返回Python中一维勒让德多项式系数的缩放伴随矩阵
要返回一维勒让德多项式系数的缩放伴随矩阵,请在Python NumPy中使用legendre.legcompanion()方法。当c是拉盖尔多项式基时,勒让德多项式的普通伴随矩阵已经是对称的,因此不应用缩放。
返回维度为(deg, deg)的缩放伴随矩阵。参数c是一个从低到高阶排序的一维勒让德级数系数数组。
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)
检查维度:
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)
要返回一维勒让德多项式系数的缩放伴随矩阵,请在Python NumPy中使用legendre.legcompanion()方法。当c是拉盖尔多项式基时,勒让德多项式的普通伴随矩阵已经是对称的,因此不应用缩放:
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]]
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