Python Numpy/Chebyshev模块：获取值

我已经建立了一个基于给定值的切比雪夫多项式

x = [1000,1001,1002,1003,1004,1005,1006,1007,1008]
y = [121.093,121.092,121.091,121.090,121.090,121.089,121.084,121.079,121.081]
from numpy.polynomial import Chebyshev as T
p = T.fit(x, y, 2)
xx, yy = p.linspace(n=10)
plt.plot(xx, yy)
plt.plot(x, y)

现在我需要得到给定X的切比雪夫多项式的Y值

121.079109091

但我的数据中的第一个“Y”是“121.093”。好的，让我们试试“1000”：

-2898.698090887721

问题

当“X”=1000时，如何获得“Y”值？我希望得到“121.093”

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调用Chebyshev.fit（）时缺少关键字窗口。请看下面的代码片段

import numpy.polynomial.chebyshev as cheb
x = [1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008]
y = [121.093, 121.092, 121.091, 121.090, 121.090, 121.089, 121.084, 121.079,
     121.081]
p = cheb.Chebyshev.fit(x, y, 2, window=[1000, 1008])
print(cheb.chebval(1000, p.coef))
# 121.09270909090891

---

调用Chebyshev.fit（）时缺少关键字窗口。请看下面的代码片段

import numpy.polynomial.chebyshev as cheb
x = [1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008]
y = [121.093, 121.092, 121.091, 121.090, 121.090, 121.089, 121.084, 121.079,
     121.081]
p = cheb.Chebyshev.fit(x, y, 2, window=[1000, 1008])
print(cheb.chebval(1000, p.coef))
# 121.09270909090891

import numpy.polynomial.chebyshev as cheb
x = [1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008]
y = [121.093, 121.092, 121.091, 121.090, 121.090, 121.089, 121.084, 121.079,
     121.081]
p = cheb.Chebyshev.fit(x, y, 2, window=[1000, 1008])
print(cheb.chebval(1000, p.coef))
# 121.09270909090891