numpy.polyval(p，x)方法以特定值評估多項式。
如果“ N”是多項式“ p”的長度，則此函數返回值
參數：
p:[array_like or poly1D] polynomial coefficients are given in decreasing order of powers. If the second parameter (root) is set to True then array values are the roots of the polynomial equation.
For example:poly1d(3, 2, 6) = 3x2 + 2x + 6
x:[array_like or poly1D] A number, an array of numbers, for evaluating ‘p’.
返回：Evaluated value of polynomial.
代碼：解釋polyval()的Python代碼
# Python code explaining
# numpy.polyval()
# 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.polyval([1, 2], 2)
b = np.polyval([4, 9, 5, 4], 2)
print ("\n\nUsing polyval")
print ("p1 at x = 2:", a)
print ("p2 at x = 2:", b)
c = np.polyval(np.poly1d([4, 9, 5, 4]), np.poly1d(2))
print ("\nc:", c)
相關用法
注：本文由純淨天空篩選整理自Mohit Gupta_OMG 大神的英文原創作品 numpy.polyval() in Python。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。