I do want to "100pip = loss 10% balance" scripts
The forumla depends on the specific currency pair and your specific account's denomination.
There are five currency pair "types"...for the purposes of computing the value at risk two of these "symbol types" (as I call them) are equivalent.
So there are four equations you need to have, as well as a firm understanding of why you need them and when to use them.
The script can be found in this post: https://www.mql5.com/en/forum/129553/page2#388122
Source code is there, meaning all four equations are there, that should get you off to a good start.
cjwhscjw:
to create the "100pip = loss 10% balance", What is the formula?
//+------------------------------------------------------------------+ //| Lot size computation. | //+------------------------------------------------------------------+ double oo.count; // Import from ModifyStops double LotSize(double risk){ /*double TEF.value, // Import from ComputeTEF //double at.risk; // Export to init/start //bool need2refresh; // Import from RelTradeContext //int op.code; // -1/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 **************************************************************************/ if (need2refresh) Refresh(); /*++++ Compute lot size based on account balance and MM mode*/{ double ab = AccountBalance(); switch(Money.Management.F0M1G2){ case MMMODE_FIXED: at.risk = Money.Management.Multiplier; break; case MMMODE_MODERATE: // See https://www.mql5.com/en/articles/1526 Fallacies, Part 1: Money // Management is Secondary and Not Very Important. // %used/trade= at.risk = MathSqrt(Money.Management.Multiplier * ab)/ab; // ~const rate. at.risk = MathSqrt(Money.Management.Multiplier * ab * MathPow( 1 - at.risk, OrdersTotal() )); break; case MMMODE_GEOMETRICAL: at.risk = Money.Management.Multiplier * ab * MathPow(1 - Money.Management.Multiplier, OrdersTotal()); break; } double maxLossPerLot = risk * PointValuePerLot(), /* Number of lots wanted = at.risk / maxLossPerLot rounded/truncated to * nearest lotStep size. * * However, 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. */ marginFree = AccountFreeMargin(), marginPerLot = MarketInfo( Symbol(), MODE_MARGINREQUIRED ), // So I use, the lesser of either. size = MathMin(marginFree / marginPerLot, at.risk / maxLossPerLot); /*---- Compute lot size based on account balance and MM mode*/} ComputeTEF(); double adjFact = IfD(MathMin(1, TEF.value), 1, TEF.Enable01), minLot = MarketInfo(Symbol(), MODE_MINLOT), LotStep = MarketInfo(Symbol(), MODE_LOTSTEP), perLotPerPoint = PointValuePerLot(); while (true){ // Adjust for broker, test for margin, combine with TEF size = MathFloor(size/LotStep)*LotStep; double eRisk = risk*(oo.lots+size)*perLotPerPoint; if (size < minLot){ // Insufficient margin. Print( "LotSize(SL=", DoubleToStr(risk/pips2dbl, Digits.pips), ")=", size, " [risk=", at.risk, AccountCurrency(), "/", maxLossPerLot, ", margin=", marginFree, "/", marginPerLot, ", MMM=", Money.Management.F0M1G2,"@",Money.Management.Multiplier, ", OO=", oo.count, ", Lots=", oo.lots, ", EquRisk=", eRisk, "]" ); size=0; break; } /* size<minLot should be 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 drops to * zero we get a margin call. In the tester, the test stops: "WHRea14: * 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. */ double AFMC = AccountFreeMarginCheck(Symbol(), op.code, size); /**/ if (AFMC <= eRisk) size *= 0.95; else if (adjFact < 1){ size = MathMax(minLot,size*adjFact);adjFact=1;} else break; // We're good to go. } at.risk = size * maxLossPerLot; // Export for Comment return(size); } // 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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i can not find scripts
I’m not about what to do.
to create the "100pip = loss 10% balance", What is the formula?