Python 使用 matplotlib 注释绘图
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annotate a plot using matplotlib
提问by Helen Firs
I am using this to making a plot with contains in specific moment something such as highlight
我正在使用它来制作包含特定时刻的情节,例如突出显示
plt.axis('normal')
plt.axvspan(76, 76, facecolor='g', alpha=1)
plt.plot(ts.e1, 'r',linewidth=1.5)
plt.ylabel("Anger",fontsize=14,color='blue')
plt.ylim(ymax=0.04)
plt.xlim(xmax=122)
plt.grid(True)
plt.title("Anger - Real Events", fontsize=20,color='black')
plt.xlabel('minutes', fontsize=14, color='b')
plt.show()
Is there any idea if i could add horizontal text like 'span 1' in this:
有什么想法我可以在这个中添加像“span 1”这样的水平文本:
plt.axvspan(76, 76, facecolor='g', alpha=1)
or using the text 'line1' and have a arrow to show in this span?
或者使用文本“line1”并在此跨度中显示一个箭头?
回答by alecxe
Here's how you can have an arrow showing to the span:
以下是显示跨度的箭头的方法:
import matplotlib.pyplot as plt
plt.axvspan(76, 76, facecolor='g', alpha=1)
plt.annotate('This is awesome!',
xy=(76, 0.75),
xycoords='data',
textcoords='offset points',
arrowprops=dict(arrowstyle="->"))
plt.show()
For more info about annotate see docs.
有关注释的更多信息,请参阅文档。
The output of the above code:

上面代码的输出:


