Please help me understand the calculation mechanics of indicator | Forex Factory

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Please help me understand the calculation mechanics of indicator

  • #1
  • First Post: Jul 18, 2014 3:40am Jul 18, 2014 3:40am
The basic formula of EMA Calculation is that first we calculate the exponent e.g. for 20 days 2(20+1) and then we calculate the 20 day average. We use the following formula (Current Day Close+Exponent+Previous Day EMA*(1-Exponent) which returns the EMA value. This formula is a bit modified and I am unable to understand how it sometimes does not generate EMA signal. I have noticed it has got Range & Average Range calculation in it which I am unable to comprehend. Formula pasted below for reference.

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 SpringGreen
#property indicator_color2 Red
double CrossUp[];
double CrossDown[];
extern int FasterEMA = 5;
extern int SlowerEMA = 6;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- indicators
SetIndexStyle(0, DRAW_ARROW, EMPTY);
SetIndexArrow(0, 233);
SetIndexBuffer(0, CrossUp);
SetIndexStyle(1, DRAW_ARROW, EMPTY);
SetIndexArrow(1, 234);
SetIndexBuffer(1, CrossDown);
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start() {
int limit, i, counter;
double fasterEMAnow, slowerEMAnow, fasterEMAprevious, slowerEMAprevious, fasterEMAafter, slowerEMAafter;
double Range, AvgRange;
int counted_bars=IndicatorCounted();
//---- check for possible errors
if(counted_bars<0) return(-1);
//---- last counted bar will be recounted
if(counted_bars>0) counted_bars--;
limit=Bars-counted_bars;

for(i = 0; i <= limit; i++) {

counter=i;
Range=0;
AvgRange=0;
for (counter=i ;counter<=i+9;counter++) {
AvgRange=AvgRange+MathAbs(High[counter]-Low[counter]);
}
Range=AvgRange/10;

fasterEMAnow = iMA(NULL, 0, FasterEMA, 0, MODE_LWMA, PRICE_CLOSE, i);
fasterEMAprevious = iMA(NULL, 0, FasterEMA, 0, MODE_LWMA, PRICE_CLOSE, i+1);
fasterEMAafter = iMA(NULL, 0, FasterEMA, 0, MODE_LWMA, PRICE_CLOSE, i-1);
slowerEMAnow = iMA(NULL, 0, SlowerEMA, 0, MODE_LWMA, PRICE_CLOSE, i);
slowerEMAprevious = iMA(NULL, 0, SlowerEMA, 0, MODE_LWMA, PRICE_CLOSE, i+1);
slowerEMAafter = iMA(NULL, 0, SlowerEMA, 0, MODE_LWMA, PRICE_CLOSE, i-1);

if ((fasterEMAnow > slowerEMAnow) && (fasterEMAprevious < slowerEMAprevious) && (fasterEMAafter > slowerEMAafter)) {
CrossUp[i] = Low[i] - Range*0.5;
}
else if ((fasterEMAnow < slowerEMAnow) && (fasterEMAprevious > slowerEMAprevious) && (fasterEMAafter < slowerEMAafter)) {
CrossDown[i] = High[i] + Range*0.5;
}
}
return(0);
}
  • #2
  • Jul 18, 2014 4:35am Jul 18, 2014 4:35am
it is a moving average crossover indicator

if (fastEMA currentcandle > slowEMA currentcandle && fastEMA candlebefore < slowEMA candleBefore) ...

the range-stuff is for the bufferpips for the arrows (e.g. low of candle + 0.5*RangePips)

but the indicator seem to look into the future - (e.g. fastEMA after), that is a bug ...
PM me with coding requests and I'll probably put you on my ignore list
  • #3
  • Jul 18, 2014 4:58am Jul 18, 2014 4:58am
Quoting fxdaytrader_
it is a moving average crossover indicator if (fastEMA currentcandle > slowEMA currentcandle && fastEMA candlebefore < slowEMA candleBefore) ... the range-stuff is for the bufferpips for the arrows (e.g. low of candle + 0.5*RangePips) but the indicator seem to look into the future - (e.g. fastEMA after), that is a bug ...
Thanks man. I basically need to know how does it exactly calculate buffer pips to generate buy / sell signals because at times ema crossover occurs but buy / sell signal is not generated.
  • #4
  • Jul 18, 2014 6:24am Jul 18, 2014 6:24am
Quoting iwishtowin
{quote} Thanks man. I basically need to know how does it exactly calculate buffer pips to generate buy / sell signals because at times ema crossover occurs but buy / sell signal is not generated.
again: The bufferpips have nothing to do with the generation of the signals. signals occur on ma crosses.

this works (pls. see attached, alerts also added):


Inserted Code
 
#property copyright "?, mod. fxdaytrader, http://ForexBaron.net"
#property link      "http://ForexBaron.net"
#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 SpringGreen
#property indicator_color2 Red
double CrossUp[];
double CrossDown[];
extern int FasterEMAPeriod = 5;
extern int FasterEMAShift  = 0;
extern int FasterEMAMethod = MODE_LWMA;
extern int FasterEMAPrice  = PRICE_CLOSE;
//
extern string masep0="";
//
extern int SlowerEMAPeriod = 6;
extern int SlowerEMAShift  = 0;
extern int SlowerEMAMethod = MODE_LWMA;
extern int SlowerEMAPrice  = PRICE_CLOSE;
//
extern string ahi="******* ALERT SETTINGS:";//new alert stuff, fxdaytrader
extern int    AlertCandle            = 1;//0:current, 1:last bar, etc.
extern bool   UpAlerts               = true;
extern bool   DownAlerts             = true;
extern bool   PopupAlerts            = true;
extern bool   EmailAlerts            = false;
extern bool   PushNotificationAlerts = false;
extern bool   SoundAlerts            = false;
extern string SoundFileLong          = "alert.wav";
extern string SoundFileShort         = "alert2.wav";
extern string ahi1="******* MISC SETTINGS:";
extern bool   ShowArrows = TRUE;
extern double ArrowDistanceMutliplier = 0.5;//change distance price-arrows, fxdaytrader
extern int    UpArrowSign = 233;
extern int    DownArrowSign = 234;
int lastAlert = 3;
 
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   if (ShowArrows) SetIndexStyle(0, DRAW_ARROW, EMPTY,1);
    else if (!ShowArrows) SetIndexStyle(0, DRAW_NONE, EMPTY,1);
   SetIndexArrow(0, UpArrowSign);
   SetIndexBuffer(0, CrossUp);
   if (ShowArrows) SetIndexStyle(1, DRAW_ARROW, EMPTY,1);
    else if (!ShowArrows) SetIndexStyle(1, DRAW_NONE, EMPTY,1);
   SetIndexArrow(1, DownArrowSign);
   SetIndexBuffer(1, CrossDown);
   SetIndexLabel(1,"MA CROSS DOWN");
   SetIndexLabel(0,"MA CROSS UP");
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start() {
   int limit, i, counter;
   double fastma,slowma,fastmab4,slowmab4;
   double Range, AvgRange;
   int counted_bars=IndicatorCounted();
//---- check for possible errors
   if(counted_bars<0) return(-1);
//---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
  
   for(i = 0; i <= limit; i++) {
      counter=i;
      Range=0;
      AvgRange=0;
      for (counter=i;counter<=i+9;counter++) AvgRange=AvgRange+MathAbs(High[counter]-Low[counter]);
      Range=AvgRange/10;
      fastma   = iMA(NULL, 0, FasterEMAPeriod, FasterEMAShift, FasterEMAMethod, FasterEMAPrice, i);
      fastmab4 = iMA(NULL, 0, FasterEMAPeriod, FasterEMAShift, FasterEMAMethod, FasterEMAPrice, i+1);
      slowma   = iMA(NULL, 0, SlowerEMAPeriod, SlowerEMAShift, SlowerEMAMethod, SlowerEMAPrice, i);
      slowmab4 = iMA(NULL, 0, SlowerEMAPeriod, SlowerEMAShift, SlowerEMAMethod, SlowerEMAPrice, i+1);
      
    
      if ((fastma > slowma) && (fastmab4 <= slowmab4)) {
        if (lastAlert!=1 && i==AlertCandle) { if (UpAlerts) doAlerts("BUY SIGNAL",SoundFileLong); lastAlert=1; }
        CrossUp[i] = Low[i] - Range*ArrowDistanceMutliplier;
        Print(" **** UP CROSS i="+i);
      }
      else if ((fastma < slowma) && (fastmab4 >= slowmab4)) {
          if (lastAlert!=2 && i==AlertCandle) { if (DownAlerts) doAlerts("SELL SIGNAL",SoundFileShort); lastAlert=2; }
          CrossDown[i] = High[i] + Range*ArrowDistanceMutliplier;
          Print(" **** DN CROSS i="+i);
      }
  }//for(i = 0; i <= limit; i++) {
   return(0);
}
void doAlerts(string msg,string SoundFile) {
        msg="Ma Cross Alert on "+Symbol()+", period "+TFtoStr(Period())+": "+msg;//+", bid = "+DoubleToStr(MarketInfo(Symbol(),MODE_BID),Digits)+", servertime: "+TimeToStr(TimeCurrent());
 string emailsubject="MT4 alert on acc. "+AccountNumber()+", "+WindowExpertName()+" - Alert on "+Symbol()+", period "+TFtoStr(Period());
  if (PopupAlerts) Alert(msg);
  if (EmailAlerts) SendMail(emailsubject,msg);
  if (PushNotificationAlerts) SendNotification(msg);
  if (SoundAlerts) PlaySound(SoundFile);
}//void doAlerts(string msg,string SoundFile) {
string TFtoStr(int period) {
 if (period==0) period=Period();
 switch(period) {
  case 1     : return("M1");  break;
  case 5     : return("M5");  break;
  case 15    : return("M15"); break;
  case 30    : return("M30"); break;
  case 60    : return("H1");  break;
  case 240   : return("H4");  break;
  case 1440  : return("D1");  break;
  case 10080 : return("W1");  break;
  case 43200 : return("MN1"); break;
  default    : return(DoubleToStr(period,0));
 }
 return("UNKNOWN");
}//string TFtoStr(int period) {

if the indicator does not compile with the latest builds you will have to use the build 509 metaeditor/compiler (or use the attached .ex4 only)
Attached File(s)
File Type: ex4 ~~some MAcross Indicator.ex4   6 KB | 451 downloads
PM me with coding requests and I'll probably put you on my ignore list
  • #5
  • Jul 19, 2014 12:49am Jul 19, 2014 12:49am
Quoting fxdaytrader_
{quote} again: The bufferpips have nothing to do with the generation of the signals. signals occur on ma crosses. this works (pls. see attached, alerts also added): #property copyright "?, mod. fxdaytrader, http://ForexBaron.net" #property link "http://ForexBaron.net" #property indicator_chart_window #property indicator_buffers 2 #property indicator_color1 SpringGreen #property indicator_color2 Red double CrossUp[]; double CrossDown[]; extern int FasterEMAPeriod = 5; extern int FasterEMAShift = 0; extern int FasterEMAMethod = MODE_LWMA; extern int...

Alright thanks man
  • #6
  • Last Post: Nov 12, 2015 9:16pm Nov 12, 2015 9:16pm
Hello all!

I am having some trouble and I was wondering if someone could help. I have a custom indicator that I want to input into an EA, but the problem is that I don't know the parameters as to what makes this particular custom indicator paint it's buy/sell arrows. I know it has something to do with 2 EMA's, RSI and another simple custom indicator, but the exact conditions escape me.

Is there any way to look at the code and be able to determine these exact conditions and parameters so that I can customize my EA better?

I have attached the mql4 file for reference.

Thank you!

Tim
Attached File(s)
File Type: mq4 PipScalper_lime_red.mq4   7 KB | 314 downloads
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