Python | Numpy np.polyfromroots() method Last Updated : 31 Dec, 2019 Comments Improve Suggest changes Like Article Like Report np.polyfromroots() method is used to generate a polynomial series with given roots. Syntax : np.polyfromroots(roots) Parameters: roots :[array_like] Input sequence containing the roots. Return : [ndarray] 1-D array of coefficients of polynomial series. Code #1 : Python3 # Python program explaining # numpy.polyfromroots() method # importing numpy as np # and numpy.polynomial.polynomial module as geek import numpy as np import numpy.polynomial.polynomial as geek # Input roots roots = (2, 4, 8) # using np.polyfromroots() method res = geek.polyfromroots(roots) # Resulting polynomial series coefficient print (res) Output: [-64. 56. -14. 1.] Code #2 : Python3 # Python program explaining # numpy.polyfromroots() method # importing numpy as np # and numpy.polynomial.polynomial module as geek import numpy as np import numpy.polynomial.polynomial as geek # Input roots s = (1, 2, 3, 4, 5) # using np.polyfromroots() method res = geek.polyfromroots(s) # Resulting polynomial series coefficient print (res) Output: [-120. 274. -225. 85. -15. 1.] Comment More infoAdvertise with us Next Article Python | Numpy np.polyfromroots() method jana_sayantan Follow Improve Article Tags : Python Python-numpy Python numpy-Mathematical Function Practice Tags : python Similar Reads Python | Numpy np.polyroots() method np.polyroots() method is used to compute the roots of a polynomial series.Return the roots of the polynomial. Syntax : np.polyroots(c) Parameters: c :[array_like] 1-D arrays of polynomial series coefficients. Return : [ndarray] Array of the roots of the series. If all the roots are real, then out is 1 min read Python | Numpy np.polyzero() method np.polyzero() method can be used instead of np.zeros for creating a array whose elements are 0. Syntax : np.polyzero() Return : Return array([0]) Example #1 : Python3 1=1 # Python program explaining # numpy.polyzero() method # import numpy and polyzero import numpy as np from numpy.polynomial.polyno 1 min read Python | Numpy np.polyone() method np.polyone() method can be used instead of np.ones for creating a array whose elements are 1. Syntax : np.polyone() Return : Return array([1]) Example #1 : Python3 1=1 # Python program explaining # numpy.polyone() method # import numpy and polyone import numpy as np from numpy.polynomial.polynomial 1 min read Python | Numpy np.poly2herm() method With the help of np.poly2herm() method, we can get the hermite series coefficient from polynomial by using np.poly2herm() method. Syntax : np.poly2herm(polynomial) Return : Return the coefficient of hermite series. Example #1 : In this example we can see that by using np.poly2herm() method, we are a 1 min read Python | Numpy np.polydomain() method With the help of np.polydomain() method, we can get the filter having value array([-1, 1]) in polynomial series. Syntax : np.polydomain Return : Return filter of array([-1, 1]) Example #1 : Python3 1=1 # Python program explaining # numpy.polydomain() method # import numpy and polydomain import numpy 1 min read Python | Numpy np.poly2herme() method With the help of np.poly2herme() method, we can get the hermiteE series from polynomial by using np.poly2herme() method. Syntax : np.poly2herme(series) Return : Return the coefficients of hermiteE series. Example #1 : In this example we can see that by using np.poly2herme() method, we are able to ge 1 min read Python | Numpy np.polyvander() method np.polyvander() method is used to returns the Vandermonde matrix of degree deg and sample points x. Syntax : np.polyvander(x, deg) Parameters: x :[ array_like ] Array of points. The dtype is converted to float64 or complex128 depending on whether any of the elements are complex. If x is scalar it is 1 min read Python | Numpy np.polygrid2d() method np.polygrid2d() method is used to evaluate a 2-D polynomial series on the Cartesian product of x and y. Syntax : np.polygrid2d(x, y, c) Parameters: x, y :[array_like]The two dimensional series is evaluated at the points in the Cartesian product of x and y. If x or y is a list or tuple, it is first c 2 min read Python | Numpy np.polygrid3d() method np.polygrid3d() method is used to evaluate a 3-D polynomial series on the Cartesian product of x, y and z. Syntax : np.polygrid3d(x, y, z, c) Parameters: x, y, z :[array_like]The three dimensional series is evaluated at the points in the Cartesian product of x, y and z. If x or y or z is a list or t 2 min read Python | Numpy np.poly2lag() method With the help of np.poly2lag() method, we can get the laguerre series coefficient from a given polynomial. Syntax : np.poly2lag(polynomial) Return : Return the coefficient of laguerre series. Example #1 : In this example we can see that by using np.poly2lag() method, we are able to get the coefficie 1 min read Like