I have a dataframe:
df = pd.DataFrame({
'x': [3,4,5,8,10,11,12,13,15,16,18,21,24,25],
'a': [10,9,16,4,21,5,3,17,11,5,21,19,3,9]
})
df
Out[30]:
a x
0 10 3
1 9 4
2 16 5
3 4 8
4 21 10
5 5 11
6 3 12
7 17 13
8 11 15
9 5 16
10 21 18
11 19 21
12 3 24
for every "x" value I should subtract a certain number (say 3), and then find a
maximum "a" value where x is in a range from x-3 to x.
For example:
index, x, x-3, max(a) where x is between x-3 and x
0, 3, 0, 10
1, 4, 1, 10
2, 5, 2, 16
3, 8, 5, 16
4, 10, 7, 21
...
"x" is incremental, "a" is random
How to find max "a" values?
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