獲取一維和二維陣列的內積
要獲取兩個陣列的內積,在 Python 中使用 numpy.inner() 方法。向量的一般內積是一維陣列,高維度中是對最後軸的和積。引數是 a 和 b,兩個向量。如果 a 和 b 為非標量,則它們的最後一個維度必須匹配。
步驟
首先,匯入所需的庫 −
import numpy as np
使用 array() 方法建立兩個 numpy 一維陣列 −
arr1 = np.arange(2).reshape((1,1,2)) arr2 = np.arange(6).reshape((3,2))
顯示陣列 −
print("Array1...\n",arr1) print("\nArray2...\n",arr2)
檢查兩個陣列的維度 −
print("\nDimensions of Array1...\n",arr1.ndim) print("\nDimensions of Array2...\n",arr2.ndim)
檢查兩個陣列的形狀 −
print("\nShape of Array1...\n",arr1.shape) print("\nShape of Array2...\n",arr2.shape)
要獲取兩個陣列的內積,請使用 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))
輸出
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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