python - 仅当四肢具有相同的值并且限制为最多出现时,如何填充数据空白?
问题描述
我在这里搜索了很多可以解决此问题但找不到的答案。期望的结果是仅在四肢相等时填充间隙,限制为 4 个值的长度:
我的数据集:
0 NaN
1 NaN
2 NaN
3 5.0
4 5.0
5 NaN
6 NaN
7 5.0
8 6.0
9 NaN
10 NaN
11 NaN
12 NaN
13 NaN
14 NaN
15 5.0
16 5.0
17 NaN
18 NaN
19 6.0
20 6.0
21 NaN
22 NaN
23 NaN
24 NaN
25 5.0
26 NaN
27 NaN
28 NaN
29 NaN
30 NaN
31 NaN
32 NaN
33 5.0
34 NaN
35 NaN
期望的结果(仅在四肢相等时填充间隙,限制长度为 4 的间隙):
0 NaN # Not filled since the gap ends with 5 but this is the dataset beginning (don't know how it starts)
1 NaN # Not filled since the gap ends with 5 but this is the dataset beginning (don't know how it starts)
2 NaN # Not filled since the gap ends with 5 but this is the dataset beginning (don't know how it starts)
3 5.0 # Original dataset
4 5.0 # Original dataset
5 5.0 # Filled since the gap starts with 5 and ends with 5 (and is smaller than 4 values)
6 5.0 # Filled since the gap starts with 5 and ends with 5 (and is smaller than 4 values)
7 5.0 # Original dataset
8 6.0 # Original dataset
9 NaN # Not filled since the gap starts with 6 and ends with 5
10 NaN .
11 NaN .
12 NaN .
13 NaN .
14 NaN # Not filled since the gap starts with 6 and ends with 5
15 5.0 # Original dataset
16 5.0 # Original dataset
17 NaN # Not filled since the gap starts with 5 and ends with 6
18 NaN # Not filled since the gap starts with 5 and ends with 6
19 6.0 # Original dataset
20 6.0 # Original dataset
21 NaN # Not filled since the gap starts with 6 and ends with 5
22 NaN .
23 NaN .
24 NaN # Not filled since the gap starts with 6 and ends with 5
25 5.0 # Original dataset
26 5.0 # Filled since the gap starts with 5 and ends with 5
27 5.0 # Filled since the gap starts with 5 and ends with 5
28 5.0 # Filled since the gap starts with 5 and ends with 5
29 5.0 # Filled since the gap starts with 5 and ends with 5
30 NaN # Not filled since maximum gap is 4
31 NaN # Not filled since maximum gap is 4
32 NaN # Not filled since maximum gap is 4
33 5.0 # Original dataset
34 NaN # Not filled since the gap starts with 5 but this is the dataset end (don't know how it ends)
35 NaN # Not filled since the gap starts with 5 but this is the dataset end (don't know how it ends)
解决方案
它应该是这样的:
def extremities(arr):
nones = [i for i,x in enumerate(arr) if x == None]
not_nones = [i for i,x in enumerate(arr) if x != None]
for i in nones:
try:
start = [x for x in not_nones if x < i][-1]
finish = [x for x in not_nones if x > i][0]
except:
continue
if arr[start] == arr[finish] and i - start < 5:
arr[i] = arr[start]
return arr
编辑:
抱歉,我忘了它限制为 4 个值的长度。我编辑了代码。
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