Try to count the number of positions that you have openend every day. For example, set a parameter np to 0 every day at 0:00. When you open a new position, increase np by 1.

Then you can consider positionperf only for the number that np is currently showing.

For example, when np is 2, and a position is open, you consider only positionperf and positionperf(1). When no position is open, you consider only positionperf(1) and positionperf(2).

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Juan Salas, robertogozzi