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"""
The new ticker code was designed to explicitly support user customized
ticking. The documentation
http://matplotlib.org/matplotlib.ticker.html details this
process. That code defines a lot of preset tickers but was primarily
designed to be user extensible.
In this example a user defined function is used to format the ticks in
millions of dollars on the y axis
"""
from matplotlib.ticker import FuncFormatter
import matplotlib.pyplot as plt
import numpy as np
x = np.arange(4)
money = [1.5e5, 2.5e6, 5.5e6, 2.0e7]
def millions(x, pos):
'The two args are the value and tick position'
return '$%1.1fM' % (x*1e-6)
formatter = FuncFormatter(millions)
fig, ax = plt.subplots()
ax.yaxis.set_major_formatter(formatter)
plt.bar(x, money)
plt.xticks(x, ('Bill', 'Fred', 'Mary', 'Sue'))
plt.show()
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