NMM

#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1 Magenta
#property indicator_color2 Silver
#property indicator_level1 0
#property indicator_levelcolor Gray
#property indicator_levelstyle 2

extern int     NMM_period  = 40;
extern bool    Show_SD     = true;
extern int     SD_len      = 30;
extern double  SD_up       = 2;
extern double  SD_dn       = 2;

double NMM[];
double SD[];

int init()
{
  string nmmname = "NMM(" + NMM_period + ")";
  string sdname = "NMM_SD(" + SD_len + ")";
  IndicatorShortName(nmmname);
  IndicatorBuffers(2);
  SetIndexBuffer(0, NMM);
  SetIndexLabel(0, nmmname);
  SetIndexBuffer(1, SD);
  SetIndexLabel(1, sdname);
  return(0);
}

int start()
{
  int limit, i, ii, counted_bars = IndicatorCounted();

  if(Bars <= NMM_period) return(0);
  if(counted_bars < 0) counted_bars = 0;
  if(counted_bars > NMM_period) limit = Bars - counted_bars;
  else                          limit = Bars - NMM_period - 1;

  for(i = limit; i >= 0; i--)
    {
    double nmm2 = 0;
    for(ii = 1; ii <= NMM_period; ii++)
      nmm2 += (MathLog(Close[i]) - MathLog(Close[i+ii])) / MathSqrt(ii);
    NMM[i] = (nmm2 / NMM_period)  * 1000;
    }

  if(Show_SD)
    for(i = limit; i >= 0; i--)
      if(i < Bars - NMM_period - 1 - SD_len)
        {
        if(NMM[i] == 0)     SD[i] = 0;
        else if(NMM[i] > 0) SD[i] = iBandsOnArray(NMM, 0, SD_len, SD_up, 0, MODE_UPPER, i);
        else if(NMM[i] < 0) SD[i] = iBandsOnArray(NMM, 0, SD_len, SD_dn, 0, MODE_LOWER, i);
        }

  return(0);
}