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Toh4iem9
129 lines
4.8 KiB
Plaintext
129 lines
4.8 KiB
Plaintext
//+------------------------------------------------------------------+
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//| EfficiencyRatio_Calculator.mqh |
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//| Engine for Kaufman's Efficiency Ratio (ER). |
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//| Formula: Net Change / Sum of Changes. |
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//| Copyright 2026, xxxxxxxx |
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//+------------------------------------------------------------------+
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#property copyright "Copyright 2026, xxxxxxxx"
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#include <MyIncludes\HeikinAshi_Tools.mqh>
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//+==================================================================+
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//| CLASS: CEfficiencyRatioCalculator |
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//+==================================================================+
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class CEfficiencyRatioCalculator
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{
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protected:
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int m_period;
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double m_price[]; // Persistent price buffer
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virtual bool PreparePrice(int rates_total, int start_index, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[]);
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public:
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CEfficiencyRatioCalculator() {};
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virtual ~CEfficiencyRatioCalculator() {};
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bool Init(int period);
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void Calculate(int rates_total, int prev_calculated, ENUM_APPLIED_PRICE price_type,
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const double &open[], const double &high[],
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const double &low[], const double &close[],
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double &out_er[]);
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};
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//+------------------------------------------------------------------+
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//| Init |
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//+------------------------------------------------------------------+
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bool CEfficiencyRatioCalculator::Init(int period)
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{
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m_period = (period < 1) ? 1 : period;
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return true;
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}
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//+------------------------------------------------------------------+
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//| Main Calculation |
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//+------------------------------------------------------------------+
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void CEfficiencyRatioCalculator::Calculate(int rates_total, int prev_calculated, ENUM_APPLIED_PRICE price_type,
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const double &open[], const double &high[],
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const double &low[], const double &close[],
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double &out_er[])
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{
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if(rates_total <= m_period)
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return;
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// 1. Resize Internal
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if(ArraySize(m_price) != rates_total)
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ArrayResize(m_price, rates_total);
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// 2. Prepare Data
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int prepare_start = (prev_calculated > 0) ? prev_calculated - 1 : 0;
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if(!PreparePrice(rates_total, prepare_start, price_type, open, high, low, close))
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return;
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// 3. Calculate ER
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int start_index = (prev_calculated > 0) ? prev_calculated - 1 : m_period;
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if(start_index < m_period)
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start_index = m_period;
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for(int i = start_index; i < rates_total; i++)
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{
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double net_change = MathAbs(m_price[i] - m_price[i - m_period]);
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double sum_change = 0.0;
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// Sum absolute bar-to-bar changes over period
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for(int k = 0; k < m_period; k++)
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{
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sum_change += MathAbs(m_price[i - k] - m_price[i - k - 1]);
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}
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if(sum_change > 1.0e-9) // Determine efficiency
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out_er[i] = net_change / sum_change;
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else
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out_er[i] = 1.0; // If no volatility, mathematically efficient (flat line) but usually handled as 0 or previous.
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// 1.0 is technically correct for straight line, but in trading sum_change=0 usually happens with gaps or bad data.
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// Let's default to 0.0 for safety in trading context if flat.
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if(sum_change == 0.0)
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out_er[i] = 0.0;
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}
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}
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//+------------------------------------------------------------------+
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//| Prepare Price |
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//+------------------------------------------------------------------+
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bool CEfficiencyRatioCalculator::PreparePrice(int rates_total, int start_index, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[])
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{
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for(int i = start_index; i < rates_total; i++)
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{
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switch(price_type)
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{
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case PRICE_CLOSE:
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m_price[i] = close[i];
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break;
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case PRICE_OPEN:
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m_price[i] = open[i];
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break;
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case PRICE_HIGH:
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m_price[i] = high[i];
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break;
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case PRICE_LOW:
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m_price[i] = low[i];
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break;
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case PRICE_MEDIAN:
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m_price[i] = (high[i]+low[i])*0.5;
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break;
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case PRICE_TYPICAL:
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m_price[i] = (high[i]+low[i]+close[i])/3.0;
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break;
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case PRICE_WEIGHTED:
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m_price[i] = (high[i]+low[i]+close[i]*2.0)*0.25;
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break;
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default:
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m_price[i] = close[i];
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break;
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}
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}
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return true;
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}
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//+------------------------------------------------------------------+
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