pandas filling nans by mean of before and after non-nan values
11
I would like to fill df's nan with an average of adjacent elements.
Consider a dataframe:
df = pd.DataFrame({'val': [1,np.nan, 4, 5, np.nan, 10, 1,2,5, np.nan, np.nan, 9]})
val
0 1.0
1 NaN
2 4.0
3 5.0
4 NaN
5 10.0
6 1.0
7 2.0
8 5.0
9 NaN
10 NaN
11 9.0
My desired output is:
val
0 1.0
1 2.5
2 4.0
3 5.0
4 7.5
5 10.0
6 1.0
7 2.0
8 5.0
9 7.0 <<< deadend
10 7.0 <<< deadend
11 9.0
I've looked into other solutions such as Fill cell containing NaN with average of value before and after, but this won't work in case of two or more consecutive np.nans.
Any help is greatly appreciated!
python pandas
asked 51 mins ago
ChrisChris
1,206214
add a comment |
11
I would like to fill df's nan with an average of adjacent elements.
Consider a dataframe:
df = pd.DataFrame({'val': [1,np.nan, 4, 5, np.nan, 10, 1,2,5, np.nan, np.nan, 9]})
val
0 1.0
1 NaN
2 4.0
3 5.0
4 NaN
5 10.0
6 1.0
7 2.0
8 5.0
9 NaN
10 NaN
11 9.0
My desired output is:
val
0 1.0
1 2.5
2 4.0
3 5.0
4 7.5
5 10.0
6 1.0
7 2.0
8 5.0
9 7.0 <<< deadend
10 7.0 <<< deadend
11 9.0
I've looked into other solutions such as Fill cell containing NaN with average of value before and after, but this won't work in case of two or more consecutive np.nans.
Any help is greatly appreciated!
python pandas
asked 51 mins ago
ChrisChris
1,206214
add a comment |
11
11
11
1
I would like to fill df's nan with an average of adjacent elements.
Consider a dataframe:
df = pd.DataFrame({'val': [1,np.nan, 4, 5, np.nan, 10, 1,2,5, np.nan, np.nan, 9]})
val
0 1.0
1 NaN
2 4.0
3 5.0
4 NaN
5 10.0
6 1.0
7 2.0
8 5.0
9 NaN
10 NaN
11 9.0
My desired output is:
val
0 1.0
1 2.5
2 4.0
3 5.0
4 7.5
5 10.0
6 1.0
7 2.0
8 5.0
9 7.0 <<< deadend
10 7.0 <<< deadend
11 9.0
I've looked into other solutions such as Fill cell containing NaN with average of value before and after, but this won't work in case of two or more consecutive np.nans.
Any help is greatly appreciated!
python pandas
asked 51 mins ago
ChrisChris
1,206214
I would like to fill df's nan with an average of adjacent elements.
Consider a dataframe:
df = pd.DataFrame({'val': [1,np.nan, 4, 5, np.nan, 10, 1,2,5, np.nan, np.nan, 9]})
val
0 1.0
1 NaN
2 4.0
3 5.0
4 NaN
5 10.0
6 1.0
7 2.0
8 5.0
9 NaN
10 NaN
11 9.0
My desired output is:
val
0 1.0
1 2.5
2 4.0
3 5.0
4 7.5
5 10.0
6 1.0
7 2.0
8 5.0
9 7.0 <<< deadend
10 7.0 <<< deadend
11 9.0
I've looked into other solutions such as Fill cell containing NaN with average of value before and after, but this won't work in case of two or more consecutive np.nans.
Any help is greatly appreciated!
python pandas
python pandas
asked 51 mins ago
ChrisChris
1,206214
asked 51 mins ago
ChrisChris
1,206214
asked 51 mins ago
ChrisChris
1,206214
asked 51 mins ago
ChrisChris
1,206214
asked 51 mins ago
ChrisChris
1,206214
1,206214
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
14
Use ffill + bfill and divide by 2:
df = (df.ffill()+df.bfill())/2
print(df)
val
0 1.0
1 2.5
2 4.0
3 5.0
4 7.5
5 10.0
6 1.0
7 2.0
8 5.0
9 7.0
10 7.0
11 9.0
EDIT : If 1st and last element contains NaN then use (Dark
suggestion):
df = pd.DataFrame({'val':[np.nan,1,np.nan, 4, 5, np.nan,
10, 1,2,5, np.nan, np.nan, 9,np.nan,]})
df = (df.ffill()+df.bfill())/2
df = df.bfill().ffill()
print(df)
val
0 1.0
1 1.0
2 2.5
3 4.0
4 5.0
5 7.5
6 10.0
7 1.0
8 2.0
9 5.0
10 7.0
11 7.0
12 9.0
13 9.0
answered 45 mins ago
Sandeep KadapaSandeep Kadapa
6,873630
3
That is just brilliant. Thanks a ton :)
– Chris
44 mins ago
@Chris Glad to help.
– Sandeep Kadapa
38 mins ago
3
If first and last elements arenan. Then usedf.bfill().ffill()after using the above solution.
– Dark
23 mins ago
@anon01 Good point
– Chris
21 mins ago
@Dark Great suggestion :) Thanks for the insight
– Chris
20 mins ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
14
Use ffill + bfill and divide by 2:
df = (df.ffill()+df.bfill())/2
print(df)
val
0 1.0
1 2.5
2 4.0
3 5.0
4 7.5
5 10.0
6 1.0
7 2.0
8 5.0
9 7.0
10 7.0
11 9.0
EDIT : If 1st and last element contains NaN then use (Dark
suggestion):
df = pd.DataFrame({'val':[np.nan,1,np.nan, 4, 5, np.nan,
10, 1,2,5, np.nan, np.nan, 9,np.nan,]})
df = (df.ffill()+df.bfill())/2
df = df.bfill().ffill()
print(df)
val
0 1.0
1 1.0
2 2.5
3 4.0
4 5.0
5 7.5
6 10.0
7 1.0
8 2.0
9 5.0
10 7.0
11 7.0
12 9.0
13 9.0
answered 45 mins ago
Sandeep KadapaSandeep Kadapa
6,873630
3
That is just brilliant. Thanks a ton :)
– Chris
44 mins ago
@Chris Glad to help.
– Sandeep Kadapa
38 mins ago
3
If first and last elements arenan. Then usedf.bfill().ffill()after using the above solution.
– Dark
23 mins ago
@anon01 Good point
– Chris
21 mins ago
@Dark Great suggestion :) Thanks for the insight
– Chris
20 mins ago
add a comment |
14
Use ffill + bfill and divide by 2:
df = (df.ffill()+df.bfill())/2
print(df)
val
0 1.0
1 2.5
2 4.0
3 5.0
4 7.5
5 10.0
6 1.0
7 2.0
8 5.0
9 7.0
10 7.0
11 9.0
EDIT : If 1st and last element contains NaN then use (Dark
suggestion):
df = pd.DataFrame({'val':[np.nan,1,np.nan, 4, 5, np.nan,
10, 1,2,5, np.nan, np.nan, 9,np.nan,]})
df = (df.ffill()+df.bfill())/2
df = df.bfill().ffill()
print(df)
val
0 1.0
1 1.0
2 2.5
3 4.0
4 5.0
5 7.5
6 10.0
7 1.0
8 2.0
9 5.0
10 7.0
11 7.0
12 9.0
13 9.0
answered 45 mins ago
Sandeep KadapaSandeep Kadapa
6,873630
3
That is just brilliant. Thanks a ton :)
– Chris
44 mins ago
@Chris Glad to help.
– Sandeep Kadapa
38 mins ago
3
If first and last elements arenan. Then usedf.bfill().ffill()after using the above solution.
– Dark
23 mins ago
@anon01 Good point
– Chris
21 mins ago
@Dark Great suggestion :) Thanks for the insight
– Chris
20 mins ago
add a comment |
14
14
14
Use ffill + bfill and divide by 2:
df = (df.ffill()+df.bfill())/2
print(df)
val
0 1.0
1 2.5
2 4.0
3 5.0
4 7.5
5 10.0
6 1.0
7 2.0
8 5.0
9 7.0
10 7.0
11 9.0
EDIT : If 1st and last element contains NaN then use (Dark
suggestion):
df = pd.DataFrame({'val':[np.nan,1,np.nan, 4, 5, np.nan,
10, 1,2,5, np.nan, np.nan, 9,np.nan,]})
df = (df.ffill()+df.bfill())/2
df = df.bfill().ffill()
print(df)
val
0 1.0
1 1.0
2 2.5
3 4.0
4 5.0
5 7.5
6 10.0
7 1.0
8 2.0
9 5.0
10 7.0
11 7.0
12 9.0
13 9.0
answered 45 mins ago
Sandeep KadapaSandeep Kadapa
6,873630
Use ffill + bfill and divide by 2:
df = (df.ffill()+df.bfill())/2
print(df)
val
0 1.0
1 2.5
2 4.0
3 5.0
4 7.5
5 10.0
6 1.0
7 2.0
8 5.0
9 7.0
10 7.0
11 9.0
EDIT : If 1st and last element contains NaN then use (Dark
suggestion):
df = pd.DataFrame({'val':[np.nan,1,np.nan, 4, 5, np.nan,
10, 1,2,5, np.nan, np.nan, 9,np.nan,]})
df = (df.ffill()+df.bfill())/2
df = df.bfill().ffill()
print(df)
val
0 1.0
1 1.0
2 2.5
3 4.0
4 5.0
5 7.5
6 10.0
7 1.0
8 2.0
9 5.0
10 7.0
11 7.0
12 9.0
13 9.0
answered 45 mins ago
Sandeep KadapaSandeep Kadapa
6,873630
edited 19 mins ago
answered 45 mins ago
Sandeep KadapaSandeep Kadapa
6,873630
answered 45 mins ago
Sandeep KadapaSandeep Kadapa
6,873630
answered 45 mins ago
Sandeep KadapaSandeep Kadapa
6,873630
6,873630
3
That is just brilliant. Thanks a ton :)
– Chris
44 mins ago
@Chris Glad to help.
– Sandeep Kadapa
38 mins ago
3
If first and last elements arenan. Then usedf.bfill().ffill()after using the above solution.
– Dark
23 mins ago
@anon01 Good point
– Chris
21 mins ago
@Dark Great suggestion :) Thanks for the insight
– Chris
20 mins ago
add a comment |
3
That is just brilliant. Thanks a ton :)
– Chris
44 mins ago
@Chris Glad to help.
– Sandeep Kadapa
38 mins ago
3
If first and last elements arenan. Then usedf.bfill().ffill()after using the above solution.
– Dark
23 mins ago
@anon01 Good point
– Chris
21 mins ago
@Dark Great suggestion :) Thanks for the insight
– Chris
20 mins ago
3
3
That is just brilliant. Thanks a ton :)
– Chris
44 mins ago
That is just brilliant. Thanks a ton :)
– Chris
44 mins ago
@Chris Glad to help.
– Sandeep Kadapa
38 mins ago
@Chris Glad to help.
– Sandeep Kadapa
38 mins ago
3
3
If first and last elements are
nan. Then use df.bfill().ffill() after using the above solution.– Dark
23 mins ago
If first and last elements are
nan. Then use df.bfill().ffill() after using the above solution.– Dark
23 mins ago
@anon01 Good point
– Chris
21 mins ago
@anon01 Good point
– Chris
21 mins ago
@Dark Great suggestion :) Thanks for the insight
– Chris
20 mins ago
@Dark Great suggestion :) Thanks for the insight
– Chris
20 mins ago
add a comment |
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