在 NumPy 中沿軸 1 重複掩碼陣列的元素
要重複掩碼陣列的元素,請在 NumPy 中使用 **ma.MaskedArray.repeat()** 方法。“**repeats**”引數設定每個元素的重複次數。repeats 將被廣播以適應形狀。“axis”引數是沿其重複值的軸。軸值設定為 1。
該方法返回輸出陣列,其形狀與 a 相同,除了給定的軸。軸是沿其重複值的軸。預設情況下,使用扁平化的輸入陣列,並返回扁平化的輸出陣列。
步驟
首先,匯入所需的庫:
import numpy as np import numpy.ma as ma
使用 numpy.array() 方法建立一個包含整型元素的陣列:
arr = np.array([[49, 85, 45], [67, 33, 59]])
print("Array...
", arr)
print("
Array type...
", arr.dtype)獲取陣列的維度:
print("Array Dimensions...
",arr.ndim)
建立一個掩碼陣列,並將其中一些標記為無效:
maskArr = ma.masked_array(arr, mask =[[0, 0, 1], [ 0, 1, 0]])
print("
Our Masked Array
", maskArr)
print("
Our Masked Array type...
", maskArr.dtype)獲取掩碼陣列的維度:
print("
Our Masked Array Dimensions...
",maskArr.ndim)
獲取掩碼陣列的形狀:
print("
Our Masked Array Shape...
",maskArr.shape)獲取掩碼陣列的元素個數:
print("
Elements in the Masked Array...
",maskArr.size)
要重複掩碼陣列的元素,請在 NumPy 中使用 ma.MaskedArray.repeat() 方法。“repeats”引數設定每個元素的重複次數。repeats 將被廣播以適應形狀。“axis”引數是沿其重複值的軸。預設情況下,使用扁平化的輸入陣列,並返回扁平化的輸出陣列。軸值設定為 1:
print("
Result...
",maskArr.repeat(3, axis = 1))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 1
print("
Result...
",maskArr.repeat(3, axis = 1))輸出
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 59 59 77 77 77] [67 67 67 33 33 33 -- -- -- 57 57 57] [29 29 29 88 88 88 51 51 51 -- -- --] [56 56 56 -- -- -- 99 99 99 85 85 85]]
廣告
資料結構
網路
關係資料庫管理系統 (RDBMS)
作業系統
Java
iOS
HTML
CSS
Android
Python
C 程式設計
C++
C#
MongoDB
MySQL
Javascript
PHP