[Numpy-discussion] Nonblocking Plots with Matplotlib
Wed Mar 14 12:20:27 CDT 2007
what are you using to communicate with the server ?
May I recommend looking at Pyro !
(Python remote objects)
It would allow you to get your proxy objects.
And also handles exception super clean and easy.
I have used it for many years ! It's very stable !
(If you run into problems, take a look at the "one-way" calls to
ensure that functions, that would block, won't wait for the function
Just a thought --
On 3/13/07, Bill Baxter <email@example.com> wrote:
> Howdy Folks,
> I was missing the good ole days of using Matlab back at the Uni when I
> could debug my code, stop at breakpoints and plot various data without
> fear of blocking the interpreter process.
> Using "ipython -pylab" is what has been suggested to me in the past,
> but the problem is I don't do my debugging from ipython. I have a
> very nice IDE that works very well, and it has a lovely interactive
> debugging prompt that I can use to probe my code when stopped at a
> breakpoint. It's great except I can't really use matplotlib for
> debugging there because it causes things to freeze up.
> So I've come up with a decent (though not perfect) solution for
> quickie interactive plots which is to run matplotlib in a separate
> process. I call the result it 'ezplot'. The first alpha version of
> this is now available at the Cheeseshop. (I made an egg too, so if
> you have setuptools you can do "easy_install ezplot".)
> The basic usage is like so:
> In : import ezplot
> In : p = ezplot.Plotter()
> In : p.plot([1,2,3],[1,4,9],marker='o')
> Connecting to server... waiting...
> connected to plotserver 0.1.0a1 on http://localhost:8397
> Out: True
> In : from numpy import *
> In : x = linspace(-5,5,20)
> In : p.clf()
> Out: True
> In : p.plot(x, x*x*log(x*x+0.01))
> (Imagine lovely plots popping up on your screen as these commands are typed.)
> The only return values you get back are True (success...probably) or
> False (failure...for sure). So no fancy plot object manipulation is
> possible. But you can do basic plots no problem.
> The nice part is that this (unlike ipython's built-in -pylab threading
> mojo) should work just as well from wherever you're using python.
> Whether it's ipython (no -pylab) or Idle, or a plain MS-DOS console,
> or WingIDE's debug probe, or SPE, or a PyCrust shell or whatever. It
> doesn't matter because all the client is doing is packing up data and
> shipping over a socket. All the GUI plotting mojo happens in a
> completely separate process.
> There are plenty of ways this could be made better, but for me, for
> now, this probably does pretty much all I need, so it's back to Real
> Work. But if anyone is interested in making improvements to this, let
> me know.
> Here's a short list of things that could be improved:
> * Right now I assume use of the wxAGG backend for matplotlib. Don't
> know how much work it would be to support other back ends (or how to
> go about it, really). wxAGG is what I always use.
> * Returning more error/exception info from the server would be nice
> * Returning full fledged proxy plot objects would be nice too, but I
> suspect that's a huge effort
> * SOAP may be better for this than xmlrpclib but I just couldn't get
> it to work (SOAPpy + Twisted).
> * A little more safety would be nice. Anyone know how to make a
> Twisted xmlrpc server not accept connections from anywhere except
> * There's a little glitch in that the spawned plot server dies with
> the parent that created it. Maybe there's a flag to subprocess.Popen
> to fix that?
> * Sometimes when you click on "Exit Server", if there are plot windows
> open it hangs while shutting down.
> Only tested on Win32 but there's nothing much platform specific in there.
> Give it a try and let me know what you think!
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