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Ok thank you - so one way to work around it is to just generate the files I
want in batches so Windows won't run out of file handles - but is there a
way to know how many handles are available? I'm trying to animate some data
and I don't really know how many frames there are - could be thousands.
Andy
On Fri, Mar 23, 2012 at 3:45 PM, Michael Droettboom <md...@st...> wrote:
> This is a known bug on Windows where it runs out of file handles after a
> while.
>
> This commit was an attempt to fix it, but it doesn't seem to work:
>
>
> https://github.com/matplotlib/matplotlib/commit/4cb2aaa87b0aa9efe7178d7510d3d091ef5206df
>
> I think we need a Windows user/developer/expert to get to the bottom of
> why file handles are not being freed to the OS.
>
> Mike
>
>
> On 03/23/2012 04:35 PM, Andrew Smart wrote:
>
> Hi,
> I'm running into this RuntimeError: Could not open facefile
> c:\Python32\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf;
> Cannot_Open_Resource when I'm trying to save out a series of *.png files in
> a loop. It crashes on this error after many passes through the loop and
> successful files get created, but then always on the same pass it does
> this. The full traceback is here:
>
> File
> "C:\Users\E440710\Desktop\PythonTransfer\fittslaw_ThroughputCalc_AS_break.py",
> line 744, in <module>
> fig.savefig(fname, transparent = True)
> File "c:\Python32\lib\site-packages\matplotlib\figure.py", line 1174, in
> savefig
> self.canvas.print_figure(*args, **kwargs)
> File "c:\Python32\lib\site-packages\matplotlib\backend_bases.py", line
> 2027, in print_figure
> **kwargs)
> File "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py",
> line 451, in print_png
> FigureCanvasAgg.draw(self)
> File "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py",
> line 400, in draw
> self.figure.draw(self.renderer)
> File "c:\Python32\lib\site-packages\matplotlib\artist.py", line 56, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "c:\Python32\lib\site-packages\matplotlib\figure.py", line 887, in
> draw
> func(*args)
> File "c:\Python32\lib\site-packages\matplotlib\artist.py", line 56, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "c:\Python32\lib\site-packages\matplotlib\axes.py", line 1985, in
> draw
> a.draw(renderer)
> File "c:\Python32\lib\site-packages\matplotlib\artist.py", line 56, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "c:\Python32\lib\site-packages\matplotlib\axis.py", line 1043, in
> draw
> ticklabelBoxes, ticklabelBoxes2 = self._get_tick_bboxes(ticks_to_draw,
> renderer)
> File "c:\Python32\lib\site-packages\matplotlib\axis.py", line 994, in
> _get_tick_bboxes
> extent = tick.label1.get_window_extent(renderer)
> File "c:\Python32\lib\site-packages\matplotlib\text.py", line 743, in
> get_window_extent
> bbox, info = self._get_layout(self._renderer)
> File "c:\Python32\lib\site-packages\matplotlib\text.py", line 296, in
> _get_layout
> ismath=False)
> File "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py",
> line 182, in get_text_width_height_descent
> font = self._get_agg_font(prop)
> File "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py",
> line 223, in _get_agg_font
> font = FT2Font(str(fname))
> RuntimeError: Could not open facefile
> c:\Python32\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf;
> Cannot_Open_Resource
>
> I've tried the various fixes that have been suggested - removing the
> fontList.py3k.cache and even the removing the .matplotlib directory.
> However when I run my script that's producing the error the directory gets
> recreated along with the fontList.py3k.cache which must be pointing to the
> wrong path?
>
> When I check the path
> c:\Python32\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf where
> matplotlib is looking for the resource it cannot open - the Vera.ttf is
> there.
>
> This only happens after many iterations through the loop that is saving
> out the *.png files and I have no idea why.
>
> The relevant code from my script is here:
>
> for p in plotData[k]["data"]:
> #print("p in plotData[k]:",p)
> a = numpy.array((loc[0],loc[1]))
> b = numpy.array((p[0],p[1]))
> distValue = (numpy.sqrt(numpy.sum((a-b)**2) ))/86.0 #divide by
> 86 because that was the ppi on the display used to collect the data
> if p[2] == 1:
> hit_x.append(loc[0]-p[0])
>
> hit_y.append(loc[1]-p[1])
>
> frame_hit_x = loc[0]-p[0]
> frame_hit_y = loc[1]-p[1]
> print("frame_x:", frame_hit_x)
> files = []
> if size == (0.25,0.25) and makeMovie:
>
> fig = plt.figure()
> print("fig:", fig)
>
> plt.plot(frame_hit_x,frame_hit_y,color='green',marker='o',linestyle='')
>
> plt.axis('scaled')
> plt.axis([-100,100,-100,100])
>
> fname =
> "subj{:g}_size{:g}_hit_x{:g}.png".format(Subject,btnSize,frame_hit_x)
> print('saving frame', fname)
> fig.savefig(fname, transparent = True)
> files.append(fname)
>
> I'm on a Win7 64bit using python 3.2 and matplotlib version 1.2.x
>
> Any help would be greatly appreciated!
>
> Andy
>
>
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>
>
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>
>
>
>
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>
>

This is a known bug on Windows where it runs out of file handles after a 
while.
This commit was an attempt to fix it, but it doesn't seem to work:
https://github.com/matplotlib/matplotlib/commit/4cb2aaa87b0aa9efe7178d7510d3d091ef5206df
I think we need a Windows user/developer/expert to get to the bottom of 
why file handles are not being freed to the OS.
Mike
On 03/23/2012 04:35 PM, Andrew Smart wrote:
> Hi,
> I'm running into this RuntimeError: Could not open facefile 
> c:\Python32\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf; 
> Cannot_Open_Resource when I'm trying to save out a series of *.png 
> files in a loop. It crashes on this error after many passes through 
> the loop and successful files get created, but then always on the same 
> pass it does this. The full traceback is here:
>
> File 
> "C:\Users\E440710\Desktop\PythonTransfer\fittslaw_ThroughputCalc_AS_break.py", 
> line 744, in <module>
> fig.savefig(fname, transparent = True)
> File "c:\Python32\lib\site-packages\matplotlib\figure.py", line 
> 1174, in savefig
> self.canvas.print_figure(*args, **kwargs)
> File "c:\Python32\lib\site-packages\matplotlib\backend_bases.py", 
> line 2027, in print_figure
> **kwargs)
> File 
> "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py", 
> line 451, in print_png
> FigureCanvasAgg.draw(self)
> File 
> "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py", 
> line 400, in draw
> self.figure.draw(self.renderer)
> File "c:\Python32\lib\site-packages\matplotlib\artist.py", line 56, 
> in draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "c:\Python32\lib\site-packages\matplotlib\figure.py", line 887, 
> in draw
> func(*args)
> File "c:\Python32\lib\site-packages\matplotlib\artist.py", line 56, 
> in draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "c:\Python32\lib\site-packages\matplotlib\axes.py", line 1985, 
> in draw
> a.draw(renderer)
> File "c:\Python32\lib\site-packages\matplotlib\artist.py", line 56, 
> in draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "c:\Python32\lib\site-packages\matplotlib\axis.py", line 1043, 
> in draw
> ticklabelBoxes, ticklabelBoxes2 = 
> self._get_tick_bboxes(ticks_to_draw, renderer)
> File "c:\Python32\lib\site-packages\matplotlib\axis.py", line 994, 
> in _get_tick_bboxes
> extent = tick.label1.get_window_extent(renderer)
> File "c:\Python32\lib\site-packages\matplotlib\text.py", line 743, 
> in get_window_extent
> bbox, info = self._get_layout(self._renderer)
> File "c:\Python32\lib\site-packages\matplotlib\text.py", line 296, 
> in _get_layout
> ismath=False)
> File 
> "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py", 
> line 182, in get_text_width_height_descent
> font = self._get_agg_font(prop)
> File 
> "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py", 
> line 223, in _get_agg_font
> font = FT2Font(str(fname))
> RuntimeError: Could not open facefile 
> c:\Python32\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf; 
> Cannot_Open_Resource
>
> I've tried the various fixes that have been suggested - removing the 
> fontList.py3k.cache and even the removing the .matplotlib directory. 
> However when I run my script that's producing the error the directory 
> gets recreated along with the fontList.py3k.cache which must be 
> pointing to the wrong path?
>
> When I check the path 
> c:\Python32\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf 
> where matplotlib is looking for the resource it cannot open - the 
> Vera.ttf is there.
>
> This only happens after many iterations through the loop that is 
> saving out the *.png files and I have no idea why.
>
> The relevant code from my script is here:
>
> for p in plotData[k]["data"]:
> #print("p in plotData[k]:",p)
> a = numpy.array((loc[0],loc[1]))
> b = numpy.array((p[0],p[1]))
> distValue = (numpy.sqrt(numpy.sum((a-b)**2) ))/86.0 
> #divide by 86 because that was the ppi on the display used to collect 
> the data
> if p[2] == 1:
> hit_x.append(loc[0]-p[0])
>
> hit_y.append(loc[1]-p[1])
>
> frame_hit_x = loc[0]-p[0]
> frame_hit_y = loc[1]-p[1]
> print("frame_x:", frame_hit_x)
> files = []
> if size == (0.25,0.25) and makeMovie:
>
> fig = plt.figure()
> print("fig:", fig)
> 
> plt.plot(frame_hit_x,frame_hit_y,color='green',marker='o',linestyle='')
>
> plt.axis('scaled')
> plt.axis([-100,100,-100,100])
>
> fname = 
> "subj{:g}_size{:g}_hit_x{:g}.png".format(Subject,btnSize,frame_hit_x)
> print('saving frame', fname)
> fig.savefig(fname, transparent = True)
> files.append(fname)
>
> I'm on a Win7 64bit using python 3.2 and matplotlib version 1.2.x
>
> Any help would be greatly appreciated!
>
> Andy
>
>
> ------------------------------------------------------------------------------
> This SF email is sponsosred by:
> Try Windows Azure free for 90 days Click Here
> http://p.sf.net/sfu/sfd2d-msazure
>
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Hi,
I'm running into this RuntimeError: Could not open facefile
c:\Python32\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf;
Cannot_Open_Resource when I'm trying to save out a series of *.png files in
a loop. It crashes on this error after many passes through the loop and
successful files get created, but then always on the same pass it does
this. The full traceback is here:
 File
"C:\Users\E440710\Desktop\PythonTransfer\fittslaw_ThroughputCalc_AS_break.py",
line 744, in <module>
 fig.savefig(fname, transparent = True)
 File "c:\Python32\lib\site-packages\matplotlib\figure.py", line 1174, in
savefig
 self.canvas.print_figure(*args, **kwargs)
 File "c:\Python32\lib\site-packages\matplotlib\backend_bases.py", line
2027, in print_figure
 **kwargs)
 File "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py",
line 451, in print_png
 FigureCanvasAgg.draw(self)
 File "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py",
line 400, in draw
 self.figure.draw(self.renderer)
 File "c:\Python32\lib\site-packages\matplotlib\artist.py", line 56, in
draw_wrapper
 draw(artist, renderer, *args, **kwargs)
 File "c:\Python32\lib\site-packages\matplotlib\figure.py", line 887, in
draw
 func(*args)
 File "c:\Python32\lib\site-packages\matplotlib\artist.py", line 56, in
draw_wrapper
 draw(artist, renderer, *args, **kwargs)
 File "c:\Python32\lib\site-packages\matplotlib\axes.py", line 1985, in
draw
 a.draw(renderer)
 File "c:\Python32\lib\site-packages\matplotlib\artist.py", line 56, in
draw_wrapper
 draw(artist, renderer, *args, **kwargs)
 File "c:\Python32\lib\site-packages\matplotlib\axis.py", line 1043, in
draw
 ticklabelBoxes, ticklabelBoxes2 = self._get_tick_bboxes(ticks_to_draw,
renderer)
 File "c:\Python32\lib\site-packages\matplotlib\axis.py", line 994, in
_get_tick_bboxes
 extent = tick.label1.get_window_extent(renderer)
 File "c:\Python32\lib\site-packages\matplotlib\text.py", line 743, in
get_window_extent
 bbox, info = self._get_layout(self._renderer)
 File "c:\Python32\lib\site-packages\matplotlib\text.py", line 296, in
_get_layout
 ismath=False)
 File "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py",
line 182, in get_text_width_height_descent
 font = self._get_agg_font(prop)
 File "c:\Python32\lib\site-packages\matplotlib\backends\backend_agg.py",
line 223, in _get_agg_font
 font = FT2Font(str(fname))
RuntimeError: Could not open facefile
c:\Python32\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf;
Cannot_Open_Resource
I've tried the various fixes that have been suggested - removing the
fontList.py3k.cache and even the removing the .matplotlib directory.
However when I run my script that's producing the error the directory gets
recreated along with the fontList.py3k.cache which must be pointing to the
wrong path?
When I check the path
c:\Python32\lib\site-packages\matplotlib\mpl-data\fonts\ttf\Vera.ttf where
matplotlib is looking for the resource it cannot open - the Vera.ttf is
there.
This only happens after many iterations through the loop that is saving out
the *.png files and I have no idea why.
The relevant code from my script is here:
for p in plotData[k]["data"]:
 #print("p in plotData[k]:",p)
 a = numpy.array((loc[0],loc[1]))
 b = numpy.array((p[0],p[1]))
 distValue = (numpy.sqrt(numpy.sum((a-b)**2) ))/86.0 #divide by
86 because that was the ppi on the display used to collect the data
 if p[2] == 1:
 hit_x.append(loc[0]-p[0])
 hit_y.append(loc[1]-p[1])
 frame_hit_x = loc[0]-p[0]
 frame_hit_y = loc[1]-p[1]
 print("frame_x:", frame_hit_x)
 files = []
 if size == (0.25,0.25) and makeMovie:
 fig = plt.figure()
 print("fig:", fig)
plt.plot(frame_hit_x,frame_hit_y,color='green',marker='o',linestyle='')
 plt.axis('scaled')
 plt.axis([-100,100,-100,100])
 fname =
"subj{:g}_size{:g}_hit_x{:g}.png".format(Subject,btnSize,frame_hit_x)
 print('saving frame', fname)
 fig.savefig(fname, transparent = True)
 files.append(fname)
I'm on a Win7 64bit using python 3.2 and matplotlib version 1.2.x
Any help would be greatly appreciated!
Andy

On 03/23/2012 08:05 AM, Albert Kottke wrote:
> I am having problems clearing figures from memory. After saving the
> figure, I use pyplot.close() on the figure handle and then del all of
> the data and figure, as shown here:
>
> fig.savefig('plots/%(record_id)05i' % recording)
> plt.close(fig)
>
> del accel, fourier_amp, fig, time, disp
> gc.collect()
>
> Despite this, the figures don't appear to be closing. I am trying to
> make 30k plots and I have to kill script every couple thousand and
> restart because I run out of memory.
>
> Any suggestions?
You are running a standalone script, correct? Make sure you are using 
only the agg backend. Before the first import of pyplot, do
import matplotlib
matplotlib.use("agg")
I don't know if that will help, but it can't hurt.
You might find matplotlib.cbook.report_memory() to be useful in tracking 
down the problem.
Eric
>
>
> Albert
>
> ------------------------------------------------------------------------------
> This SF email is sponsosred by:
> Try Windows Azure free for 90 days Click Here
> http://p.sf.net/sfu/sfd2d-msazure
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

I am having problems clearing figures from memory. After saving the
figure, I use pyplot.close() on the figure handle and then del all of
the data and figure, as shown here:
fig.savefig('plots/%(record_id)05i' % recording)
plt.close(fig)
del accel, fourier_amp, fig, time, disp
gc.collect()
Despite this, the figures don't appear to be closing. I am trying to
make 30k plots and I have to kill script every couple thousand and
restart because I run out of memory.
Any suggestions?
Albert

The shapes of X, Y, and Z must match. After the mesh grid, Z no longer
matches X and Y.
Ben Root
(I will be out of contact for at least a week, sorry I won't be able to
help any further till then.)

Hi, I have three variables I would like to plot using plot_surface but I 
keep getting the error given at the bottom. Anyone know what I am doing 
wrong?? My code is as follows,
fig3 = plt.figure()
ax = Axes3D(fig3)
X = np.zeros((78,1))
Y = np.zeros((78,1))
Z = np.zeros((78,1))
for p in range(len(data)):
 X[p,0] = data[p][1] #distance
 Y[p,0] = data[p][3] #azimuth
 Z[p,0] = data[p][4] #snr
X, Y = np.meshgrid(X, Y)
surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, cmap=cm.jet)
ValueError Traceback (most recent call last)
/home/davcra/python_scripts/plot_snr_az.py in <module>()
 48 Z[p,0] = data[p][4] #snr
 49 X, Y = np.meshgrid(X, Y)
---> 50 surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, cmap=cm.jet)
 51 #fig.colorbar(surf, shrink=0.5, aspect=5)
 52 #plt.show()
/usr/lib64/python2.6/site-packages/mpl_toolkits/mplot3d/axes3d.pyc in 
plot_surface(self, X, Y, Z, *args, **kwargs)
 616 normals.append(np.cross(v1, v2))
 617
--> 618 polyc = art3d.Poly3DCollection(polys, *args, **kwargs)
 619 if cmap is not None:
 620 polyc.set_array(np.array(avgz))
/usr/lib64/python2.6/site-packages/mpl_toolkits/mplot3d/art3d.pyc in 
__init__(self, verts, *args, **kwargs)
 282 '''
 283
--> 284 PolyCollection.__init__(self, verts, *args, **kwargs)
 285 self._zsort = 1
 286 self._sort_zpos = None
/usr/lib64/python2.6/site-packages/matplotlib/collections.pyc in 
__init__(self, verts, sizes, closed, **kwargs)
 666 Collection.__init__(self,**kwargs)
 667 self._sizes = sizes
--> 668 self.set_verts(verts, closed)
 669 __init__.__doc__ = cbook.dedent(__init__.__doc__) % 
artist.kwdocd
 670
/usr/lib64/python2.6/site-packages/mpl_toolkits/mplot3d/art3d.pyc in 
set_verts(self, verts, closed)
 304 def set_verts(self, verts, closed=True):
 305 '''Set 3D vertices.'''
--> 306 self.get_vector(verts)
 307 # 2D verts will be updated at draw time
 308 PolyCollection.set_verts(self, [], closed)
/usr/lib64/python2.6/site-packages/mpl_toolkits/mplot3d/art3d.pyc in 
get_vector(self, segments3d)
 297 segis.append((si, ei))
 298 si = ei
--> 299 xs, ys, zs = zip(*points)
 300 ones = np.ones(len(xs))
 301 self._vec = np.array([xs, ys, zs, ones])
ValueError: need more than 0 values to unpack
WARNING: Failure executing file: <plot_snr_az.py>
thanks,
David