python 中的 numpy.polyder()
numpy.polyder() 方法计算指定阶数的多项式的导数。
语法: numpy.polyder(p，m) 参数: p:【array _ like 或 poly1D】多项式系数按幂的递减顺序给出。如果第二个参数(根)设置为真，那么数组值就是多项式方程的根。 例如: poly1d(3，2，6) = 3x 2 + 2x + 6
m:【int，可选】微分顺序。
返回:多项式的导数。
代码:解释 polyder()的 Python 代码
# Python code explaining
# numpy.polyder()
# importing libraries
import numpy as np
import pandas as pd
# Constructing polynomial
p1 = np.poly1d([1, 2])
p2 = np.poly1d([4, 9, 5, 4])
print ("P1 : ", p1)
print ("\n p2 : \n", p2)
# Solve for x = 2
print ("\n\np1 at x = 2 : ", p1(2))
print ("p2 at x = 2 : ", p2(2))
a = np.polyder(p1, 1)
b = np.polyder(p2, 1)
print ("\n\nUsing polyder")
print ("p1 derivative of order = 1 : \n", a)
print ("p2 derivative of order = 1 : \n", b)
a = np.polyder(p1, 2)
b = np.polyder(p2, 2)
print ("\n\nUsing polyder")
print ("p1 derivative of order = 2 : ", a)
print ("p2 derivative of order = 2 : ", b)
