用深度為1的列表建立NumPy中的塊矩陣


要構建一個矩陣塊,請在Python Numpy中使用numpy.block()方法。這裡,我們將從深度為一的列表中構建。內部列表中的塊沿著最後一個維度(-1)進行級聯,然後沿著倒數第二個維度(-2)進行級聯,依此類推,直到達到最外層列表。

塊可以是任何維度的,但是不會使用正常規則進行廣播。相反,將插入大小為1的前導軸,以便使所有塊的block.ndim相同。這主要用於處理標量,這意味著程式碼(如np.block([v, 1]))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.array([49, 76, 61, 82, 69, 29])
arr2 = np.array([40, 60, 89, 55, 32, 98])

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)

要構建一個矩陣塊,請在Python Numpy中使用numpy.block()方法 -

print("
Result...
",np.block([arr1, arr2, 99]))

示例

import numpy as np

# Creating two numpy arrays using the array() method
# We have inserted elements of int type
arr1 = np.array([49, 76, 61, 82, 69, 29])
arr2 = np.array([40, 60, 89, 55, 32, 98])

# 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, arr2, 99]))

輸出

Array 1...
[49 76 61 82 69 29]

Array 2...
[40 60 89 55 32 98]

Our Array 1 type...
int64

Our Array 2 type...
int64

Our Array 1 Dimensions...
1

Our Array 2 Dimensions...
1

Our Array 1 Shape...
(6,)

Our Array 2 Shape...
(6,)

Result...
[49 76 61 82 69 29 40 60 89 55 32 98 99]

更新日期:2022-02-18

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