BK3_CH03_04代码无法输出图像

[gusang123]

姜博士您好，我在学习您的第三本书，在跑这个代码时，发现无法输出图像，想和您请教一下：

代码如下： import numpy as np import matplotlib.pyplot as plt

n_start = 6

B_6 = np.sin(np.pi/n_start)n_start A_6 = np.tan(np.pi/n_start)n_start

B_array = [] A_array = [] n_array = [6,12,24,48,96]

B_i = B_6 A_i = A_6 n_i = n_start

for i in n_array:

B_array.append(B_i)
A_array.append(A_i)

# updating
A_i = 2*A_i*B_i/(A_i + B_i)
B_i = np.sqrt(A_i*B_i)

B_array = np.array(B_array) A_array = np.array(A_array) n_array = np.array(n_array)

fig, ax = plt.subplots()

plt.axhline(y=np.pi, color='r', linestyle='-') plt.plot(n_array,B_array, color = 'b', marker = 'x') plt.plot(n_array,A_array, color = 'g', marker = 'x') plt.fill_between(n_array, B_array, A_array, color = '#DEEAF6') plt.tight_layout() plt.xticks([6,12,24,48,96]) plt.xlim((6,96)) plt.xlabel('Number of sides, n') plt.ylabel('Estimate of $\pi$')

盼回复，谢谢

[Visualize-ML]

我试了代码，没问题啊。是不是可以最后加一句 plt.show()

On Fri, Feb 2, 2024 at 3:21 AM gusang123 @.***> wrote:

姜博士您好，我在学习您的第三本书，在跑这个代码时，发现无法输出图像，想和您请教一下：

代码如下： import numpy as np import matplotlib.pyplot as plt

n_start = 6

B_6 = np.sin(np.pi/n_start)n_start A_6 = np.tan(np.pi/n_start)n_start

B_array = [] A_array = [] n_array = [6,12,24,48,96]

B_i = B_6 A_i = A_6 n_i = n_start

for i in n_array:

B_array.append(B_i) A_array.append(A_i)

updating

A_i = 2A_iB_i/(A_i + B_i) B_i = np.sqrt(A_i*B_i)

B_array = np.array(B_array) A_array = np.array(A_array) n_array = np.array(n_array)

fig, ax = plt.subplots()

plt.axhline(y=np.pi, color='r', linestyle='-') plt.plot(n_array,B_array, color = 'b', marker = 'x') plt.plot(n_array,A_array, color = 'g', marker = 'x') plt.fill_between(n_array, B_array, A_array, color = '#DEEAF6') plt.tight_layout() plt.xticks([6,12,24,48,96]) plt.xlim((6,96)) plt.xlabel('Number of sides, n') plt.ylabel('Estimate of $\pi$')

盼回复，谢谢

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