matplotlib/examples/api/unicode_minus.py at master · unutbu/matplotlib · GitHub

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"""

You can use the proper typesetting unicode minus (see

http://en.wikipedia.org/wiki/Plus_sign#Plus_sign) or the ASCII hypen

for minus, which some people prefer. The matplotlibrc param

axes.unicode_minus controls the default behavior.

The default is to use the unicode minus

"""

import numpy as np

import matplotlib

import matplotlib.pyplot as plt

matplotlib.rcParams['axes.unicode_minus'] = False

fig, ax = plt.subplots()

ax.plot(10*np.random.randn(100), 10*np.random.randn(100), 'o')

ax.set_title('Using hypen instead of unicode minus')

plt.show()