matplotlib & pandas

Python/matplotlab/gallery/units/bar_demo2.md

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+# 单位条形图
+
+使用各种厘米和英寸转换的图像。此示例显示默认单位内省如何工作（ax1），如何使用各种关键字来设置x和y单位以覆盖默认值（ax2，ax3，ax4）以及如何使用标量设置xlimits（ax3，当前单位） 假设）或单位（用于将数字转换为当前单位的转换）。
+
+此示例需要 [basic_units.py](https://matplotlib.org/_downloads/3a73b4cd6e12aa53ff277b1b80d631c1/basic_units.py)
+
+
+![单位条形图示例](https://matplotlib.org/_images/sphx_glr_bar_demo2_001.png)
+
+```python
+import numpy as np
+from basic_units import cm, inch
+import matplotlib.pyplot as plt
+
+cms = cm * np.arange(0, 10, 2)
+bottom = 0 * cm
+width = 0.8 * cm
+
+fig, axs = plt.subplots(2, 2)
+
+axs[0, 0].bar(cms, cms, bottom=bottom)
+
+axs[0, 1].bar(cms, cms, bottom=bottom, width=width, xunits=cm, yunits=inch)
+
+axs[1, 0].bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=cm)
+axs[1, 0].set_xlim(2, 6)  # scalars are interpreted in current units
+
+axs[1, 1].bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=inch)
+axs[1, 1].set_xlim(2 * cm, 6 * cm)  # cm are converted to inches
+
+fig.tight_layout()
+plt.show()
+```
+
+## 下载这个示例
+            
+- [下载python源码: bar_demo2.py](https://matplotlib.org/_downloads/bar_demo2.py)
+- [下载Jupyter notebook: bar_demo2.ipynb](https://matplotlib.org/_downloads/bar_demo2.ipynb)