def newWeek = GetWeek() <> GetWeek()[1];
rec priorWeeklyClose = if newWeek then close[1] else priorWeeklyClose[1];
def dailyCloseCondition = close < priorWeeklyClose;
def dayOfWeek = GetDayOfWeek(GetYYYYMMDD());
def belowWeeklyClose;
if dayOfWeek == 1 {
    belowWeeklyClose = dailyCloseCondition;
} else {
    if dayOfWeek == 2 {
        belowWeeklyClose = Lowest(dailyCloseCondition, 2) > 0;
    } else {
        if dayOfWeek == 3 {
            belowWeeklyClose = Lowest(dailyCloseCondition, 3) > 0;
        } else {
            if dayOfWeek == 4 {
                belowWeeklyClose = Lowest(dailyCloseCondition, 4) > 0;
            } else {
                belowWeeklyClose = Lowest(dailyCloseCondition, 5) > 0;
            }
        }
    }
}
plot scan = belowWeeklyClose;