numpy.polyval() in Python

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()

 # 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) My Personal Notes arrow_drop_up Aspire to Inspire before I expire

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