function Init()
    indicator:name("Kaufman RSI");
    indicator:description("Kaufman RSI");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
   
    indicator.parameters:addInteger("periodAMA", "periodAMA", "period of AMA", 10);
    indicator.parameters:addInteger("nfast", "nfast", "nfast", 2);
    indicator.parameters:addInteger("nslow", "nslow", "nslow", 10);
    indicator.parameters:addDouble("G", "G", "G", 4);
    indicator.parameters:addDouble("dK", "dK", "dK", 450);
    indicator.parameters:addInteger("RSI", "RSI", "RSI", 200);

    indicator.parameters:addColor("clr1", "Color of RSI_K", "Color of RSI_K", core.rgb(0, 255, 0));
    indicator.parameters:addColor("clr2", "Color of RSI", "Color of RSI", core.rgb(255, 0, 0));
    indicator.parameters:addColor("clr3", "Up Color", "Up Color", core.rgb(0, 0, 255));
    indicator.parameters:addColor("clr4", "Dn Color", "Dn Color", core.rgb(0, 255, 255));
end

local first;
local source = nil;
local periodAMA;
local nfast;
local nslow;
local G;
local dK;
local RSI;
local RSI_Ind;
local buff1;
local buff2;
local buff3;
local buff4;
local AMA0;

function Prepare()
    source = instance.source;
    periodAMA=instance.parameters.periodAMA;
    nfast=instance.parameters.nfast;
    nslow=instance.parameters.nslow;
    G=instance.parameters.G;
    dK=instance.parameters.dK;
    RSI=instance.parameters.RSI;
    RSI_Ind = core.indicators:create("RSI", source, RSI);
    first = RSI_Ind.DATA:first()+2;
    local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.periodAMA .. ", " .. instance.parameters.nfast .. ", " .. instance.parameters.nslow .. ", " .. instance.parameters.G .. ", " .. instance.parameters.dK .. ", " .. instance.parameters.RSI .. ")";
    instance:name(name);
    buff1 = instance:addStream("buff1", core.Line, name .. ".RSI_K", "RSI_K", instance.parameters.clr1, first);
    buff2 = instance:addStream("buff2", core.Line, name .. ".RSI", "RSI", instance.parameters.clr2, first);
    buff3 = instance:createTextOutput ("Up", "Up", "Wingdings", 10, core.H_Center, core.V_Center, instance.parameters.clr3, first);
    buff4 = instance:createTextOutput ("Dn", "Dn", "Wingdings", 10, core.H_Center, core.V_Center, instance.parameters.clr4, first);
end

function Update(period, mode)
    RSI_Ind:update(mode);
    if (period>first+periodAMA) then
     local slowSC=2./(nslow+1.);
     local fastSC=2./(nfast+1.);
     buff2[period]=RSI_Ind.DATA[period];
     local signal=math.abs(RSI_Ind.DATA[period]-RSI_Ind.DATA[period-periodAMA]);
     local noise=0.000000001;
     for i=period-periodAMA+1,period,1 do
      noise=noise+math.abs(RSI_Ind.DATA[i]-RSI_Ind.DATA[i-1]);
     end
     local ER=signal/noise;
     local dSC=fastSC-slowSC;
     local ERSC=ER*dSC;
     local SSC=ERSC+slowSC;
     local AMA=AMA0+math.pow(SSC,G)*(RSI_Ind.DATA[period]-AMA0);
     buff1[period]=AMA;
     local ddK=AMA-AMA0;
     if math.abs(ddK)>dK*source:pipSize() and ddK>0. then
      buff3:set(period, AMA, "\159", "");
     end
     if math.abs(ddK)>dK*source:pipSize() and ddK<0. then
      buff4:set(period, AMA, "\159", "");
     end
     AMA0=AMA;
    else
     AMA0=RSI_Ind.DATA[period-1];
    end
end