[Numpy-discussion] a simple examplr showing numpy and matplotlib failing

[Yeates, Mathew C (388D)]

Anybody have any ideas what is going on here. Although I found a workaround, I'm concerned about memory leaks

________________________________
From: numpy-discussion-bounces at scipy.org [mailto:numpy-discussion-bounces at scipy.org] On Behalf Of Yeates, Mathew C (388D)
Sent: Tuesday, December 01, 2009 6:53 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] a simple examplr showing numpy and matplotlib failing

I found  a workaround. If I replace
> plot_data=data[0,0:,0]
With
> plot_data=numpy.copy(data[0,0:,0])

Everything is okay.

I am on Windows XP 64 with 4 Gigs ram. (Note: the data array is greater than 4 Gigs since my datatype is float64. If I decrease the size so that the array is around 3 Gigs, all is good)


Mathew




________________________________
From: numpy-discussion-bounces at scipy.org [mailto:numpy-discussion-bounces at scipy.org] On Behalf Of Santanu Chatterjee
Sent: Tuesday, December 01, 2009 12:15 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] a simple examplr showing numpy and matplotlib failing

Hi Mathew,
    I saw your email and I was curious about it. I tried your code and it does work for me without any problem.

Santanu
On Tue, Dec 1, 2009 at 2:58 PM, Michael Droettboom <mdroe at stsci.edu<mailto:mdroe at stsci.edu>> wrote:
Hmm... works for me. What platform, with how much physical and virtual RAM?

One thing you may want to try is to completely destroy the figure each time:

if fig:
fig.clf()
fig=None

Mike

Yeates, Mathew C (388D) wrote:
>
> Click on "Hello World" twice and get a memory error. Comment out the
> ax.plot call and get no error.
>
> import numpy
>
> import sys
>
> import gtk
>
> from matplotlib.figure import Figure
>
> from matplotlib.backends.backend_gtkagg import FigureCanvasGTKAgg as
> FigureCanvas
>
> ax=None
>
> fig=None
>
> canvas=None
>
> def doplot(widget,box1):
>
> global ax,fig,canvas
>
> data=numpy.zeros(shape=(3508,125,129))
>
> plot_data=data[0,0:,0]
>
> if canvas:
>
> box1.remove(canvas)
>
> canvas=None
>
> if ax:
>
> ax.cla()
>
> ax=None
>
> if fig: fig=None
>
> fig = Figure(figsize=(5,5), dpi=100)
>
> ax = fig.add_subplot(111)
>
> mif=numpy.arange(plot_data.shape[0])
>
> #if the next line is commented out, all is good
>
> ax.plot(plot_data,mif)
>
> canvas = FigureCanvas(fig)
>
> box1.pack_start(canvas, True, True, 0)
>
> canvas.show()
>
> def delete_event(widget, event, data=None):
>
> return False
>
> window = gtk.Window(gtk.WINDOW_TOPLEVEL)
>
> window.connect("destroy", lambda x: gtk.main_quit())
>
> box1 = gtk.HBox(False, 0)
>
> window.add(box1)
>
> button = gtk.Button("Hello World")
>
> box1.pack_start(button, True, True, 0)
>
> #window.add(box1)
>
> button.show()
>
> button.connect("clicked", doplot, box1)
>
> box1.show()
>
> window.set_default_size(500,400)
>
> window.show()
>
> gtk.main()
>
> ------------------------------------------------------------------------
>
> _______________________________________________
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> NumPy-Discussion at scipy.org<mailto:NumPy-Discussion at scipy.org>
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>

--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

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