NumPy中掩蓋等於給定值的陣列元素
要掩蓋等於給定值的陣列,請在Python NumPy中使用**numpy.ma.masked_equal()**方法。此函式是masked_where的快捷方式,條件為(x == value)。對於浮點陣列,請考慮使用masked_values(x, value)。
掩碼陣列是標準numpy.ndarray和掩碼的組合。掩碼要麼是nomask(表示關聯陣列的任何值均有效),要麼是布林陣列,用於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 import numpy.ma as ma
使用numpy.array()方法建立一個包含整數元素的陣列:
arr = np.array([[74, 55, 91], [93, 33, 39], [73, 93, 51], [93, 45, 67]]) print("Array...
", arr) print("
Array type...
", arr.dtype)
獲取陣列的維度:
print("
Array Dimensions...
",arr.ndim)
獲取陣列的形狀:
print("
Our Array Shape...
",arr.shape)
獲取陣列的元素個數:
print("
Elements in the Array...
",arr.size)
要掩蓋等於給定值的陣列,請使用numpy.ma.masked_equal()方法:
print("
Result...
",np.ma.masked_equal(arr, 93))
示例
import numpy as np import numpy.ma as ma # Create an array with int elements using the numpy.array() method arr = np.array([[74, 55, 91], [93, 33, 39], [73, 93, 51], [93, 45, 67]]) print("Array...
", arr) print("
Array type...
", arr.dtype) # Get the dimensions of the Array print("
Array Dimensions...
",arr.ndim) # Get the shape of the Array print("
Our Array Shape...
",arr.shape) # Get the number of elements of the Array print("
Elements in the Array...
",arr.size) # To mask an array where equal to a given value, use the numpy.ma.masked_equal() method in Python Numpy print("
Result...
",np.ma.masked_equal(arr, 93))
輸出
Array... [[74 55 91] [93 33 39] [73 93 51] [93 45 67]] Array type... int64 Array Dimensions... 2 Our Array Shape... (4, 3) Elements in the Array... 12 Result... [[74 55 91] [-- 33 39] [73 -- 51] [-- 45 67]]
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