numpy.polyval() in Python

numpy.polyval() in Python

Last Updated : 29 Nov, 2018

numpy.polyval(p, x) method evaluates a polynomial at specific values. If 'N' is the length of polynomial 'p', then this function returns the value

Parameters : 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'. Return: Evaluated value of polynomial.

Code : Python code explaining polyval()

Python3 1==

# 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)

Python3 1==

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

Python3 1==

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)

numpy.polyval() in Python

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