Python matplotlib:添加圆圈以绘制
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时间:2020-08-18 11:07:10 来源:igfitidea点击:
matplotlib: add circle to plot
提问by Neil G
How do I add a small filled circle or point to a countour plot in matplotlib?
如何在 matplotlib 中添加一个小的实心圆或指向一个计数图?
采纳答案by unutbu
Here is an example, using pylab.Circle:
这是一个使用pylab.Circle的示例:
import numpy as np
import matplotlib.pyplot as plt
e = np.e
X, Y = np.meshgrid(np.linspace(0, 5, 100), np.linspace(0, 5, 100))
F = X ** Y
G = Y ** X
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
circ = plt.Circle((e, e), radius=0.07, color='g')
plt.contour(X, Y, (F - G), [0])
ax.add_patch(circ)
plt.show()


And here is another example(though not a contour plot) from the docs.
而这里是另一个例子,从文档(虽然不是等值线图)。
Or, you could just use plot:
或者,你可以只使用plot:
import numpy as np
import matplotlib.pyplot as plt
e = np.e
X, Y = np.meshgrid(np.linspace(0, 5, 100), np.linspace(0, 5, 100))
F = X ** Y
G = Y ** X
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
plt.contour(X, Y, (F - G), [0])
plt.plot([e], [e], 'g.', markersize=20.0)
plt.show()



