2012/11/1 Hans Bering <hans.ber...@arcor.de>: > Hello everybody, > > I'm building a small Tkinter GUI using matplotlib, in which I have to > change/update plots quite often depending on user input (with different > contents & sizes, in different places in the GUI, etc.; but always only > one figure at a time). > > As a first resort, I regenerated the figures with plt.figure(...) whenever > necessary; unfortunately, the program happily accumulated memory with > every new figure until the computer would no longer cooperate in a timely > fashion. The following minimal script should demonstrate the tendency: > ... > Now I am wondering if I am missing some detail, e.g., some other clean-up > procedure? Or should this work & could be a memory leak in matplotlib or > Tkinter? And/or is this approach (of generating a new figure every time) > not recommended in the first place? I tried reusing the figure, but some > aspects like changing the layout in the GUI and applying new size and dpi > then proved tricky in their own ways. > > Many thanks in advance, > Hans > Hi, I'd recommend to use an embedded plot and only clear and replace its content (rather than tu use pyplot and recreate the figure multiple times. I believe, changing of the figure should be possible too.
see e.g. the sample for tkinter http://matplotlib.org/examples/user_interfaces/embedding_in_tk.html I only roughly adapted that source to use your function and the memory usage appears to be more effective (although there is some increase too - as displayed in Process Explorer). Would some variation of the following work for you? hth, vbr ######################################## #!/usr/bin/env python import matplotlib matplotlib.use('TkAgg') import math from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg from matplotlib.figure import Figure import Tkinter root = Tkinter.Tk() root.wm_title("Embedding in TK") fig = Figure(figsize=(5,4), dpi=100) ax = fig.add_subplot(111) canvas = FigureCanvasTkAgg(fig, master=root) canvas.show() canvas.get_tk_widget().pack(side=Tkinter.TOP, fill=Tkinter.BOTH, expand=1) toolbar = NavigationToolbar2TkAgg( canvas, root ) toolbar.update() canvas._tkcanvas.pack(side=Tkinter.TOP, fill=Tkinter.BOTH, expand=1) plotShift = 0 def replot(): global plotShift, a, f ax.clear() xVals = xrange(100) ax.plot(xVals, [math.sin(x + plotShift) for x in xVals]) fig.canvas.draw() plotShift += 10 button = Tkinter.Button(master=root, text='replot', command=replot) button.pack(side=Tkinter.BOTTOM) Tkinter.mainloop() ------------------------------------------------------------------------------ LogMeIn Central: Instant, anywhere, Remote PC access and management. Stay in control, update software, and manage PCs from one command center Diagnose problems and improve visibility into emerging IT issues Automate, monitor and manage. Do more in less time with Central http://p.sf.net/sfu/logmein12331_d2d _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
