stderr.write(Begun.) pylab.show() sys.stderr.write(Done.) if __name__ == __main__: main() END CODE - When executed from the command line: $ ./test.py . . . the plot displays; clicking on the X closes it, but the process keeps on running. When executed as an argument to python: $ python test.py . . . the same behavior (except it's a python process which hangs). The two sys.stderr.write() statements are for debugging. The first one executes; the second does not. My conclusion is that the show() command does not return. -- When I operate interactively, the command pylab.plot(x,y) opens a widow labeled Figure 1. . . . then . . . the command show() writes the plot to that window (i.e., sine plot). Clicking the X in the figure window causes the window to disappear, but the show() command fails to return. -- So . . . I figure that the lack of show() returning is the root problem. Any suggestions? I'm running Fedora 8, python 2.5.1, and matplotlib 0.91.2-1.fc8 from the yum repository. Backend is set to GTKAgg in my matplotlibrc file. James --- On Monday 07 July 2008 17:29:16 you wrote: Why do you want to fork the process? If you just run it in the background it should have the desired effect: begin tst.py from pylab import * x = linspace(-10,10,100) # or load data from a file. y = sin(x) plot(x,y) show() end tst.py $ python tst.py Process remains in background running until the user closes the plot window, at which point it terminates. Michael. On 7 Jul 2008, at 2:30 PM, James K. Gruetzner wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 I'm not sure if this is the right venue for this question. I've searched the archives, but without success so far. If this is covered there (or elsewhere on the web), I'd apprciate a pointer to it so it doesn't duplicate bandwidth here. Anyway, what I'd like to do is have a python script which reads data from a file, displays an image/plot/whatever made from the data, and then exits, keeping the image displayed. I'm running Fedora 8, python 2.5.1, and matplotlib 0.91.2-1.fc8 from the yum repository. Backend is set to GTKAgg in my matplotlibrc file. My initial attempt used the double fork method from the python cookbook: - -Code follows-- if __name__ == __main__: #From Python Cookbook try: pid = os.fork() if pid 0: # Exit first parent sys.exit(0) except OSError, e: print sys.stderr, fork #1 failed: %d (%s) %(e.errno, e.strerror) sys.exit(1) # Decouple from parent environment #os.chdir(/) os.setsid() os.umask(0) # Do second fork try: pid = os.fork() if pid 0: # Exit from second parent; print eventual PID before exiting print Image PID %d % pid sys.exit(0) except OSError, e: print sys.stderr, fork #2 failed: %d (%s)%(e.errno, e.strerror) sys.exit(1) # Start the main loop to display image main() - --END CODE-- The main() function reads the values appropriately into the variable myarr, and then calls imshow and show: - Code follows --- pylab.imshow(myarr) pylab.show() - --END CODE-- . . . and then exits. All works well until I try to kill the figure/image by clicking on the X in the upper-right corner. It disappears alright, but the process remains running, and I have to manually kill it with the kill -SIGTERM pid command. I'd like the process to die when I close the window. I'm really an application programmer, not a system programmer, and usually don't delve this deeply into process management, so I'm probably doing something extremely ignorant. Help is appreciated. Thanks! James --- - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: Re: Autonomous display of image/plot/figure
James K. Gruetzner wrote: Thanks for the suggestion, Michael. Reading it led to a bit of a forehead slap. Unfortunately, that didn't work either. Curiously, it appears that the show() command does not return. - CODE SECTION - #!/usr/local/bin/python import os,sys import pylab def main(): x = pylab.linspace(-10,10,100) y = pylab.sin(x) pylab.plot(x,y) sys.stderr.write(Begun.) pylab.show() sys.stderr.write(Done.) if __name__ == __main__: main() END CODE - When executed from the command line: $ ./test.py . . . the plot displays; clicking on the X closes it, but the process keeps on running. When executed as an argument to python: $ python test.py . . . the same behavior (except it's a python process which hangs). The two sys.stderr.write() statements are for debugging. The first one executes; the second does not. My conclusion is that the show() command does not return. -- When I operate interactively, the command pylab.plot(x,y) opens a widow labeled Figure 1. . . . then . . . the command show() writes the plot to that window (i.e., sine plot). Clicking the X in the figure window causes the window to disappear, but the show() command fails to return. -- So . . . I figure that the lack of show() returning is the root problem. Any suggestions? I'm running Fedora 8, python 2.5.1, and matplotlib 0.91.2-1.fc8 from the yum repository. Backend is set to GTKAgg in my matplotlibrc file. (On this list top-posting is frowned upon -- it makes the conversation difficult to follow.) Your analysis is correct, the call to show() activates the GUI mainloop and does not return until the window is closed. Within ipython there is some magic that occurs that runs the mainloop in a separate thread. What do you need to do after the call to show()? Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
