Hi,
I need help again.

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int time2 = 5; //used timeframe
double derivation=2 ; // derivation
double Bollinger,BolValue;

Bollinger = iBands(NULL,0,4*time2,derivation,0,PRICE_TYPICAL,0 ,0);
BolValue = iBandsOnArray(array[],0,derivation,0,0,0);
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I am working on an EA. Now I need the BollingerBands as a filter for my signals.
How can i construct the real values of the BollingerBands as I see, when I drop the Indicator on the chart?
The first double called "Bollinger" seems to be the MA in the middle of the BBs.
So I think the "BolValue" is the pos. and neg. difference between the middle-MA and the Bands - right?
So, if thats right - what do i have to choose for ARRAY[] ?. If that must be loop or somethink, can someone tell me the whole loop?.

Doesn´t know anyone, how to use it?

Firstly, you should know the formula of BB:
- UpBB = MA(N) + deviation*StdDev(N)
- DnBB = MA(N) - deviation*StdDev(N)
where N - period of BB
Second, if you wish to receive difference between Upper and Lower bands(or BBWidth) then you should use the following formula:

BBWidth = UpBB - DnBB = 2*deviation*StdDev(N).

Standard Deviation(iStdDev(...)) you can find in the built-in indicators.

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the middle of the bollinger matches is the same as a MA try placing a SMA20 over a SMA20 bollinger band. the higher and lower boll value can be gotten with

iBands(NULL,0,20,2,0,PRICE_LOW,MODE_UPPER,0)
iBands(NULL,0,20,2,0,PRICE_LOW,MODE_LOWER,0)

so just take a SMA from the high, or the low from the SMA. hope that helps (i didnt really read the question.

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Thanks, that was it

I´m writing the code now, and i see, you have used "PRICE_LOW":

iBands(NULL,0,20,2,0,PRICE_LOW,MODE_UPPER,0)
iBands(NULL,0,20,2,0,PRICE_LOW,MODE_LOWER,0)

Can´t I choose PRICE_TYPICAL better?

yeah you can change to any price, the info i got was from the MT4 help file, as is;

iBands(symbol,timeframe,period,deviation,bands_shi ft,applied_price,mode,shift)

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