在 NumPy 中構建一個塊矩陣
要在 Python Numpy 中構建矩陣塊,請使用 numpy.block() 方法。最內層列表中的塊沿著最後一個維度(-1)連線,然後沿著倒數第二個維度(-2)連線,依此類推,直到到達最外層列表。
塊可以是任何維度,但不會使用正常規則進行廣播。相反,會插入大小為 1 的前導軸,以使各個塊的 block.ndim 相同。這主要用於處理標量,這意味著像 np.block([v, 1]) 這樣的程式碼是有效的,其中 v.ndim == 1。
步驟
首先,匯入所需的庫 -
import numpy as np
使用 array() 方法建立兩個 numpy 陣列。我們插入了 int 型別的元素-
arr1 = np.eye(2) * 2 arr2 = np.eye(3) * 2
顯示陣列 -
print("Array 1...
", arr1) print("
Array 2...
", arr2)
獲取陣列的型別 -
print("
Our Array 1 type...
", arr1.dtype) print("
Our Array 2 type...
", arr2.dtype)
獲取陣列的維度 -
print("
Our Array 1 Dimensions...
",arr1.ndim) print("
Our Array 2 Dimensions...
",arr2.ndim)
獲取陣列的形狀 -
print("
Our Array 1 Shape...
",arr1.shape) print("
Our Array 2 Shape...
",arr2.shape)
要在 Python Numpy 中構建矩陣塊,請使用 numpy.block() 方法 -
print("
Result...
",np.block([[arr1,np.zeros((2, 3))], [np.ones((3, 2)), arr2]]))
程式碼示例
import numpy as np # Creating two numpy arrays using the array() method # We have inserted elements of int type arr1 = np.eye(2) * 2 arr2 = np.eye(3) * 2 # Display the arrays print("Array 1...
", arr1) print("
Array 2...
", arr2) # Get the type of the arrays print("
Our Array 1 type...
", arr1.dtype) print("
Our Array 2 type...
", arr2.dtype) # Get the dimensions of the Arrays print("
Our Array 1 Dimensions...
",arr1.ndim) print("
Our Array 2 Dimensions...
",arr2.ndim) # Get the shape of the Arrays print("
Our Array 1 Shape...
",arr1.shape) print("
Our Array 2 Shape...
",arr2.shape) # To build a block of matrix, use the numpy.block() method in Python Numpy print("
Result...
",np.block([[arr1,np.zeros((2, 3))], [np.ones((3, 2)), arr2]]))
輸出
Array 1... [[2. 0.] [0. 2.]] Array 2... [[2. 0. 0.] [0. 2. 0.] [0. 0. 2.]] Our Array 1 type... float64 Our Array 2 type... float64 Our Array 1 Dimensions... 2 Our Array 2 Dimensions... 2 Our Array 1 Shape... (2, 2) Our Array 2 Shape... (3, 3) Result... [[2. 0. 0. 0. 0.] [0. 2. 0. 0. 0.] [1. 1. 2. 0. 0.] [1. 1. 0. 2. 0.] [1. 1. 0. 0. 2.]]
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