返回一维Legendre多项式系数的缩放伴随矩阵
要返回一维Legendre多项式系数的缩放伴随矩阵,请在Python的Numpy中使用legendre.legcompanion()方法。当c是Laguerre多项式的基础时,Legendre多项式的通常伴随矩阵已经是对称的,因此不需要进行缩放。
返回维度为(deg, deg)的缩放伴随矩阵。参数c是按低到高度排序的一维Legendre级数系数数组。
步骤
首先,导入所需的库−
import numpy as np
from numpy.polynomial import legendre as L
创建一个一维系数数组 −
c = np.array([1, 2, 3, 4, 5])
显示数组 –
print("Our Array...\n",c)
检查尺寸 –
print("\nDimensions of our Array...\n",c.ndim)
获取数据类型 −
print("\nDatatype of our Array object...\n",c.dtype)
获取形状 −
print("\nShape of our Array object...\n",c.shape)
使用Python Numpy中的 legendre.legcompanion() 方法,可以将1-D数组的Legendre多项式系数返回为缩放的伴随矩阵。当c是基础的Laguerre多项式时,Legendre多项式的通常伴随矩阵已经是对称的,因此不需要进行缩放。
print("\nResult...\n",L.legcompanion(c))
示例
import numpy as np
from numpy.polynomial import legendre as L
# Create a 1D array of coefficients
c = np.array([1, 2, 3, 4, 5])
# Display the array
print("Our Array...\n",c)
# Check the Dimensions
print("\nDimensions of our Array...\n",c.ndim)
# Get the Datatype
print("\nDatatype of our Array object...\n",c.dtype)
# Get the Shape
print("\nShape of our Array object...\n",c.shape)
# To return the scaled companion matrix of a 1-D array of Legendre polynomial coefficients, use the legendre.legcompanion() method in Python Numpy
print("\nResult...\n",L.legcompanion(c))
输出
Our Array...
[1 2 3 4 5]
Dimensions of our Array...
1
Datatype of our Array object...
int64
Shape of our Array object...
(5,)
Result...
[[ 0. 0.57735027 0. -0.30237158]
[ 0.57735027 0. 0.51639778 -0.34914862]
[ 0. 0.51639778 0. 0.10141851]
[ 0. 0. 0.50709255 -0.45714286]]