I get an exception when I set up a bar chart with a picker that has a bar with
0 height, and I click on the chart.
Code to generate exception:
from matplotlib.pyplot import figure, show
import numpy as np
def onpick1(event):
print 'foo'
fig = figure()
ax = fig.add_subplot(111)
xdata = [1, 2, 3]
ydata = [1, 0, 3] #change to [1, 2, 3] and code will run fine
ax.bar(xdata,
ydata,
picker = True)
fig.canvas.mpl_connect('pick_event', onpick1)
show()
#now click on chart
-----
Exception generated:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python24\lib\lib-tk\Tkinter.py", line 1345, in __call__
return self.func(*args)
File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_tkagg.py",
line 236, in button_press_event
FigureCanvasBase.button_press_event(self, x, y, num, guiEvent=event)
File "C:\Python24\Lib\site-packages\matplotlib\backend_bases.py", line 1074,
in button_press_event
self.callbacks.process(s, mouseevent)
File "C:\Python24\Lib\site-packages\matplotlib\cbook.py", line 152, in process
func(*args, **kwargs)
File "C:\Python24\Lib\site-packages\matplotlib\backend_bases.py", line 983,
in pick
self.figure.pick(mouseevent)
File "C:\Python24\Lib\site-packages\matplotlib\artist.py", line 226, in pick
for a in self.get_children(): a.pick(mouseevent)
File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 2306, in pick
martist.Artist.pick(self,args[0])
File "C:\Python24\Lib\site-packages\matplotlib\artist.py", line 226, in pick
for a in self.get_children(): a.pick(mouseevent)
File "C:\Python24\Lib\site-packages\matplotlib\artist.py", line 220, in pick
inside,prop = self.contains(mouseevent)
File "C:\Python24\Lib\site-packages\matplotlib\patches.py", line 385, in
contains
x, y = self.get_transform().inverted().transform_point(
File "C:\Python24\Lib\site-packages\matplotlib\transforms.py", line 1840, in
inverted
return CompositeGenericTransform(self._b.inverted(), self._a.inverted())
File "C:\Python24\Lib\site-packages\matplotlib\transforms.py", line 1338, in
inverted
self._inverted = Affine2D(inv(mtx))
File "C:\Python24\Lib\site-packages\numpy\linalg\linalg.py", line 332, in inv
return wrap(solve(a, identity(a.shape[0], dtype=a.dtype)))
File "C:\Python24\Lib\site-packages\numpy\linalg\linalg.py", line 235, in
solve
raise LinAlgError, 'Singular matrix'
LinAlgError: Singular matrix
--------------
Stats:
MPL 0.98.1
Python 2.4.4
Numpy 1.1.0
I get the error on both Windows and Linux
Thanks,
-Ben
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