The above example calculates the historical position profit and loss, not the historical profit and loss you understand. Historical gains and losses are calculated according to your calculation method.

Today's profit and loss = today's liquidation profit and loss+historical position profit and loss. Historical position profit and loss = (today's settlement price-yesterday's settlement price) * number of positions.

You can calculate the balance of the settlement reserve for the day as follows: initial investment in the account+total amount of money you earn-the deposit occupied by the position on the day.

You can use your historical profit and loss+two liquidation profits and losses to calculate the total amount of money you earn.