matplotlib & pandas

Python/matplotlab/gallery/units/units_scatter.md

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+# 单位处理
+
+下面的示例显示了对掩码数组的单位转换的支持。
+
+此示例需要[basic_units.py](https://matplotlib.org/_downloads/3a73b4cd6e12aa53ff277b1b80d631c1/basic_units.py)
+
+![单位处理示例](https://matplotlib.org/_images/sphx_glr_units_scatter_001.png)
+
+```python
+import numpy as np
+import matplotlib.pyplot as plt
+from basic_units import secs, hertz, minutes
+
+# create masked array
+data = (1, 2, 3, 4, 5, 6, 7, 8)
+mask = (1, 0, 1, 0, 0, 0, 1, 0)
+xsecs = secs * np.ma.MaskedArray(data, mask, float)
+
+fig, (ax1, ax2, ax3) = plt.subplots(nrows=3, sharex=True)
+ax1.scatter(xsecs, xsecs)
+ax1.yaxis.set_units(secs)
+ax1.axis([0, 10, 0, 10])
+
+ax2.scatter(xsecs, xsecs, yunits=hertz)
+ax2.axis([0, 10, 0, 1])
+
+ax3.scatter(xsecs, xsecs, yunits=hertz)
+ax3.yaxis.set_units(minutes)
+ax3.axis([0, 10, 0, 1])
+
+fig.tight_layout()
+plt.show()
+```
+
+## 下载这个示例
+            
+- [下载python源码: units_scatter.py](https://matplotlib.org/_downloads/units_scatter.py)
+- [下载Jupyter notebook: units_scatter.ipynb](https://matplotlib.org/_downloads/units_scatter.ipynb)