在 NumPy 中沿轴 0 重复掩码数组的元素
要重复掩码数组的元素,请在 NumPy 中使用 **ma.MaskedArray.repeat()** 方法。“**repeats**”参数设置每个元素的重复次数。repeats 会广播以适应形状。“axis”参数是要重复值的轴。轴值设置为 0。
该方法返回输出数组,其形状与 a 相同,除了给定的轴。轴是要重复值的轴。默认情况下,使用扁平化的输入数组,并返回扁平化的输出数组。
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([[49, 85, 45], [67, 33, 59]])
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 =[[0, 0, 1], [ 0, 1, 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)
要重复掩码数组的元素,请在 NumPy 中使用 ma.MaskedArray.repeat() 方法。“repeats”参数设置每个元素的重复次数。repeats 会广播以适应形状。“axis”参数是要重复值的轴。默认情况下,使用扁平化的输入数组,并返回扁平化的输出数组。轴值设置为 0 -
print("
Result...
",maskArr.repeat(3, axis = 0))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([[55, 85, 59, 77], [67, 33, 39, 57], [29, 88, 51, 37], [56, 45, 99, 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)
# To repeat elements of a masked array, use the ma.MaskedArray.repeat() method in Numpy
# The "repeats" parameter sets the number of repetitions for each element.
# The repeats is broadcasted to fit the shape.
# The "axis" parameter is the axis along which to repeat values.
# By default, use the flattened input array, and return a flat output array.
# The axis value set to 0
print("
Result...
",maskArr.repeat(3, axis = 0))输出
Array... [[55 85 59 77] [67 33 39 57] [29 88 51 37] [56 45 99 85]] Array type... int64 Array Dimensions... 2 Our Masked Array [[-- -- 59 77] [67 33 -- 57] [29 88 51 --] [56 -- 99 85]] Our Masked Array type... int64 Our Masked Array Dimensions... 2 Our Masked Array Shape... (4, 4) Elements in the Masked Array... 16 Result... [[-- -- 59 77] [-- -- 59 77] [-- -- 59 77] [67 33 -- 57] [67 33 -- 57] [67 33 -- 57] [29 88 51 --] [29 88 51 --] [29 88 51 --] [56 -- 99 85] [56 -- 99 85] [56 -- 99 85]]
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