Python：（使用matplotlib畫圖）在座標圖中進行註釋：如添加箭頭，添加文本等

先上個圖 import matplotlib.pyplot as plt import numpy as np x = np.linspace(-5,5,100) y1 = 2 * x + 1 # y2 = x**2 plt.figure(num=3,figsize=(9,6)) # line_1 = plt.plot(x,y2,label='up') line_2 = plt.plot(x

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