在 Numpy 中轉換輸入到掩碼陣列中,保留子類
要轉換輸入到被掩碼的陣列中保留子類,在 Python Numpy 中使用 numpy.ma.asanyarray() 方法。該函式返回輸入的 MaskedArray 解釋。
如果輸入是 MaskedArray 的子類,則保留其類。如果輸入已經是 ndarray,則不執行復制。第一個引數是要轉換輸入的任何形式的輸入資料。order 引數建議是使用行優先(“C”)還是列優先(“FORTRAN”)記憶體表示。預設值為 “C”。
步驟
首先,匯入所需庫 -
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([[65, 68, 81], [93, 33, 39], [73, 88, 51], [62, 45, 67]]) 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,並將其中一些作為無效值進行遮蔽 -
maskArr = ma.masked_array(arr, mask =[[1, 1, 0], [ 0, 0, 0], [0, 1, 0], [0, 1, 0]]) print("
Our Masked Array
", maskArr) print("
Our Masked Array type...
", maskArr.dtype)
獲取陣列的維度 -
print("
Our Masked Array Dimensions...
",arr.ndim)
獲取陣列的形狀 -
print("
Our Masked Array Shape...
",arr.shape)
獲取陣列的元素數量 -
print("
Elements in the Masked Array...
",arr.size)
要轉換輸入到被掩碼的陣列中保留子類,使用 numpy.ma.asanyarray() 方法 -
print("
Masked Array...
",np.ma.asanyarray(arr))
檢查型別 -
print("
Type...
",type(np.ma.asanyarray(arr)))
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([[65, 68, 81], [93, 33, 39], [73, 88, 51], [62, 45, 67]]) 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], [0, 1, 0], [0, 1, 0]]) print("
Our Masked Array
", maskArr) print("
Our Masked Array type...
", maskArr.dtype) # Get the dimensions of the Array print("
Our Masked Array Dimensions...
",arr.ndim) # Get the shape of the Array print("
Our Masked Array Shape...
",arr.shape) # Get the number of elements of the Array print("
Elements in the Masked Array...
",arr.size) # To convert the input to a masked array conserving subclasses, use the numpy.ma.asanyarray() method in Python Numpy print("
Masked Array...
",np.ma.asanyarray(arr)) # Check the type print("
Type...
",type(np.ma.asanyarray(arr)))
輸出
Array... [[65 68 81] [93 33 39] [73 88 51] [62 45 67]] Array type... int64 Array Dimensions... 2 Our Masked Array [[-- -- 81] [93 33 39] [73 -- 51] [62 -- 67]] Our Masked Array type... int64 Our Masked Array Dimensions... 2 Our Masked Array Shape... (4, 3) Elements in the Masked Array... 12 Masked Array... [[65 68 81] [93 33 39] [73 88 51] [62 45 67]] Type... <class 'numpy.ma.core.MaskedArray'>
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