numpy.polyval() in Python Last Updated : 29 Nov, 2018 Summarize Comments Improve Suggest changes Share Like Article Like Report 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) Comment More infoAdvertise with us Next Article numpy.poly() in Python M mohit gupta_omg :) Follow Improve Article Tags : Python Python-numpy Python numpy-polynomials Practice Tags : python Similar Reads numpy.poly() in Python The numpy.poly() function in the Sequence of roots of the polynomial returns the coefficient of the polynomial. Syntax :numpy.poly(seq) Parameters : Seq : sequence of roots of the polynomial roots, or a matrix of roots. Return: 1D array having coefficients of the polynomial from the highest degree t 2 min read numpy.polydiv() in Python The numpy.polydiv() method evaluates the division of two polynomials and returns the quotient and remainder of the polynomial division. Syntax : numpy.polydiv(p1, p2) Parameters : p1 : [array_like or poly1D]Coefficients of dividend polynomial. p2 : [array_like or poly1D]Coefficients of divisor polyn 1 min read numpy.polymul() in Python The numpy.polymul() method evaluates the product of two polynomials and returns the polynomial resulting from the multiplication of two input polynomials 'p1' and 'p2'. Syntax : numpy.polymul(p1, p2) Parameters : p1 : [array_like or poly1D]Input polynomial 1. p2 : [array_like or poly1D]Input polynom 1 min read numpy.polyadd() in Python numpy.polyadd() : This function helps to find the sum of two polynomials and then returning the result as a polynomial. Each input polynomial must be a sequence of polynomial coefficients, from highest to lowest degree. Parameters : p1 : Input polynomial 1 p2 : Input polynomial 2 Return : Sum of pol 1 min read numpy.poly1d() in Python The numpy.poly1d() function helps to define a polynomial function. It makes it easy to apply "natural operations" on polynomials. Syntax: numpy.poly1d(arr, root, var) Parameters : arr : [array_like] The polynomial coefficients are given in decreasing order of powers. If the second parameter (root) i 3 min read numpy.polyint() in Python numpy.polyint(p, m) : Evaluates the anti - derivative of a polynomial with the specified order. m antiderivative 'P' of polynomial 'p' satisfies 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 2 min read Like