numpy.poly() in Python
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.
import numpy as np
seq_1 = (2, 1, 0)
a = np.poly(seq_1)
print ("Coefficients of the polynomial: ", a)
p1 = np.poly1d(a)
print ("\nAbove polynomial = \n", p1)
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Output :
Coefficients of the polynomial: [ 1. -3. 2. 0.]
Above polynomial =
3 2
1 x - 3 x + 2 x
Code #2:
import numpy as np
seq_2 = (2, 1, 0, 2, 4, 2)
b = np.poly(seq_2)
print ("Coefficients of the polynomial: ", b)
p2 = np.poly1d(b)
print ("\nAbove polynomial = \n", p2)
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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
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