Lot Size Management
//+------------------------------------------------------------------+ //| Lot size computation. | //+------------------------------------------------------------------+ void OnInitLotSize(){ at.risk.equity = 0; at.risk.chart = 0; } double LotSize(double risk){ /*double at.risk.new; // Export to init/start // at.risk.equity // Import from ModifyStops //double at.risk.chart; // Import from ModifyStops //int op.code; // OP_BUY/OP_SELL // Import from SetDIR */ /* This function computes the lot size for a trade. * Explicit inputs are SL relative to bid/ask (E.G. SL=30*points,) * Implicit inputs are the MM mode, the MM multiplier, count currently * filled orders by all EA's vs this EA/pair/period count and history. * Implicit inputs are all used to reduce available balance the maximum * dollar risk allowed. StopLoss determines the maximum dollar risk possible * per lot. Lots=maxRisk/maxRiskPerLot **************************************************************************/ /*++++ Compute lot size based on account balance and MM mode*/{ double ab = AccountBalance() - at.risk.equity; switch(MM.F0M1G2){ case MMMODE_FIXED: double minRisk = MM.PerTrade, maxRisk = MM.MaxRisk; break; case MMMODE_MODERATE: // See https://www.mql5.com/en/articles/1526 Fallacies, Part 1: Money // Management is Secondary and Not Very Important. maxRisk = MathSqrt(MM.MaxRisk * ab); minRisk = MathSqrt(MM.PerTrade * ab); break; case MMMODE_GEOMETRICAL: minRisk = MM.PerTrade * ab; maxRisk = MM.MaxRisk * ab; break; } ComputeTEF(); double minLot = MarketInfo(Symbol(), MODE_MINLOT), lotStep = MarketInfo(Symbol(), MODE_LOTSTEP), perLotPerPoint = PointValuePerLot(), maxLossPerLot = (risk+Slippage.Pips*pips2dbl) * perLotPerPoint, size = minRisk / maxLossPerLot; // Must still round to lotStep. /*---- Compute lot size based on account balance and MM mode*/} /* The broker doesn't care about the at.risk/account balance. They care * about margin. Margin used=lots used*marginPerLot and that must be less * than free margin available. Using the lesser of size vs * AccountFreeMargin / MODE_MARGINREQUIRED should have been sufficient, but * the tester was generating error 134 even when marginFree should have been * OK. So I also use AccountFreeMarginCheck < 0 which agrees with the * tester. Reported at https://forum.mql4.com/35056 * * Second problem, after opening the new order, if free margin then drops to * zero we get a margin call. In the tester, the test stops with: "EA: * stopped because of Stop Out" So I make sure that the free margin * after is larger then the equity risk so I never get a margin call. */ string status = "SL>AE"; // Assume size < minLot while (true){ // Adjust for broker, test for margin, combine with TEF... size = MathFloor(MathMax(0.,size)/lotStep)*lotStep; at.risk.new = size * maxLossPerLot; // Export for Comment if (size < minLot){ at.risk.new = 0; EA.status = status; return(0); } if (at.risk.new+at.risk.chart > maxRisk){ size = (maxRisk-at.risk.chart)/maxLossPerLot; status = "MaxRisk"; continue; } // Multiple open trades double AFMC = AccountFreeMarginCheck(Symbol(), op.code, size), eRisk = at.risk.equity + risk*size*perLotPerPoint; /* at.risk.equity += Direction( OrderType() ) * * (OrderClosePrice()-OrderStopLoss())*perPoint; * Summed for all open orders. */ if (AFMC*0.99 <= eRisk){ size *= 0.95; status = "Free Margin"; continue; } // Prevent margin call if new trade goes against us. break; } return(size); // We're good to go. } // LotSize double PointValuePerLot() { // Value in account currency of a Point of Symbol. /* In tester I had a sale: open=1.35883 close=1.35736 (0.00147) * gain$=97.32/6.62 lots/147 points=$0.10/point or $1.00/pip. * IBFX demo/mini EURUSD TICKVALUE=0.1 MAXLOT=50 LOTSIZE=10,000 * IBFX demo/standard EURUSD TICKVALUE=1.0 MAXLOT=50 LOTSIZE=100,000 * $1.00/point or $10.00/pip. * * https://forum.mql4.com/33975 CB: MODE_TICKSIZE will usually return the * same value as MODE_POINT (or Point for the current symbol), however, an * example of where to use MODE_TICKSIZE would be as part of a ratio with * MODE_TICKVALUE when performing money management calculations which need * to take account of the pair and the account currency. The reason I use * this ratio is that although TV and TS may constantly be returned as * something like 7.00 and 0.00001 respectively, I've seen this * (intermittently) change to 14.00 and 0.00002 respectively (just example * tick values to illustrate). */ return( MarketInfo(Symbol(), MODE_TICKVALUE) / MarketInfo(Symbol(), MODE_TICKSIZE) ); // Not Point. }
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Hi, sorry to bother you all again, but I was wondering if anyone can point me in the right direction. The problem I am having is turning the formula on the attached file into code for my EA. I am trying to add code that will automatically change the lot size as my equity grows in increments of 500 pips, e.g. if I start with £1000 at 0.01 % risk (10p a pip) and when it reaches £1050, I automatically want the lot size to change to 0.019% risk (20p a pip), £1150 0.26% and so on. Please msg me if you do not understand the spreadsheet and I will endevour to explain it to you. I would like to keep all of the variables (in pink) if at all possible.
Thank You in advance for your time and help
MW