Rabbit :
everybody. I have a pandas DataFrame containing about 5 million rows, one of the columns contains information about the electrical signal. I would like to calculate the average value around each point with a step forward and backward, for example, for a point with an index of 10, calculate the average between (8, 9, 11, 12).
I know that there is a rolling method, but it takes values from the point only forward. I don 't want to write a loop.
Jaroslav Bezděk :
You can achieve this by setting center parameter in pandas.DataFrame.rolling() method to True. As documentation says:
By default, the result is set to the right edge of the window. This can be changed to the center of the window by setting center=True.
Here is a simple example:
>>> serie = pd.Series(range(15))
>>> print(serie.rolling(5, center=True).mean())
0 NaN
1 NaN
2 2.0
3 3.0
4 4.0
5 5.0
6 6.0
7 7.0
8 8.0
9 9.0
10 10.0
11 11.0
12 12.0
13 NaN
14 NaN
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