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))
Learn Python in-depth with real-world projects through our Python certification course. Enroll and become a certified expert to boost your career.
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]]
广告