判斷NumPy中兩個陣列的所有元素是否相等


要判斷兩個陣列的所有元素是否相等,可以使用Python NumPy中的**ma.allequal()**方法。如果兩個陣列在給定的容差範圍內相等,則返回True,否則返回False。如果任一陣列包含NaN,則返回False。

fill_value 設定a或b中的掩碼值是否被認為相等(True)或不相等(False)。掩碼陣列是標準numpy.ndarray和掩碼的組合。掩碼是nomask(表示關聯陣列的任何值均有效)或布林陣列(確定關聯陣列的每個元素的值是否有效)。

步驟

首先,匯入所需的庫:

import numpy as np

建立一個3x3的陣列,使用numpy.arange()方法建立包含整數元素的陣列:

arr1 = np.arange(9).reshape((3,3))
print("Array1...
", arr1) print("
Array type...
", arr1.dtype)

建立掩碼陣列1:

arr1 = ma.array(arr1)

掩碼陣列1:

arr1[0, 1] = ma.masked
arr1[1, 1] = ma.masked

顯示掩碼陣列1:

print("
Masked Array1...
",arr1)

建立另一個3x3的陣列,使用numpy.arange()方法建立包含整數元素的陣列:

arr2 = np.arange(9).reshape((3,3))
print("
Array2...
", arr2) print("
Array type...
", arr2.dtype)

建立另一個掩碼陣列2:

arr2 = ma.array(arr2)

掩碼陣列2:

arr2[2, 1] = ma.masked
arr2[2, 2] = ma.masked

顯示掩碼陣列2:

print("
Masked Array2...
",arr2)

要判斷兩個陣列的所有元素是否相等,可以使用Python NumPy中的ma.allequal()方法:

print("
Result...
",ma.allequal(arr1, arr2))

示例

import numpy as np
import numpy.ma as ma

# Array 1
# Creating a 3x3 array with int elements using the numpy.arange() method
arr1 = np.arange(9).reshape((3,3))
print("Array1...
", arr1) print("
Array type...
", arr1.dtype) # Get the dimensions of the Array print("
Array Dimensions...
",arr1.ndim) # Get the shape of the Array print("
Our Array Shape...
",arr1.shape) # Get the number of elements of the Array print("
Elements in the Array...
",arr1.size) # Create a masked array arr1 = ma.array(arr1) # Mask Array1 arr1[0, 1] = ma.masked arr1[1, 1] = ma.masked # Display Masked Array 1 print("
Masked Array1...
",arr1) # Array 2 # Creating another 3x3 array with int elements using the numpy.arange() method arr2 = np.arange(9).reshape((3,3)) print("
Array2...
", arr2) print("
Array type...
", arr2.dtype) # Get the dimensions of the Array print("
Array Dimensions...
",arr2.ndim) # Get the shape of the Array print("
Our Array Shape...
",arr2.shape) # Get the number of elements of the Array print("
Elements in the Array...
",arr2.size) # Create a masked array arr2 = ma.array(arr2) # Mask Array2 arr2[2, 1] = ma.masked arr2[2, 2] = ma.masked # Display Masked Array 2 print("
Masked Array2...
",arr2) # To Return True if all entries of two arrays are equal, use the ma.allequal() method in Python Numpy print("
Result...
",ma.allequal(arr1, arr2))

輸出

Array1...
[[0 1 2]
[3 4 5]
[6 7 8]]

Array type...
int64

Array Dimensions...
2

Our Array Shape...
(3, 3)

Elements in the Array...
9

Masked Array1...
[[0 -- 2]
[3 -- 5]
[6 7 8]]

Array2...
[[0 1 2]
[3 4 5]
[6 7 8]]

Array type...
int64

Array Dimensions...
2

Our Array Shape...
(3, 3)

Elements in the Array...
9

Masked Array2...
[[0 1 2]
[3 4 5]
[6 -- --]]

Result...
True

更新於:2022年2月22日

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