Python 中的 numpy.poly()
多项式根序列中的 numpy.poly() 函数返回多项式的系数。
语法: numpy.poly(seq)
参数: 序列:多项式根的根序列，或根矩阵。
返回:多项式系数从最高到最低的 1D 阵列。 c[0] x * (N)+c[1] x * (N-1)+…+c[N-1]* x+c[N]，其中 c[0]总是等于 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)
输出:
Coefficients of the polynomial: [ 1\. -3\. 2\. 0.]
Above polynomial =
3 2
1 x - 3 x + 2 x
代码#2:
# 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)
输出:
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
