在Python中使用複數點座標生成Hermite_e多項式的偽範德蒙德矩陣


要生成Hermite_e多項式的偽範德蒙德矩陣,請在Python NumPy中使用hermite_e.hermevander2d()。該方法返回偽範德蒙德矩陣。引數x,y是點座標陣列,形狀相同。資料型別將轉換為float64或complex128,具體取決於是否存在複數元素。標量將轉換為一維陣列。引數deg是最大次數列表,格式為[x_deg, y_deg]。

步驟

首先,匯入所需的庫:

import numpy as np
from numpy.polynomial import hermite as H

使用numpy.array()方法建立形狀相同的點座標陣列:

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

顯示陣列:

print("Array1...\n",x)
print("\nArray2...\n",y)

顯示資料型別:

print("\nArray1 datatype...\n",x.dtype)
print("\nArray2 datatype...\n",y.dtype)

檢查兩個陣列的維度:

print("\nDimensions of Array1...\n",x.ndim)
print("\nDimensions of Array2...\n",y.ndim)

檢查兩個陣列的形狀:

print("\nShape of Array1...\n",x.shape)
print("\nShape of Array2...\n",y.shape)

要生成Hermite_e多項式的偽範德蒙德矩陣,請在Python NumPy中使用hermite_e.hermevander2d():

x_deg, y_deg = 2, 3
print("\nResult...\n",H.hermevander2d(x,y, [x_deg, y_deg]))

示例

import numpy as np
from numpy.polynomial import hermite_e as H

# Create arrays of point coordinates, all of the same shape using the numpy.array() method
x = np.array([-2.+2.j, -1.+2.j])
y = np.array([1.+2.j, 2.+2.j])

# Display the arrays
print("Array1...\n",x)
print("\nArray2...\n",y)

# Display the datatype
print("\nArray1 datatype...\n",x.dtype)
print("\nArray2 datatype...\n",y.dtype)

# Check the Dimensions of both the array
print("\nDimensions of Array1...\n",x.ndim)
print("\nDimensions of Array2...\n",y.ndim)

# Check the Shape of both the array
print("\nShape of Array1...\n",x.shape)
print("\nShape of Array2...\n",y.shape)

# To generate a pseudo Vandermonde matrix of the Hermite_e polynomial, use the hermite_e.hermevander2d() in Python Numpy
# The method returns the pseudo-Vandermonde matrix.

x_deg, y_deg = 2, 3
print("\nResult...\n",H.hermevander2d(x,y, [x_deg, y_deg]))

輸出

Array1...
   [-2.+2.j -1.+2.j]

Array2...
   [1.+2.j 2.+2.j]

Array1 datatype...
complex128

Array2 datatype...
complex128

Dimensions of Array1...
1

Dimensions of Array2...
1

Shape of Array1...
(2,)

Shape of Array2...
(2,)

Result...
   [[ 1. +0.j  1.  +2.j  -4. +4.j -14. -8.j  -2. +2.j  -6. -2.j
     0. -16.j  44. -12.j -1. -8.j  15. -10.j 36. +28.j -50.+120.j]
   [ 1.  +0.j  2.  +2.j  -1. +8.j -22. +10.j -1. +2.j  -6.  +2.j
   -15. -10.j  2. -54.j  -4. -4.j  0. -16.j  36. -28.j 128. +48.j]]

更新於:2022年3月7日

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