在Python中生成具有複數點陣列的拉蓋爾多項式的範德蒙德矩陣


要生成拉蓋爾多項式的偽範德蒙德矩陣,請在Python NumPy中使用laguerre.lagvander()。此方法返回偽範德蒙德矩陣。返回矩陣的形狀為x.shape + (deg + 1,),其中最後一個索引是相應拉蓋爾多項式的階數。dtype將與轉換後的x相同。

引數x返回點陣列。dtype根據元素是否為複數轉換為float64或complex128。如果x是標量,則將其轉換為一維陣列。引數deg是結果矩陣的階數。

步驟

首先,匯入所需的庫:

import numpy as np
from numpy.polynomial import laguerre as L

建立一個數組:

x = np.array([-2.+2.j, -1.+2.j, 0.+2.j, 1.+2.j, 2.+2.j])

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)

要生成拉蓋爾多項式的偽範德蒙德矩陣,請在Python NumPy中使用laguerre.lagvander():

print("\nResult...\n",L.lagvander(x, 2))

示例

import numpy as np
from numpy.polynomial import laguerre as L

# Create an array
x = np.array([-2.+2.j, -1.+2.j, 0.+2.j, 1.+2.j, 2.+2.j])

# Display the array
print("Our Array...\n",x)

# Check the Dimensions
print("\nDimensions of our Array...\n",x.ndim)

# Get the Datatype
print("\nDatatype of our Array object...\n",x.dtype)

# Get the Shape
print("\nShape of our Array object...\n",x.shape)

# To generate a pseudo Vandermonde matrix of the Laguerre polynomial, use the laguerre.lagvander() in Python Numpy
# The method returns the pseudo-Vandermonde matrix. The shape of the returned matrix is x.shape + (deg + 1,), where The last index is the degree of the corresponding Laguerre polynomial. The dtype will be the same as the converted x.
print("\nResult...\n",L.lagvander(x, 2))

輸出

Our Array...
   [-2.+2.j -1.+2.j 0.+2.j 1.+2.j 2.+2.j]

Dimensions of our Array...
1

Datatype of our Array object...
complex128

Shape of our Array object...
(5,)

Result...
   [[ 1. +0.j 3. -2.j 5. -8.j]
   [ 1. +0.j 2. -2.j 1.5-6.j]
   [ 1. +0.j 1. -2.j -1. -4.j]
   [ 1. +0.j 0. -2.j -2.5-2.j]
   [ 1. +0.j -1. -2.j -3. +0.j]]

更新於:2022年3月4日

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