Closing positions is not necessarily the same as opening positions. For example, if you open a 10 hand, you can close the position in several times. Number of positions opened = number of positions closed+number of positions held.

B means to buy, and S means to sell.

The calculation of active trading depends on the price of your transaction, while consideration trading is active and queuing trading is passive.

Instead of calculating the opening and closing positions, only the unilateral position of the stock index is calculated, so the trading volume only calculates the opening and closing positions in one direction, and the position difference is the position held at the last moment-the position held at this moment.

Give too few points.