//+------------------------------------------------------------------+
//|                                               _i_EF_distance.mq4 |
//|                                     Copyright © 2006, Doji Starr |
//|                                                                  |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2006, Doji Starr"

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Aqua



// input params
extern int Length = 10;
extern double Power = 2;

// vars
int i, c, startBar;
double coef, norm;

// buffers
double buf_el[], buf_co[];



//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{
    IndicatorBuffers(2);
    SetIndexBuffer(0,buf_el);
    SetIndexStyle(0,DRAW_LINE);
    SetIndexBuffer(1,buf_co);

    return(0);
}

//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
{
    return(0);
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
    if (Bars <= Length)
        return(0);
        
    int bar;
    int counted_bars = IndicatorCounted();
    
    if (counted_bars < 1)
    {
        // filling initial values in buffers
        for (bar=Bars-1; bar>=Bars-Length*2; bar--)
        {
            buf_el[bar] = Close[bar];
            buf_co[bar] = 0.0;
        }
        startBar = Bars-Length*2-1;
    }
    else
        startBar = Bars-counted_bars-1;

    for (bar=startBar; bar>=0; bar--)
    {
        buf_co[bar] = 0.0;
        for (i=Length-1; i>=0; i--)
            buf_co[bar] += MathAbs(MathPow(Close[bar]-Close[bar+i], Power));

        norm = 0.0;
        buf_el[bar] = 0.0;
        for (i=Length-1; i>=0; i--)
        {
            norm += buf_co[bar+i];
            buf_el[bar] += buf_co[bar+i] * Close[bar+i];
        }
        if (norm != 0)
            buf_el[bar] /= norm;
        else
            buf_el[bar] = 0.0;
//Print(norm);        
    }
    
    return(0);
}