I have a dataframe:
df =
| col1 | Aciton1 |
|---|---|
| 1 | A |
| 2 | B |
| 3 | C |
| 1 | C |
I want to edit df, such that when the value of col1 is bigger than 1 , take the value from Action1.
So I will get:
| col1 | Aciton1 | Previous_Aciton |
|---|---|---|
| 1 | A | Initial Action |
| 2 | B | A |
| 3 | C | B |
| 1 | C | Initial Action |
CodePudding user response：
If there are no negative and 0 values and each group starting by 1 is possible use 
the result:
