返回Python中一維Chebyshev級數係數的縮放伴隨矩陣
要返回一維多項式係數陣列的縮放伴隨矩陣,請在Python Numpy中返回chebyshev.chebcompanion()方法。基多項式已縮放,以便當c是Chebyshev基多項式時,伴隨矩陣是對稱的。這比未縮放的情況提供了更好的特徵值估計,並且對於基多項式,如果使用numpy.linalg.eigvalsh獲得特徵值,則保證特徵值是實數。該方法返回維度為(deg, deg)的縮放伴隨矩陣。引數c是從低到高階排列的一維Chebyshev級數係數陣列。
步驟
首先,匯入所需的庫:
import numpy as np from numpy.polynomial import chebyshev as C
建立一個一維繫數陣列:
c = np.array([1, 2, 3])
顯示陣列:
print("Our Array...\n",c)檢查維度:
print("\nDimensions of our Array...\n",c.ndim)獲取資料型別:
print("\nDatatype of our Array object...\n",c.dtype)獲取形狀:
print("\nShape of our Array object...\n",c.shape)要返回一維多項式係數陣列的縮放伴隨矩陣,請在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))輸出
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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