NumPy中掩蓋小於等於給定值的陣列
要掩蓋小於等於給定值的陣列,請在Python NumPy中使用**numpy.ma.masked_less_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),要麼是一個布林型陣列,它決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([[83, 55, 73], [90, 49, 39], [73, 87, 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)
獲取陣列的元素個數:
print("
Number of Elements in the Array...
",arr.size)要掩蓋小於等於給定值的陣列,請使用numpy.ma.masked_less_equal()方法。這裡,我們將掩蓋小於等於值73的陣列:
print("
Result...
",np.ma.masked_less_equal(arr, 73))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, 73], [90, 49, 39], [73, 87, 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 less than equal to a given value, use the numpy.ma.masked_less_equal() method in Python Numpy
# Here, we will the array less than equal to value 73
print("
Result...
",np.ma.masked_less_equal(arr, 73))輸出
Array... [[83 55 73] [90 49 39] [73 87 51] [82 45 67]] Array type... int64 Array Dimensions... 2 Our Array Shape... (4, 3) Number of Elements in the Array... 12 Result... [[83 -- --] [90 -- --] [-- 87 --] [82 -- --]]
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