使用NumPy对掩码数组元素进行标量除法,并返回商和余数数组
要将掩码数组元素除以给定的标量元素并返回包含商和余数的数组,请在Python NumPy中使用**ma.MaskedArray.__divmod__()**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值无效),要么是布尔数组,用于确定关联数组的每个元素的值是否有效。
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,并且可以很好地与分布式、GPU和稀疏数组库配合使用。
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数元素的数组:
arr = np.array([[85, 68, 81, 84], [67, 33, 39, 53], [29, 88, 51, 37], [56, 45, 67, 85]])
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数量:
print("
Elements in the Masked Array...
",maskArr.size)标量:
val = 5
print("
The given value...
",val)要将掩码数组元素除以给定的标量元素并返回包含商和余数的数组,请使用ma.MaskedArray.__divmod__()方法:
print("
Resultant Arrays...
",maskArr.__divmod__(val))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([[85, 68, 81, 84], [67, 33, 39, 53], [29, 88, 51, 37], [56, 45, 67, 85]])
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 = 5
print("
The given value...
",val)
# To divide masked array elements by a given scalar element and return arrays with Quotient and Remainder,
# use the ma.MaskedArray.__divmod__() method
print("
Resultant Arrays...
",maskArr.__divmod__(val))输出
Array... [[85 68 81 84] [67 33 39 53] [29 88 51 37] [56 45 67 85]] Array type... int64 Array Dimensions... 2 Our Masked Array [[-- -- 81 84] [67 33 -- 53] [29 88 51 --] [56 -- 67 85]] 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... 5 Resultant Arrays... (masked_array( data=[[--, --, 16, 16], [13, 6, --, 10], [5, 17, 10, --], [11, --, 13, 17]], mask=[[ True, True, False, False], [False, False, True, False], [False, False, False, True], [False, True, False, False]], fill_value=999999), masked_array( data=[[--, --, 1, 4], [2, 3, --, 3], [4, 3, 1, --], [1, --, 2, 0]], mask=[[ True, True, False, False], [False, False, True, False], [False, False, False, True], [False, True, False, False]], fill_value=999999))
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