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
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