返回Python中两个多维向量的点积
要返回两个多维向量的点积,请在Python中使用numpy.vdot()方法。vdot(a, b)函数处理复数的方式与dot(a, b)不同。如果第一个参数是复数,则在计算点积时使用第一个参数的复共轭。vdot处理多维数组的方式与dot不同:它不会执行矩阵乘积,而是首先将输入参数展平为一维向量。因此,它应该只用于向量。
该方法返回a和b的点积。根据a和b的类型,可以是整数、浮点数或复数。第一个参数是a。如果a是复数,则在计算点积之前取其复共轭。b是点积的第二个参数。
步骤
首先,导入所需的库:
import numpy as np
使用array()方法创建两个NumPy多维数组:
arr1 = np.array([[5, 10],[15, 20]]) arr2 = np.array([[3, 6],[9, 12]])
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)
要返回两个多维向量的点积,请在Python中使用numpy.vdot()方法:
print("\nResult...\n",np.vdot(arr1, arr2))
示例
import numpy as np # Creating two numpy Multi-Dimensional array using the array() method arr1 = np.array([[5, 10],[15, 20]]) arr2 = np.array([[3, 6],[9, 12]]) # 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 return the dot product of two multi-dimensional vectors, use the numpy.vdot() method in Python. print("\nResult...\n",np.vdot(arr1, arr2))
输出
Array1... [[ 5 10] [15 20]] Array2... [[ 3 6] [ 9 12]] Dimensions of Array1... 2 Dimensions of Array2... 2 Shape of Array1... (2, 2) Shape of Array2... (2, 2) Result... 450
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