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Bollinger Bands with EMA
Source: https://fxcodebase.com/code/viewtopic.php?f=17&t=679
Forum: 17 · Topic 679 · 4 post(s)
Bollinger Bands with EMA
Alexander.Gettinger · Fri Apr 16, 2010 5:31 pm
Original Bollinger Bands with an EMA instead of a simple ma.
MiddleLine = EMA(N) TopLile = MiddleLine + (D * StdDev) BottomLine = MiddleLine — (D * StdDev) D - standard deviations.
Code: Select all `function Init() indicator:name(“Bollinger Bands with EMA”); indicator:description(“Original Bollinger Bands with an EMA instead of a simple ma”); indicator:requiredSource(core.Tick); indicator:type(core.Indicator);
indicator.parameters:addDouble(“N”, “Number of periods”, “Number of periods”, 20.0); indicator.parameters:addDouble(“Dev”, “Number of standard deviations”, “Number of standard deviations”, 2.0); indicator.parameters:addColor(“clrBBP”, “clrBBP”, “clrBBP”, core.rgb(255, 0, 0)); indicator.parameters:addColor(“clrBBM”, “clrBBM”, “clrBBM”, core.rgb(0, 255, 0)); indicator.parameters:addColor(“clrBBA”, “clrBBA”, “clrBBA”, core.rgb(0, 0, 255)); end
local N; local D;
local first; local source = nil;
local TL = nil; local BL = nil;
local MA=nil;
– Routine function Prepare() N = instance.parameters.N; D = instance.parameters.Dev; source = instance.source; first = source:first()+N-1;
local name = “Bollinger Bands with EMA (“ .. N .. “, “ .. D .. “)”; instance:name(name); MA = core.indicators:create(“EMA”, source, N); TL = instance:addStream(“TL”, core.Line, name .. “.TL”, “TL”, instance.parameters.clrBBP, first) BL = instance:addStream(“BL”, core.Line, name .. “.BL”, “BL”, instance.parameters.clrBBM, first) AL = instance:addStream(“AL”, core.Line, name .. “.AL”, “AL”, instance.parameters.clrBBA, first) end
– Indicator calculation routine function Update(period,mode) MA:update(mode); if(period >= first) then local ml=MA.DATA[period]; local d = core.stdev(source, core.rangeTo(period, N)); TL[period] = ml + D * d; BL[period] = ml - D * d; AL[period] = ml; end end`
Re: Bollinger Bands with EMA
Thecity · Sun Apr 26, 2015 2:54 pm
Could you add all the grafic options like the standard bollinger bands, please? Thanks in advance.
Re: Bollinger Bands with EMA
Apprentice · Mon Apr 27, 2015 2:44 am
Style Option Added.
Re: Bollinger Bands with EMA
Apprentice · Fri Oct 19, 2018 4:12 am
The indicator was revised and updated.