获取 Python 中两个一维数组的内积
若要获取两个数组的内积,在 Python 中使用 numpy.inner() 方法。对于一维数组,向量的普通内积;在高维度中,对最后一个轴执行总和积。参数为两个向量 a 和 b。如果 a 和 b 是非标量,它们的最后一个维度必须匹配。
步骤
首先,导入必要的库。
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)
若要获取两个数组的内积,在 Python 中使用 numpy.inner() 方法。
print("\nResult (Inner Product)...\n",np.inner(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 Inner product of two arrays, use the numpy.inner() method in Python # Ordinary inner product of vectors for 1-D arrays, in higher dimensions a sum product over the last axes. print("\nResult (Inner Product)...\n",np.inner(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 (Inner Product)... 800
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