在 NumPy 中沿軸 0 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 會廣播以適應形狀。“axis”引數是要重複值的軸。軸值設定為 0。
該方法返回輸出陣列,其形狀與 a 相同,除了給定的軸。軸是要重複值的軸。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數元素的陣列 -
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數量 -
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 會廣播以適應形狀。“axis”引數是要重複值的軸。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 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))
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 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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