在 Python 中查找两个数组的外积

如需查找两个数组的外积，请在 Python 中使用 numpy.outer() 方法。第一个参数 a 是第一个输入向量。如果输入尚未为一维，会将其展平。第二个参数 b 是第二个输入向量。如果输入尚未为一维，会将其展平。第三个参数 out 是存储结果的位置。

给定两个向量，a = [a0, a1, ..., aM] 和 b = [b0, b1, ..., bN]，其外积 [1] 为 −

[[a0*b0 a0*b1 ... a0*bN ]
[a1*b0 .
[ ... .
[aM*b0 aM*bN ]]

步骤

首先，导入所需的库 -

import numpy as np

使用 array() 方法创建两个 NumPy 一维数组 -

arr1 = np.array([5, 10, 15])
arr2 = np.array([20, 25, 30])

显示数组 -

print("Array1...\n",arr1)
print("\nArray2...\n",arr2)

检查这两个数组的维度 -

print("\nDimensions of Array1...\n",arr1.ndim)
print("\nDimensions of Array2...\n",arr2.ndim)

检查两个数组的形状 -

print("\nShape of Array1...\n",arr1.shape)
print("\nShape of Array2...\n",arr2.shape)

如需查找两个数组的外积，请在 Python 中使用 numpy.outer() 方法 -

print("\nResult (Outer Product)...\n",np.outer(arr1, arr2))

示例

import numpy as np

# Creating two numpy One-Dimensional array using the array() method
arr1 = np.array([5, 10, 15])
arr2 = np.array([20, 25, 30])

# Display the arrays
print("Array1...\n",arr1)
print("\nArray2...\n",arr2)

# Check the Dimensions of both the arrays
print("\nDimensions of Array1...\n",arr1.ndim)
print("\nDimensions of Array2...\n",arr2.ndim)

# Check the Shape of both the arrays
print("\nShape of Array1...\n",arr1.shape)
print("\nShape of Array2...\n",arr2.shape)

# To get the Outer product of two arrays, use the numpy.outer() method in Python
print("\nResult (Outer Product)...\n",np.outer(arr1, arr2))

输出

Array1...
[ 5 10 15]

Array2...
[20 25 30]

Dimensions of Array1...
1

Dimensions of Array2...
1

Shape of Array1...
(3,)

Shape of Array2...
(3,)

Result (Outer Product)...
[[100 125 150]
[200 250 300]
[300 375 450]]

更新时间：2022-02-25

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