在 Numpy 中转换输入到掩码数组中,保留子类
要转换输入到被掩码的数组中保留子类,在 Python Numpy 中使用 numpy.ma.asanyarray() 方法。该函数返回输入的 MaskedArray 解释。
如果输入是 MaskedArray 的子类,则保留其类。如果输入已经是 ndarray,则不执行复制。第一个参数是要转换输入的任何形式的输入数据。order 参数建议是使用行优先(“C”)还是列优先(“FORTRAN”)内存表示。默认值为 “C”。
步骤
首先,导入所需库 -
import numpy as np import numpy.ma as ma
使用 numpy.array() 方法创建一个包含整数元素的数组 -
arr = np.array([[65, 68, 81], [93, 33, 39], [73, 88, 51], [62, 45, 67]])
print("Array...
", arr)
print("
Array type...
", arr.dtype)获取数组的维度 -
print("
Array Dimensions...
",arr.ndim)
创建一个掩码数组,并将其中一些作为无效值进行屏蔽 -
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)获取数组的维度 -
print("
Our Masked Array Dimensions...
",arr.ndim)
获取数组的形状 -
print("
Our Masked Array Shape...
",arr.shape)获取数组的元素数量 -
print("
Elements in the Masked Array...
",arr.size)
要转换输入到被掩码的数组中保留子类,使用 numpy.ma.asanyarray() 方法 -
print("
Masked Array...
",np.ma.asanyarray(arr))检查类型 -
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)))输出
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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