Scan for premarket low to high percent change

You only need to remove the original plot statements and one new line of code in order to convert that solution to work as a scan. Everything is already there. You need to create a statement that checks if the current high is greater than or equal to the target price.

Here is the scan:

# adjust to set the target value for pre session high
input percentMultiplier = 0.90;
input premarketStart = 400;
input sessionStartTime = 930;
input sessionEndTime = 1615;
def regularSessionHours = SecondsFromTime(sessionStartTime) >= 0 and SecondsTillTime(sessionEndTime) >= 0;
def extendedSessionHours = !regularSessionHours;
def trackPremarket = SecondsFromTime(premarketStart) >= 0 and SecondsTillTime(sessionEndTime) > 0 and extendedSessionHours;
rec premarketLow = if !regularSessionHours[1] and regularSessionHours then Double.NaN else if !trackPremarket[1] and trackPremarket then low else if low > 0 and trackPremarket then Min(low, premarketLow[1]) else premarketLow[1];
rec targetPrice = if regularSessionHours then Double.NaN else if !trackPremarket[1] and trackPremarket then premarketLow * percentMultiplier + premarketLow else targetPrice[1];
plot scan = trackPremarket and high >= targetPrice;

This scan will only work during the premarket hours. Once the regular session begins, the scan will produce zero results.