计算NumPy掩码数组中连续元素之间的差值


要计算掩码数组中连续元素之间的差值,请在Python NumPy中使用**MaskedArray.ediff1d()**方法。此函数等效于numpy.ediff1d,它考虑了掩码值,详情请参见numpy.ediff1d。

掩码数组是标准numpy.ndarray和掩码的组合。掩码可以是nomask(表示关联数组的任何值均有效)或布尔数组,它确定关联数组的每个元素的值是否有效。

步骤

首先,导入所需的库:

import numpy as np

使用numpy.array()方法创建一个包含整数元素的数组:

arr = np.array([[65, 68, 81], [93, 33, 76], [73, 88, 51], [62, 45, 67]])
print("Array...
", arr)

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, 0, 0], [ 0, 0, 0], [0, 1, 0], [0, 0, 0]])
print("
Our Masked Array...
", maskArr)

获取掩码数组的类型:

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个数:

print("
Number of elements in the Masked Array...
",maskArr.size)

要计算掩码数组中连续元素之间的差值,请在Python NumPy中使用MaskedArray.ediff1d()方法:

print("
Result..
.", np.ediff1d(maskArr))

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([[65, 68, 81], [93, 33, 76], [73, 88, 51], [62, 45, 67]])
print("Array...
", arr) # Create a masked array and mask some of them as invalid maskArr = ma.masked_array(arr, mask =[[1, 0, 0], [ 0, 0, 0], [0, 1, 0], [0, 0, 0]]) print("
Our Masked Array...
", maskArr) # Get the type of the masked array 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("
Number of elements in the Masked Array...
",maskArr.size) # To compute the differences between consecutive elements of a masked array, use the MaskedArray.ediff1d() method in Python Numpy print("
Result..
.", np.ediff1d(maskArr))

输出

Array...
[[65 68 81]
[93 33 76]
[73 88 51]
[62 45 67]]

Our Masked Array...
[[-- 68 81]
[93 33 76]
[73 -- 51]
[62 45 67]]

Our Masked Array type...
int64

Our Masked Array Dimensions...
2

Our Masked Array Shape...
(4, 3)

Number of elements in the Masked Array...
12

Result..
. [-- 13 12 -60 43 -3 -- -- 11 -17 22]

更新于:2022年2月8日

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