Bollinger band w/ extention

[frankthefrogking]

Was looking for A Bollinger band with extension added to the end of the line. I tired making one off a moving average prediction crossover but couldn't get the code right.

 

[halcyonguy]

Was looking for A Bollinger band with extension added to the end of the line. I tired making one off a moving average prediction crossover but couldn't get the code right.

# bolingerbands_extlines
# Charles Schwab & Co. (c) 2007-2024

input price = close;
input displace = 0;
input length = 20;
input Num_Dev_Dn = -2.0;
input Num_Dev_up = 2.0;
input averageType = AverageType.Simple;

def sDev2 = stdev(data = price[-displace], length = length);
def sdev = if isnan(close) then sdev[1] else sdev2;

def MidLine3 = MovingAverage(averageType, data = price[-displace], length = length);
def midline2 = if isnan(close) then midline2[1] else midline3;

plot midline = midline2;
plot LowerBand = MidLine + num_Dev_Dn * sDev;
plot UpperBand = MidLine + num_Dev_Up * sDev;

LowerBand.SetDefaultColor(GetColor(0));
MidLine.SetDefaultColor(GetColor(1));
UpperBand.SetDefaultColor(GetColor(5));
#