Given the following matplotlib program:
##
import numpy as np
import matplotlib.pyplot as plt
x = np.arange(3)
width = 0.35
hdfs = (292.97, 304.49, 305.47)
bfs = (614.57, 706.02, 847.44)
plt.subplot(111)
hdfs_rects = plt.bar(x, hdfs, width, color='b')
bfs_rects = plt.bar(x + width, bfs, width, color='g', hatch='/')
plt.xticks(x + width, ('100 ls ops', '100 touch ops', '100 0k copy ops'))
plt.ylabel('Time (sec)')
plt.title('Metadata Performance')
plt.legend((hdfs_rects[0], bfs_rects[0]), ('HDFS', 'BoomFS'), loc='upper right')
plt.ylim([0, 1200])
plt.savefig('metadata_throughput.pdf')
##
I see the following error using matplotlib 0.95.1:
Traceback (most recent call last):
File "metadata_throughput.py", line 21, in <module>
plt.savefig('metadata_throughput.pdf')
File "/opt/local/lib/python2.5/site-packages/matplotlib/pyplot.py",
line 345, in savefig
return fig.savefig(*args, **kwargs)
File "/opt/local/lib/python2.5/site-packages/matplotlib/figure.py",
line 990, in savefig
self.canvas.print_figure(*args, **kwargs)
File "/opt/local/lib/python2.5/site-packages/matplotlib/backend_bases.py",
line 1419, in print_figure
**kwargs)
File "/opt/local/lib/python2.5/site-packages/matplotlib/backend_bases.py",
line 1313, in print_pdf
return pdf.print_pdf(*args, **kwargs)
File
"/opt/local/lib/python2.5/site-packages/matplotlib/backends/backend_pdf.py",
line 1883, in print_pdf
self.figure.draw(renderer)
File "/opt/local/lib/python2.5/site-packages/matplotlib/figure.py",
line 772, in draw
for a in self.axes: a.draw(renderer)
File "/opt/local/lib/python2.5/site-packages/matplotlib/axes.py",
line 1601, in draw
a.draw(renderer)
File "/opt/local/lib/python2.5/site-packages/matplotlib/patches.py",
line 301, in draw
renderer.draw_path(gc, tpath, affine, rgbFace)
File
"/opt/local/lib/python2.5/site-packages/matplotlib/backends/backend_pdf.py",
line 1248, in draw_path
self.check_gc(gc, rgbFace)
File
"/opt/local/lib/python2.5/site-packages/matplotlib/backends/backend_pdf.py",
line 1203, in check_gc
delta = self.gc.delta(gc)
File
"/opt/local/lib/python2.5/site-packages/matplotlib/backends/backend_pdf.py",
line 1813, in delta
cmds.extend(cmd(self, *theirs))
File
"/opt/local/lib/python2.5/site-packages/matplotlib/backends/backend_pdf.py",
line 1725, in hatch_cmd
name = self.file.hatchPattern(lst)
File
"/opt/local/lib/python2.5/site-packages/matplotlib/backends/backend_pdf.py",
line 945, in hatchPattern
return pattern[0]
AttributeError: Name instance has no attribute '__getitem__'
If I change the savefig() call to emit EPS or PNG instead, e.g:
plt.savefig('metadata_throughput.eps')
The program works fine, and I get the output I'd expect. Does anyone
have any suggestions about what's going wrong here?
Thanks in advance,
Neil
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