英寸和厘米
该示例说明了使用绘图函数的xunits和yunits参数将默认x和y单位（ax1）覆盖为英寸和厘米的功能。 请注意，应用转换以获取正确单位的数字。
此示例需要basic_units.py
from basic_units import cm, inch
import matplotlib.pyplot as plt
import numpy as np
cms = cm * np.arange(0, 10, 2)
fig, axs = plt.subplots(2, 2)
axs[0, 0].plot(cms, cms)
axs[0, 1].plot(cms, cms, xunits=cm, yunits=inch)
axs[1, 0].plot(cms, cms, xunits=inch, yunits=cm)
axs[1, 0].set_xlim(3, 6) # scalars are interpreted in current units
axs[1, 1].plot(cms, cms, xunits=inch, yunits=inch)
axs[1, 1].set_xlim(3*cm, 6*cm) # cm are converted to inches
plt.show()