Re: [Matplotlib-users] memory problem

[Perry G. <pe...@st...>]

It's clear you are running out of memory. The image you are displaying  
is on the order of 64MB in size. While the single array itself isn't  
enough to consume all your memory, it isn't clear what other memory is  
in use, or what your page size is, etc. Matplotlib will create some  
temporaries in the process of scaling arrays for display, so I wouldn't  
be surprised to see this image require a few more times that amount of  
memory.

Perry

On Apr 1, 2005, at 9:51 AM, Humufr wrote:

>                    Hi,
>
> on a pc with linux and 512M of RAM, I have a problem of memory when  
> I'm using matplotlib.
>
> from pylab import *
> imshow(zeros((2000,2000)))
> show()
>
> is working but:
>
> from pylab import *
> imshow(zeros((4000,4000)))
> show()
>
> is not.
>
>
> That slow down the computer, it close to be freeze and I obtain this  
> error (the two error message for show() and savefig('test.png') are at  
> the bottom of the mail. (matshow give exactly the same result)
>
> It's a big problem, for me at least, because I'm working with some  
> image with 4000x4000 pixels.
>
> Thanks,
>
>       N.
>
> Exception in Tkinter callback
> Traceback (most recent call last):
>  File "/usr/local/lib/python2.4/lib-tk/Tkinter.py", line 1345, in  
> __call__
>    return self.func(*args)
>  File  
> "/usr/local/lib/python2.4/site-packages/matplotlib/backends/ 
> backend_tkagg.py", line 140, in resize
>    self.show()
>  File  
> "/usr/local/lib/python2.4/site-packages/matplotlib/backends/ 
> backend_tkagg.py", line 143, in draw
>    FigureCanvasAgg.draw(self)
>  File  
> "/usr/local/lib/python2.4/site-packages/matplotlib/backends/ 
> backend_agg.py", line 312, in draw
>    self.figure.draw(renderer)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/figure.py",  
> line 395, in draw
>    for a in self.axes: a.draw(renderer)
>  File  
> "/scratch/gruel/usr/local/lib/python2.4/site-packages/matplotlib/ 
> axes.py", line 1339, in draw
>    im.draw(renderer)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/image.py",  
> line 182, in draw
>    im = self.make_image(isUpper)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/image.py",  
> line 112, in make_image
>    x = self.to_rgba(self._A, self._alpha)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/cm.py", line  
> 418, in to_rgba
>    return self.cmap(x, alpha)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/colors.py",  
> line 526, in __call__
>    rgba = zeros(xa.shape+(4,), Float)
>  File  
> "/usr/local/lib/python2.4/site-packages/numarray/numarraycore.py",  
> line 1407, in zeros
>    retarr = NumArray(shape=shape, type=type)
> MemoryError: Couldn't allocate requested memory
>
>
> I did the same with savefig
>
> Traceback (most recent call last):
>  File "test.py", line 12, in ?
>    savefig('test.png')
>  File  
> "/scratch/gruel/usr/local/lib/python2.4/site-packages/matplotlib/ 
> pylab.py", line 719, in savefig
>    return fig.savefig(*args, **kwargs)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/figure.py",  
> line 512, in savefig
>    self.canvas.print_figure(*args, **kwargs)
>  File  
> "/usr/local/lib/python2.4/site-packages/matplotlib/backends/ 
> backend_tkagg.py", line 161, in print_figure
>    agg.print_figure(filename, dpi, facecolor, edgecolor, orientation)
>  File  
> "/usr/local/lib/python2.4/site-packages/matplotlib/backends/ 
> backend_agg.py", line 375, in print_figure
>    self.draw()
>  File  
> "/usr/local/lib/python2.4/site-packages/matplotlib/backends/ 
> backend_agg.py", line 312, in draw
>    self.figure.draw(renderer)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/figure.py",  
> line 395, in draw
>    for a in self.axes: a.draw(renderer)
>  File  
> "/scratch/gruel/usr/local/lib/python2.4/site-packages/matplotlib/ 
> axes.py", line 1339, in draw
>    im.draw(renderer)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/image.py",  
> line 182, in draw
>    im = self.make_image(isUpper)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/image.py",  
> line 112, in make_image
>    x = self.to_rgba(self._A, self._alpha)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/cm.py", line  
> 418, in to_rgba
>    return self.cmap(x, alpha)
>  File "/usr/local/lib/python2.4/site-packages/matplotlib/colors.py",  
> line 526, in __call__
>    rgba = zeros(xa.shape+(4,), Float)
>  File  
> "/usr/local/lib/python2.4/site-packages/numarray/numarraycore.py",  
> line 1407, in zeros
>    retarr = NumArray(shape=shape, type=type)
> MemoryError: Couldn't allocate requested memory
>
>
>
>
>
>
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