Given the following data:
id|datee | price | quant | discrete_x
1 2018-12-19 4 -3000 A
1 2018-12-04 4 3000 A
1 2018-12-21 4 3000 B
1 2018-12-20 3 2000 A
...
Desired output:
id|datee | price | quant | discrete_x
1 2018-12-21 4 3000 B
1 2018-12-20 3 2000 A
...
In this case, it is quite clear that the quantity (quant) of 3000 is refunded, then bought again. I would like to remove the two rows for cancelling each other out. Given that id and quant match while the refund happens once and after a purchase of matching number of quant, how would I be able to remove all of them for each id value?
I've been considering (but stuck on) two ideas so far:
1) Within an arranged group_by values, check the later dates within a column to see if quant would match as opposite values
2) For loop within a for loop
I feel that for loop within a for loop is better, but not sure how I would match on discrete_x.
How would your approach be? Would you use for loop within a for loop?