使用NumPy對掩碼陣列元素進行標量除法,並返回商和餘數陣列
要將掩碼陣列元素除以給定的標量元素並返回包含商和餘數的陣列,請在Python NumPy中使用**ma.MaskedArray.__divmod__()**方法。掩碼陣列是標準numpy.ndarray和掩碼的組合。掩碼要麼是nomask(表示關聯陣列的無任何值無效),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。
NumPy 提供了全面的數學函式、隨機數生成器、線性代數例程、傅立葉變換等等。它支援各種硬體和計算平臺,並且可以很好地與分散式、GPU和稀疏陣列庫配合使用。
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([[85, 68, 81, 84], [67, 33, 39, 53], [29, 88, 51, 37], [56, 45, 67, 85]])
print("Array...
", arr)
print("
Array type...
", arr.dtype)獲取陣列的維度:
print("Array Dimensions...
",arr.ndim)建立一個掩碼陣列並將其中一些標記為無效:
maskArr = ma.masked_array(arr, mask =[[1, 1, 0, 0], [ 0, 0, 1, 0], [0, 0, 0, 1], [0, 1, 0, 0]])
print("
Our Masked Array
", maskArr)
print("
Our Masked Array type...
", maskArr.dtype)獲取掩碼陣列的維度:
print("
Our Masked Array Dimensions...
",maskArr.ndim)獲取掩碼陣列的形狀:
print("
Our Masked Array Shape...
",maskArr.shape)獲取掩碼陣列的元素數量:
print("
Elements in the Masked Array...
",maskArr.size)標量:
val = 5
print("
The given value...
",val)要將掩碼陣列元素除以給定的標量元素並返回包含商和餘數的陣列,請使用ma.MaskedArray.__divmod__()方法:
print("
Resultant Arrays...
",maskArr.__divmod__(val))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([[85, 68, 81, 84], [67, 33, 39, 53], [29, 88, 51, 37], [56, 45, 67, 85]])
print("Array...
", arr)
print("
Array type...
", arr.dtype)
# Get the dimensions of the Array
print("
Array Dimensions...
",arr.ndim)
# Create a masked array and mask some of them as invalid
maskArr = ma.masked_array(arr, mask =[[1, 1, 0, 0], [ 0, 0, 1, 0], [0, 0, 0, 1], [0, 1, 0, 0]])
print("
Our Masked Array
", maskArr)
print("
Our Masked Array type...
", maskArr.dtype)
# Get the dimensions of the Masked Array
print("
Our Masked Array Dimensions...
",maskArr.ndim)
# Get the shape of the Masked Array
print("
Our Masked Array Shape...
",maskArr.shape)
# Get the number of elements of the Masked Array
print("
Elements in the Masked Array...
",maskArr.size)
# The scalar
val = 5
print("
The given value...
",val)
# To divide masked array elements by a given scalar element and return arrays with Quotient and Remainder,
# use the ma.MaskedArray.__divmod__() method
print("
Resultant Arrays...
",maskArr.__divmod__(val))輸出
Array... [[85 68 81 84] [67 33 39 53] [29 88 51 37] [56 45 67 85]] Array type... int64 Array Dimensions... 2 Our Masked Array [[-- -- 81 84] [67 33 -- 53] [29 88 51 --] [56 -- 67 85]] Our Masked Array type... int64 Our Masked Array Dimensions... 2 Our Masked Array Shape... (4, 4) Elements in the Masked Array... 16 The given value... 5 Resultant Arrays... (masked_array( data=[[--, --, 16, 16], [13, 6, --, 10], [5, 17, 10, --], [11, --, 13, 17]], mask=[[ True, True, False, False], [False, False, True, False], [False, False, False, True], [False, True, False, False]], fill_value=999999), masked_array( data=[[--, --, 1, 4], [2, 3, --, 3], [4, 3, 1, --], [1, --, 2, 0]], mask=[[ True, True, False, False], [False, False, True, False], [False, False, False, True], [False, True, False, False]], fill_value=999999))
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