NumPy 中掩蓋大於或等於給定值的陣列元素
要掩蓋一個數組中大於或等於給定值的部分,請在 Python NumPy 中使用 **numpy.ma.masked_greater_equal()** 方法。此函式是 masked_where 的快捷方式,其中 condition = (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,要麼是一個布林陣列,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() 方法建立具有整型元素的陣列 -
arr = np.array([[83, 55, 91], [90, 49, 39], [73, 83, 51], [82, 45, 67]]) print("Array...
", arr)
獲取陣列的型別 -
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)
獲取陣列的元素數量 -
print("
Number of Elements in the Array...
",arr.size)
要掩蓋一個數組中大於或等於給定值的部分,請使用 numpy.ma.masked_greater_equal() 方法。在這裡,我們將掩蓋陣列中大於或等於值 83 的部分 -
print("
Result...
",np.ma.masked_greater_equal(arr, 83))
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([[83, 55, 91], [90, 49, 39], [73, 83, 51], [82, 45, 67]]) print("Array...
", arr) # Get the type pf array 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("
Number of Elements in the Array...
",arr.size) # To mask an array where greater than equal to a given value, use the numpy.ma.masked_greater_equal() method in Python Numpy # Here, we will the array greater than equal to value 83 print("
Result...
",np.ma.masked_greater_equal(arr, 83))
輸出
Array... [[83 55 91] [90 49 39] [73 83 51] [82 45 67]] Array type... int64 Array Dimensions... 2 Our Array Shape... (4, 3) Number of Elements in the Array... 12 Result... [[-- 55 --] [-- 49 39] [73 -- 51] [82 45 67]]
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