I have a dataframe looks like this: date : sorted nicely Trigger : only T or F value : any random decimal (float) value col1 : represents number of days and can not be lower than -1.** -1<= col1 < infinity** col2 : represents number of days and cannot be negative. col2 >= 0 **Calculation logic ** If col1 == -1, then return 0, otherwise if Trigger == T, the following diagram will help to understand the logic. If we look at “red color”, +3 came from col1 which is col1==3 at 2020-08-01, what it means is that we jump