返回Python中一维Chebyshev级数系数的缩放伴随矩阵
要返回一维多项式系数数组的缩放伴随矩阵,请在Python Numpy中返回chebyshev.chebcompanion()方法。基多项式已缩放,以便当c是Chebyshev基多项式时,伴随矩阵是对称的。这比未缩放的情况提供了更好的特征值估计,并且对于基多项式,如果使用numpy.linalg.eigvalsh获得特征值,则保证特征值是实数。该方法返回维度为(deg, deg)的缩放伴随矩阵。参数c是从低到高阶排列的一维Chebyshev级数系数数组。
步骤
首先,导入所需的库:
import numpy as np from numpy.polynomial import chebyshev as C
创建一个一维系数数组:
c = np.array([1, 2, 3])
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)
要返回一维多项式系数数组的缩放伴随矩阵,请在Python Numpy中返回chebyshev.chebcompanion()方法:
print("\nResult...\n",C.chebcompanion(c))
示例
import numpy as np from numpy.polynomial import chebyshev as C # Create a 1D array of coefficients c = np.array([1, 2, 3]) # 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 polynomial coefficients, return the chebyshev.chebcompanion() method in Python Numpy print("\nResult...\n",C.chebcompanion(c))
输出
Our Array... [1 2 3] Dimensions of our Array... 1 Datatype of our Array object... int64 Shape of our Array object... (3,) Result... [[ 0. 0.47140452] [ 0.70710678 -0.33333333]]
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