Bollinger Bands not reading correctly.

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Hello

I have an EA that is not calulating the bands correctly.

You can see on the attachment the difference in using the bands indicator in metatrader and the one in the EA, but the settings are the same.

Here is the code for the bands in the EA, the only thing I can think of is that the EA using ibands and the metatrader indicator is iMA.

Ps I am not an experienced coder.

double BB(string up_dn, int barback){int tf = 0;
   if(BandsSetArrow){
      double hi = iBands(Symbol(),Period(),BandsPeriod,BandsDeviation,0,PRICE_CLOSE,MODE_UPPER,1);
      double md = iMA   (Symbol(),Period(),BandsPeriod,0,0,PRICE_CLOSE,1);
      double lo = iBands(Symbol(),Period(),BandsPeriod,BandsDeviation,0,PRICE_CLOSE,MODE_LOWER,1);
      SetArrow(4,Teal,hi,"BB hi",Time[1]);
      SetArrow(4,Teal,md,"BB midle",Time[1]);
      SetArrow(4,Teal,lo,"BB lo",Time[1]);
   }
   if(up_dn == "up"){
      return(iBands(Symbol(),Period(),BandsPeriod,BandsDeviation,0,PRICE_CLOSE,MODE_UPPER,barback));
   }
   if(up_dn == "dn"){
      return(iBands(Symbol(),Period(),BandsPeriod,BandsDeviation,0,PRICE_CLOSE,MODE_LOWER,barback));
   }
   
}

Thank you

Antony

 
tonyjms2005:

Hello

I have an EA that is not calulating the bands correctly.

You can see on the attachment the difference in using the bands indicator in metatrader and the one in the EA, but the settings are the same.

Here is the code for the bands in the EA, the only thing I can think of is that the EA using ibands and the metatrader indicator is iMA.

Ps I am not an experienced coder.

Thank you

Antony

The middle line of the standard Bolling Bands indicator is a simple moving average. So your code looks just fine.

 

Hi

I meant to also attach a snapshot of the chart, but here is a link:

http://tributetothem.com/bands1.gif

You can see the problem with the bands reading incorrectly, the blue lines are the metatrader bands indicator which shows the true reading.

Perhaps for the lower and upper bands I should use iMA instead of ibands?

Thanks

Antony

 

Another point as well is, I think that its to do with the diviations as the middle band is correct but the outer bands are not and when I try to adjust the divations with a new input it does not respond.

Thanks

Antony

 

are you sure you have the mt4 bollinger bands set to the same periods, deviations and shift as your EA ?

 

Hi

Thanks for the reply.

The MT4 indicator is set:

period: 21

deviations: 1.8

shift: 0

The EA is set as above except for the shift, as I had a lot of help setting in it up from an experienced coder then I am slightly lost.

Thank you

Antony

 

Hi again

Right, I have found that the mt4 indicator is using iMA and my EA is using ibands.

How could I use iMA i the above coding rather than ibands, I have been trying to replace this but I get plenty of errors.

Can someone show me how it should be?

Thanks

Antony

 

Ibands is returning a deviation of one. Your indicator is set to 1.8

double hi = iBands(Symbol(),Period(),BandsPeriod,BandsDeviation,0,PRICE_CLOSE,MODE_UPPER,1);
double md = iMA   (Symbol(),Period(),BandsPeriod,0,MODE_SMA,PRICE_CLOSE,1);
double std= hi - md,
       lo = md - 1.8 * std;
       hi = md + 1.8 * std;
 

Hi

Brilliant you got it exact now thank you.

I am just recoding the lower part now so that the EA uses your method and I believe I require some more advice.

This is what I have tried unsuccessfully:

double BB(string up_dn, int barback){int tf = 0;
   if(BandsSetArrow){
      double hi = iBands(Symbol(),Period(),BandsPeriod,BandsDeviation,0,PRICE_CLOSE,MODE_UPPER,1);
      double md = iMA   (Symbol(),Period(),BandsPeriod,0,0,PRICE_CLOSE,1);
      double std= hi - md,
       lo = md - 1.8 * std;
       hi = md + 1.8 * std;
      SetArrow(4,Teal,hi,"BB hi",Time[1]);
      SetArrow(4,Teal,md,"BB midle",Time[1]);
      SetArrow(4,Teal,lo,"BB lo",Time[1]);
   }
   if(up_dn == "up"){ hi = md + 1.8 * std;
   }
   if(up_dn == "dn"){ lo = md - 1.8 * std;
   }
   
}

Can anyone show where I am going wrong?

Thank you

Antony

 

Hi

Looks like I got it worked out, can anyone confirm this is the correct way:

double BB(string up_dn, int barback){int tf = 0;
   if(BandsSetArrow){
       double hi = iBands(Symbol(),Period(),BandsPeriod,BandsDeviation,0,PRICE_CLOSE,MODE_UPPER,1);
      double md = iMA   (Symbol(),Period(),BandsPeriod,0,0,PRICE_CLOSE,1);
      double std= hi - md,
       lo = md - 1.8 * std;
       hi = md + 1.8 * std;
      SetArrow(4,Teal,hi,"BB hi",Time[1]);
      SetArrow(4,Teal,md,"BB midle",Time[1]);
      SetArrow(4,Teal,lo,"BB lo",Time[1]);
   }
   if(up_dn == "up"){
      return(md + 1.8 * std);
   }
   if(up_dn == "dn"){
      return(md - 1.8 * std);
   }
   
}

Thanks

Antony

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