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51 lines
1.2 KiB
Markdown
51 lines
1.2 KiB
Markdown
# 对数演示
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具有对数轴的图的示例。
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```python
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import numpy as np
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import matplotlib.pyplot as plt
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# Data for plotting
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t = np.arange(0.01, 20.0, 0.01)
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# Create figure
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fig, ((ax1, ax2), (ax3, ax4)) = plt.subplots(2, 2)
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# log y axis
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ax1.semilogy(t, np.exp(-t / 5.0))
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ax1.set(title='semilogy')
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ax1.grid()
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# log x axis
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ax2.semilogx(t, np.sin(2 * np.pi * t))
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ax2.set(title='semilogx')
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ax2.grid()
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# log x and y axis
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ax3.loglog(t, 20 * np.exp(-t / 10.0), basex=2)
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ax3.set(title='loglog base 2 on x')
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ax3.grid()
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# With errorbars: clip non-positive values
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# Use new data for plotting
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x = 10.0**np.linspace(0.0, 2.0, 20)
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y = x**2.0
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ax4.set_xscale("log", nonposx='clip')
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ax4.set_yscale("log", nonposy='clip')
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ax4.set(title='Errorbars go negative')
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ax4.errorbar(x, y, xerr=0.1 * x, yerr=5.0 + 0.75 * y)
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# ylim must be set after errorbar to allow errorbar to autoscale limits
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ax4.set_ylim(bottom=0.1)
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fig.tight_layout()
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plt.show()
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```
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## 下载这个示例
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- [下载python源码: log_demo.py](https://matplotlib.org/_downloads/log_demo.py)
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- [下载Jupyter notebook: log_demo.ipynb](https://matplotlib.org/_downloads/log_demo.ipynb) |