Python numpy.polyder()

numpy.polyder()方法评估一个指定阶数的多项式的导数。

语法 : numpy.polyder(p, m)
参数 :
p :[array_like or poly1D]多项式系数按照幂的递减顺序给出。如果第二个参数（根）被设置为True，那么数组值就是多项式方程的根。

m :[int, optional] 差异化的顺序。

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)

Python中的numpy.polyder()

   
# Solve for x = 2 
print ("\n\np1 at x = 2 : ", p1(2)) 
print ("p2 at x = 2 : ", p2(2))

Python中的numpy.polyder()

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)

Python中的numpy.polyder()

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)