交換NumPy中掩碼陣列資料的位元組
要交換陣列元素的位元組,請使用NumPy中的**ma.MaskedArray.byteswap()**方法。透過返回一個位元組交換後的陣列(可選地就地交換)來在低位序和高位序資料表示之間切換。位元組字串陣列不會被交換。複數的實部和虛部分別被交換。它返回位元組交換後的陣列。如果inplace為True,則這是一個指向自身的檢視。
numpy.ma.MaskedArray是ndarray的子類,旨在處理具有缺失資料的數值陣列。MaskedArray的例項可以被認為是幾個元素的組合:
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([[35, 85, 45], [67, 33, 59]]) 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 =[[0, 0, 1], [ 0, 1, 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個數:
print("
Elements in the Masked Array...
",maskArr.size)
交換陣列元素的位元組,使用NumPy中的numpy.byteswap()方法:
print("
After Swap...
",maskArr.byteswap())
示例
# Python ma.MaskedArray - Swap the bytes of the masked array data import numpy as np import numpy.ma as ma # Create an array with int elements using the numpy.array() method arr = np.array([[35, 85, 45], [67, 33, 59]]) 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 =[[0, 0, 1], [ 0, 1, 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) # To swap the bytes of the array elements, use the byteswap() method in Numpy print("
After Swap...
",maskArr.byteswap())
輸出
Array... [[35 85 45] [67 33 59]] Array type... int64 Array Dimensions... 2 Our Masked Array [[35 85 --] [67 -- 59]] Our Masked Array type... int32 Our Masked Array Dimensions... 2 Our Masked Array Shape... (2, 3) Elements in the Masked Array... 6 After Swap... [[2522015791327477760 6124895493223874560 --] [4827858800541171712 -- 4251398048237748224]]
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