code:

input over_bought = 80;
input over_sold = 20;
input KPeriod = 8;
input DPeriod = 5;
input priceH = high;
input priceL = low;
input priceC = close;
input slowing_period = 3;
input averageType = AverageType.SIMPLE;
input showBreakoutSignals = {default "No", "On FullK", "On FullD", "On FullK & FullD"};

input lowLookback = 8;
input FullDDipThreshold = 1;
input PriceDipThreshold = 0;

plot sfd = StochasticFull(over_bought, over_sold,  KPeriod,  DPeriod,  priceH,  priceL,  priceC,  slowing_period, averageType, showBreakoutSignals).FullD;
sfd.Hide();

def sfdMin = if (sfd[2] > sfd[1] and sfd[1] > sfd  and sfd[-1] > sfd) then sfd else Double.NaN;

plot lowestInRange = Lowest(low, lowLookback);
lowestInRange.Hide();

def lowStartingRange = low[lowLookback];

plot priceDip = if (!IsNaN(sfdMin) and lowestInRange != lowStartingRange) then lowestInRange else Double.NaN;
plot sfdDip = if (!IsNaN(sfdMin) and lowestInRange !=
lowStartingRange) then sfdMin else Double.NaN;
priceDip.Hide();
sfdDip.Hide();

def priorDipPrice = fold i = 1 to 100 with priorPriceDip = Double.NaN while IsNaN(priorPriceDip) do priceDip[i];
def priorDipStoch = fold j = 1 to 100 with priorStochDip =
Double.NaN while IsNaN(priorStochDip) do sfdDip[j];

plot buyNow = if (priorDipPrice - priceDip > PriceDipThreshold and sfdDip - priorDipStoch > FullDDipThreshold) then low else Double.NaN;
buyNow.SetPaintingStrategy(PaintingStrategy.ARROW_UP);