how to use _point for multicurrency expert advisor?

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Hi, usually I use _point for calculating my risk and lot sizing

here's an example:

   //initialize Scaling Lot
   double balance 	= AccountInfoDouble(ACCOUNT_BALANCE);	//get account balance
   double percentlot 	= balance*RiskPerDay/Stoploss*_Point;	//math for risk calculation
   percentlot		= NormalizeDouble(percentlot,2);	//set 2 decimal point for lot size

this work fine when using only 1 currency pair.

But currently I am working to combine all my expert advisor which consist of multiple different currency pair 
and this particular problem is stopping me from progress 

Looking for advice from seasoned coder that perhaps experienced this problem also ;)

 
M. Amir:

Hi, usually I use _point for calculating my risk and lot sizing

here's an example:

this work fine when using only 1 currency pair.

But currently I am working to combine all my expert advisor which consist of multiple different currency pair 
and this particular problem is stopping me from progress 

Looking for advice from seasoned coder that perhaps experienced this problem also ;)

With SymbolInfoInteger and SYMBOL_DIGITS you can query this information.

Using MathPow, you calculate the factor, and then you save it in a variable for later use.
 
Dominik Egert #:
With SymbolInfoInteger and SYMBOL_DIGITS you can query this information.

Using MathPow, you calculate the factor, and then you save it in a variable for later use.

I don't understand what you trying to say but I get the gist of it.

here I used SymbolInfoDouble instead

Thanks anyway now I know these functions exist :)

   //initialize Scaling Lot
   double balance               = AccountInfoDouble(ACCOUNT_BALANCE);
   double point                 = SymbolInfoDouble("EURUSD",SYMBOL_POINT);
   double percentlot            = balance*RiskPerDay/Stoploss*point;
   percentlot                   = NormalizeDouble(percentlot,2);
 
  1. M. Amir: this work fine when using only 1 currency pair.

    Correct. The Predefined Variables are only for the current pair. Either, get the value(s) for the pair that you want.

  2. M. Amir: hich consist of multiple different currency pair 

    Or stop creating your own problems. I recommend: Do not trade multiple currencies in one EA.

    1. You can't use any {MT4: predefined variables, MT5: predefined variables,}

    2. A multi-asset EA runs in one thread so that one asset blocks all the others while each EA for a single asset runs in its own thread,

    3. Must poll (not OnTick, unless you use specific indicators)
                The Implementation of a Multi-currency Mode in MetaTrader 5 - MQL5 Articles (2011)

    4. and usually other problems, e.g. A problem with iBarShift - MQL4 programming forum - Page 2 (2016)

    5. You must handle History {MT4:4066/4073 errors: Download history in MQL4 EA - MQL4 programming forum, MT5: Timeseries and Indicators Access /  Data Access - Reference on algorithmic/automated trading language for MetaTrader 5.}

    6. Code it to trade the chart pair only. Look at the others if you must. Don't assume that Time[i] == iTime(otherPair, TF, i) always use iBarShift.

    Then put it on other charts to trade the other pairs. Done. 

  3.  double percentlot 	= balance*RiskPerDay/Stoploss*_Point;	//math for risk calculation

    That is not a valid calculation.

    Risk depends on your initial stop loss, lot size, and the value of the symbol. It does not depend on margin or leverage. No SL means you have infinite risk (on leveraged symbols). Never risk more than a small percentage of your trading funds, certainly less than 2% per trade, 6% total.

    1. You place the stop where it needs to be — where the reason for the trade is no longer valid. E.g. trading a support bounce, the stop goes below the support. Then you compute your lot size.

    2. AccountBalance * percent/100 = RISK = OrderLots * (|OrderOpenPrice - OrderStopLoss| * DeltaPerLot + CommissionPerLot) (Note OOP-OSL includes the spread, and DeltaPerLot is usually around $10/PIP, but it takes account of the exchange rates of the pair vs. your account currency.)

    3. Do NOT use TickValue by itself - DeltaPerLot and verify that MODE_TICKVALUE is returning a value in your deposit currency, as promised by the documentation, or whether it is returning a value in the instrument's base currency.
                MODE_TICKVALUE is not reliable on non-fx instruments with many brokers - MQL4 programming forum (2017)
                Is there an universal solution for Tick value? - Currency Pairs - General - MQL5 programming forum (2018)
                Lot value calculation off by a factor of 100 - MQL5 programming forum (2019)

    4. You must normalize lots properly and check against min and max.

    5. You must also check Free Margin to avoid stop out

    6. For MT5, see 'Money Fixed Risk' - MQL5 Code Base (2017)

    Most pairs are worth about $10 per PIP. A $5 risk with a (very small) 5 PIP SL is $5/$10/5 or 0.1 Lots maximum.

 
Your topic has been moved to the section: Expert Advisors and Automated Trading — Please consider which section is most appropriate — https://www.mql5.com/en/forum/172166/page6#comment_49114893
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