使用 Python 获取两个一维数组的外积
要获取两个一维数组的外积,在 Python 中使用 numpy.outer() 方法。
第一个参数 a 是第一个输入向量。如果输入不是 1 维的,则会被扁平化。第二个参数 b 是第二个输入向量。如果输入不是 1 维的,则会被扁平化。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],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的一维数组:
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)
要获取两个一维数组的外积,请在Python中使用numpy.outer()方法。 第一个参数a是第一个输入向量。如果输入不是一维的,将其扁平化。第二个参数b是第二个输入向量。如果输入不是一维的,将其扁平化。第三个参数out是结果存储的位置−
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 One-Dimensional 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]]
极客笔记