numpy.poly() in Python (original) (raw)

Last Updated : 04 Dec, 2020

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 to the lowest one. c[0] * x**(N) + c[1] * x**(N-1) + ... + c[N-1] * x + c[N] where c[0] always equals 1.

Python3 1== `

Python code explaining

numpy.poly()

importing libraries

import numpy as np

Giving the roots

seq_1 = (2, 1, 0) a = np.poly(seq_1) print ("Coefficients of the polynomial: ", a)

Constructing polynomial

p1 = np.poly1d(a) print ("\nAbove polynomial = \n", p1)

`

Output :

Coefficients of the polynomial: [ 1. -3. 2. 0.]

Above polynomial = 3 2 1 x - 3 x + 2 x

Code #2:

Python3 `

Python code explaining

numpy.poly()

importing libraries

import numpy as np

Giving the roots

seq_2 = (2, 1, 0, 2, 4, 2) b = np.poly(seq_2) print ("Coefficients of the polynomial: ", b)

Constructing polynomial

p2 = np.poly1d(b) print ("\nAbove polynomial = \n", p2)

`

Output :

Coefficients of the polynomial: [ 1. -11. 46. -92. 88. -32. 0.]

Above polynomial = 6 5 4 3 2 1 x - 11 x + 46 x - 92 x + 88 x - 32 x