indicator that looks at its own turning points to decide its length?

[MisterH]

 Hi, say you want to change the window length of your indicator to the number of bars since its last turning point, you would do that like this:

 

   for(int i=0; i<limit; i++)
   {    
   ExtMapBuffer0[i]=iMA(0,0,10,0,0,0,i);
   }

   for(i=limit-1; i>=0; i--)
   { 
  
   double curr = ExtMapBuffer0[i]; //current value
   double prev = ExtMapBuffer0[i+1]; //previous value
   double pprev =ExtMapBuffer0[i+2]; //before previous value
   
   if (i > Bars-3 || pprev == EMPTY_VALUE) { TurningPointBuffer[i] = 0; continue; }
    
   int shift = i + 2;
   while (pprev == prev)
      {
      shift++;
      if (shift > Bars-1 || ExtMapBuffer0[shift] == EMPTY_VALUE) break;
      pprev = ExtMapBuffer0[shift];
      }
   
   if ((curr < prev && prev > pprev) || (curr > prev && prev < pprev))
      TurningPointBuffer[i] = 1;
   else
      TurningPointBuffer[i] = TurningPointBuffer[i+1]+1; 
   }

and then code another buffer for the SMA taking TurningPointBuffer[i] as the length parameter. But this only returns you a SMA with window length equal to the number of bars since a turn of a SMA(10) because I set it at iMA(0,0,10,0,0,0,i);. How would you approach it to make it turn since its own turning point? What I mean is count the number of bars of this new "hybrid" SMA that turns based on a window length since its own last turn? So it looks at its own turning points to decide its length?

[William Roeder]

Find the last two turning points, that becomes your length. Compute iMA(length,iBar) iBar from the last turning point-1 to current bar.