Ehlers Reverse EMA

ÿþ//+------------------------------------------------------------------+ 

//|                      Ehlers Reverse EMA                          | 

//+------------------------------------------------------------------+ 

#property description "Code by Max Michael 2023"

#property  indicator_separate_window

#property  indicator_buffers 2

#property  indicator_color1  clrAqua

#property  indicator_width1  1

#property  indicator_level1  0

#property  indicator_levelcolor DarkSlateGray

#property  indicator_levelstyle STYLE_SOLID

#property  strict



extern double    Alpha = 0.1;

extern int     maxbars = 500;



double Main[], ema[], re1[2],re2[2],re3[2],re4[2],re5[2],re6[2],re7[2],re8[2];



int init()

{

   SetIndexBuffer(0,Main); SetIndexStyle(0,DRAW_LINE); SetIndexEmptyValue(0,0);

   SetIndexBuffer(1,ema ); SetIndexStyle(1,DRAW_NONE); SetIndexEmptyValue(1,0);

   IndicatorShortName("Ehlers Reverse EMA ("+string(Alpha)+")");

   if(maxbars > Bars-1) maxbars=Bars-1;

   IndicatorDigits(Digits);

   return(0);

}



void deinit() { }



int start()

{   

   int counted_bars=IndicatorCounted();

   if(counted_bars<0) return(-1);

   if(counted_bars>0) counted_bars--;

   int limit=fmin(Bars-counted_bars-2,maxbars);

   double delta = 1-Alpha;

   

   for(int i=limit; i>=0; i--)

   {

       ema[i] = Alpha * Close[i]+ delta * ema[i+1];

       re1[0] = delta * ema[i] + ema[i+1];

       re2[0] = MathPow(delta,2)  * re1[0]+ re1[1]; 

       re3[0] = MathPow(delta,4)  * re2[0]+ re2[1]; 

       re4[0] = MathPow(delta,8)  * re3[0]+ re3[1]; 

       re5[0] = MathPow(delta,16) * re4[0]+ re4[1]; 

       re6[0] = MathPow(delta,32) * re5[0]+ re5[1]; 

       re7[0] = MathPow(delta,64) * re6[0]+ re6[1]; 

       re8[0] = MathPow(delta,128)* re7[0]+ re7[1]; 

       if(i>0) { re1[1]=re1[0]; re2[1]=re2[0]; re3[1]=re3[0]; re4[1]=re4[0]; re5[1]=re5[0]; re6[1]=re6[0]; re7[1]=re7[0]; }

       if(i<maxbars-75) Main[i]=ema[i] - Alpha * re8[0]; // some bars required to initialize calculation

   }

   return(0);

}