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import numpy as np
import matplotlib.pyplot as plt
def poly_fit(x_values, y_values, degree=60):
# 使用 numpy 的 polyfit 函数进行多项式拟合
coefficients = np.polyfit(x_values, y_values, degree)
# 生成拟合的多项式函数
fitted_curve = np.poly1d(coefficients)
return fitted_curve(x_values)
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