获取一维和二维数组的内积
要获取两个数组的内积,在 Python 中使用 numpy.inner() 方法。向量的一般内积是一维数组,高维度中是对最后轴的和积。参数是 a 和 b,两个向量。如果 a 和 b 为非标量,则它们的最后一个维度必须匹配。
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.arange(2).reshape((1,1,2)) arr2 = np.arange(6).reshape((3,2))
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)
要获取两个数组的内积,请使用 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.arange(2).reshape((1,1,2)) arr2 = np.arange(6).reshape((3,2)) # 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... [[[0 1]]] Array2... [[0 1] [2 3] [4 5]] Dimensions of Array1... 3 Dimensions of Array2... 2 Shape of Array1... (1, 1, 2) Shape of Array2... (3, 2) Result (Inner Product)... [[[1 3 5]]]
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