I am new to this language ( mql4 ) and so forgive me for my errors 
With Prorealtime I have created this indicator ( a sort of autoenevelope bands ) :
where
factor = 27
This is my try with mql4 :
The indicator returns only the EMA, but don't the bands.
Possible errors ?
Writing High[x] and Low[x], MT4 does calcolate the low and the high of the candle ?
Thanks for any help
With Prorealtime I have created this indicator ( a sort of autoenevelope bands ) :
Inserted Code
mov=ExponentialAverage[20](close) b=abs(high-mov) c=abs(low-mov) d=max(b,c) e=(2*d)/mov f=STD[100](e) g=(f*factor)/10 h=g*mov upperband=mov+h/2 lowerband=mov-h/2 RETURN mov, upperband, lowerband
where
factor = 27
This is my try with mql4 :
Inserted Code
//+------------------------------------------------------------------+
//| autoenvelope bands.mq4 |
//| |
//| Copyright |
//| http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright "
#property link "http://"
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
#property indicator_chart_window
#property indicator_buffers 3
#property indicator_color1 White
#property indicator_color2 White
#property indicator_color3 White
double upper[], middle[], lower[];
extern int MA_PERIOD = 20;
extern int MA_MODE = 0;
extern int PRICE_MODE = 5;
extern int factor = 27;
double b;
double c;
double d;
double e;
double f;
double g;
double h;
int init()
{
SetIndexStyle(0,DRAW_LINE);
SetIndexShift(0,0);
SetIndexDrawBegin(0,0);
SetIndexBuffer(0,upper);
SetIndexStyle(1,DRAW_LINE,STYLE_DOT);
SetIndexShift(1,0);
SetIndexDrawBegin(1,0);
SetIndexBuffer(1,middle);
SetIndexStyle(2,DRAW_LINE);
SetIndexShift(2,0);
SetIndexDrawBegin(2,0);
SetIndexBuffer(2,lower);
//---- indicators
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start() {
int limit;
int counted_bars=IndicatorCounted();
if(counted_bars<0) return(-1);
if(counted_bars>0) counted_bars--;
limit=Bars-counted_bars;
for(int x=0; x<limit; x++) {
middle[x] = iMA(NULL, 0, MA_PERIOD, 0, MA_MODE, PRICE_MODE, x);
b = MathAbs(High[x]-middle[x]);
c = MathAbs(Low[x]-middle[x]);
d=MathMax(b,c);
e=(2*d)/middle[x];
f=iStdDev(e,0,100,0,MODE_EMA,0,x);
g=(f*factor)/10;
h=g*middle[x];
upper[x] = middle[x] + h/2;
lower[x] = middle[x] - h/2;
}
return(0);
} The indicator returns only the EMA, but don't the bands.
Possible errors ?
Inserted Code
b = MathAbs(High[x]-middle[x]);
c = MathAbs(Low[x]-middle[x]); Writing High[x] and Low[x], MT4 does calcolate the low and the high of the candle ?
Thanks for any help
