使用Python对掩码数组的每个元素进行异或运算
要对掩码数组的每个元素与给定的标量值进行异或运算,请在Python NumPy中使用**ma.MaskedArray.__xor__()**方法。掩码数组是标准numpy.ndarray和掩码的组合。掩码要么是nomask(表示关联数组的无任何无效值),要么是一个布尔数组,它决定关联数组的每个元素是否有效。
NumPy 提供了全面的数学函数、随机数生成器、线性代数例程、傅里叶变换等等。它支持各种硬件和计算平台,并且与分布式、GPU和稀疏数组库兼容良好。
步骤
首先,导入所需的库:
import numpy as np import numpy.ma as ma
使用numpy.array()方法创建一个包含整型元素的数组:
arr = np.array([[8, 6, 1, 4], [6, 3, 9, 5], [9, 8, 1, 3], [5, 4, 7, 5]])
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,并将其中一些标记为无效:
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)获取掩码数组的维度:
print("
Our Masked Array Dimensions...
",maskArr.ndim)获取掩码数组的形状:
print("
Our Masked Array Shape...
",maskArr.shape)获取掩码数组的元素个数:
print("
Elements in the Masked Array...
",maskArr.size)标量值:
val = 3
print("
The given value..
",val)要对掩码数组的每个元素与给定的标量值进行异或运算,请使用ma.MaskedArray.__xor__()方法:
print("
Resultant Array...
",maskArr.__xor__(val))示例
# Python ma.MaskedArray - XOR every element of a masked array by a given scalar value
import numpy as np
import numpy.ma as ma
# Create an array with int elements using the numpy.array() method
arr = np.array([[8, 6, 1, 4], [6, 3, 9, 5], [9, 8, 1, 3], [5, 4, 7,5]])
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 = 3
print("
The given value..
",val)
# To XOR every element of a masked array by a given scalar value,
# use the ma.MaskedArray.__xor__() method
print("
Resultant Array...
",maskArr.__xor__(val))输出
Array... [[8 6 1 4] [6 3 9 5] [9 8 1 3] [5 4 7 5]] Array type... int64 Array Dimensions... 2 Our Masked Array [[-- -- 1 4] [6 3 -- 5] [9 8 1 --] [5 -- 7 5]] 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.. 3 Resultant Array... [[-- -- 2 7] [5 0 -- 6] [10 11 2 --] [6 -- 4 6]]
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