Matplotlib：自定义对数标签

日期2008-09-17（最后修改），2008-09-17（创建）

如何用整数标签替换默认的对数图指数标签的示例。相同的方法适用于任何类型的自定义标签。此示例来自 Python-list 邮件列表，原始示例可以在这里找到 这里.

In [1]
from matplotlib.pyplot import *

def log_10_product(x, pos):
    """The two args are the value and tick position.
    Label ticks with the product of the exponentiation"""
    return '%1i' % (x)

# Axis scale must be set prior to declaring the Formatter
# If it is not the Formatter will use the default log labels for ticks.
ax = subplot(111)
ax.set_xscale('log')
ax.set_yscale('log')

formatter = FuncFormatter(log_10_product)
ax.xaxis.set_major_formatter(formatter)
ax.yaxis.set_major_formatter(formatter)

# Create some artificial data.
result1 = [3, 5, 70, 700, 900]
result2 = [1000, 2000, 3000, 4000, 5000]
predict1 = [4, 8, 120, 160, 200]
predict2 = [2000, 4000, 6000, 8000, 1000]

# Plot
ax.scatter(result1, predict1, s=40, c='b', marker='s', faceted=False)
ax.scatter(result2, predict2, s=40, c='r', marker='s', faceted=False)

ax.set_xlim(1e-1, 1e4)
ax.set_ylim(1e-1, 1e4)
grid(True)

xlabel(r"Result", fontsize = 12)
ylabel(r"Prediction", fontsize = 12)

/usr/lib/python2.7/dist-packages/matplotlib/cbook.py:137: MatplotlibDeprecationWarning: The faceted option was deprecated in version 1.2. Use edgecolor instead.
  warnings.warn(message, mplDeprecation, stacklevel=1)
Out[1]
<matplotlib.text.Text at 0x7f07874f2410>

章节作者：jesrl

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