Two identical trading systems (for long and short deals) based on the ColorMaRsi-Trigger indicator signals that can be configured in different ways within a single EA with an ability to change the volume of a forthcoming trade depending on the results of the previous trades for this trading system. This EA was obtained by further complicating the Exp_ColorMaRsi-Trigger_Duplex trading system to change the volumes of the positions to be opened.
For this purpose, the blocks of the EA’s input parameters have been added:
input uint    L_TotalMMTriger=5;    //L number of the last Buy deals to calculate stop loss input uint    L_LossMMTriger=3;    //L number of losing Buy deals to reduce MM input double  L_SmallMM=0.01;      //L Share of a deposit in a deal in case of loss input double  L_MM=0.1;            //L Share of a deposit in a deal during normal trading input MarginMode L_MMMode=LOT;      //L lot setting mode
and
input uint    S_TotalMMTriger=5;    //S number of the last Sell deals to calculate stop loss input uint    S_LossMMTriger=3;    //S number of losing Sell deals to reduce MM input double  S_SmallMM=0.01;      //S Share of a deposit in a deal in case of loss input double  S_MM=0.1;            //S Share of a deposit in a deal during normal trading input MarginMode S_MMMode=LOT;      //S lot setting mode
In case of such inputs and when selecting from the last five trades, three of which are loss-making in a single direction, the EA opens the next trade in the same direction having the volume of 0.01 lot. If there are less than three loss-making trades out of the last five ones, the position volume is 0.1.
For the EA to operate, the compiled file of indicator ColorMaRsi-Trigger.ex5 should be in the <terminal_data_directory>MQL5Indicators.
Default Expert Advisor’s input parameters were used during the tests shown below. Stop Loss and Take Profit were not used during the tests.
Fig1. Sample deals on the chart with symmetrical settings.
Test results for AUDUSD H6 over the year 2016:
Fig. 2. Testing results chart.