从 NumPy 中的掩码数组返回指定的对角线
要返回指定的对角线,请使用 Python Numpy 中的ma.MaskedArray.diagonal方法。掩码数组是标准numpy.ndarray和掩码的组合。掩码要么是 nomask,表示关联数组的任何值都无效,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。
脚步
首先,导入所需的库 -
import numpy as npimportnumpy.maas ma
使用该方法创建一个包含 int 元素的数组-numpy.array()
arr = np.array([[49, 85, 45], [67, 33, 59]])print("Array...\n", arr)
print("\nArray type...\n", arr.dtype)
获取数组的维度 -
print("Array Dimensions...\n",arr.ndim)
创建一个屏蔽数组并将其中一些屏蔽为无效 -
maskArr = ma.masked_array(arr, mask =[[0, 0, 1], [ 0, 1, 0]])print("\nOur Masked Array\n", maskArr)
print("\nOur Masked Array type...\n", maskArr.dtype)
获取 Masked Array 的尺寸 -
print("\nOur Masked Array Dimensions...\n",maskArr.ndim)
获取蒙面阵列的形状 -
print("\nOur Masked Array Shape...\n",maskArr.shape)
获取 Masked Array 的元素数量 -
print("\nElements in the Masked Array...\n",maskArr.size)
返回指定的对角线,使用 ma。Numpy 中的方法 -MaskedArray.diagonal()
print("\nResult...\n",maskArr.diagonal())
示例
import numpy as np输出结果importnumpy.maas 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...\n", arr)
print("\nArray type...\n", arr.dtype)
# Get the dimensions of the Array
print("\nArray Dimensions...\n",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("\nOur Masked Array\n", maskArr)
print("\nOur Masked Array type...\n", maskArr.dtype)
# Get the dimensions of the Masked Array
print("\nOur Masked Array Dimensions...\n",maskArr.ndim)
# Get the shape of the Masked Array
print("\nOur Masked Array Shape...\n",maskArr.shape)
# Get the number of elements of the Masked Array
print("\nElements in the Masked Array...\n",maskArr.size)
# To return specified diagonals, use the ma.MaskedArray.diagonal() method in Numpy
print("\nResult...\n",maskArr.diagonal())
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...
[-- 33 51 85]
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