Hello,
in version 0.98.5.2 the polar plot still has a problem with negativ angles. 
The polarplot is drawing a circle when the angle changes from negativ to 
positiv (e.g. from -0.01 to +0.01).

But in "What new in 0.98.4" 
(http://matplotlib.sourceforge.net/users/whats_new.html) I can read:
"Fix polar interpolation to handle negative values of theta - MGD"

Is there a workaround for this problem?

Regards
Magnus

********************
import numpy as np
import matplotlib
import matplotlib.pyplot as plt

x = np.linspace(-np.pi/3, np.pi/3, 100)
y = np.sin((10*x)**2)+2

plt.subplot(111, polar=True)
plt.plot(x,y)
plt.title(matplotlib.__version__)
plt.show()

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