The following code displays both 6 & 10 HVR with 100 (all periods as params). Also for more periods on chart.
//+------------------------------------------------------------------+ //| HVR.mq4 | //| Copyright © 2005, Albert,(idea and code into MQL2 - podval) | //| Refactored © 2010, Brewmanz (add 2 HVR lines) | //| | //+------------------------------------------------------------------+ #property indicator_separate_window //---- //#property indicator_minimum 0 //#property indicator_maximum 3 #property indicator_buffers 3 //---- #property indicator_color1 Blue #property indicator_color2 Purple extern int PeriodLong=100; extern int PeriodShort=10; extern int PeriodVeryShort=6; double xVeryShort[], xShort[], xLong[]; #define kVolfactor 7.211102550927978586238442534941 //+------------------------------------------------------------------+ //| | //+------------------------------------------------------------------+ //---- buffers double HVRSBuffer[]; double HVRVSBuffer[]; //+------------------------------------------------------------------+ //| Custom indicator initialization function | //+------------------------------------------------------------------+ int init() { ArrayResize(xVeryShort, PeriodVeryShort); ArrayResize(xShort, PeriodShort); ArrayResize(xLong, PeriodLong); SetLevelValue(0, 0.0); SetLevelValue(1, 0.5); SetLevelValue(2, 1.0); SetLevelValue(3, 2.0); //---- 2 additional buffers are used for counting. IndicatorBuffers(2); SetIndexBuffer(0,HVRSBuffer); SetIndexBuffer(1,HVRVSBuffer); //---- indicator line SetIndexStyle(0,DRAW_LINE); SetIndexStyle(1,DRAW_LINE); //---- name for DataWindow and indicator subwindow label IndicatorShortName("HVR( " + PeriodVeryShort +" & " + PeriodShort + " /" + PeriodLong + ")"); SetIndexLabel(0,"HVR(" + PeriodShort + "/" + PeriodLong + ")"); SetIndexLabel(1,"HVR(" + PeriodVeryShort + "/" + PeriodLong + ")"); //---- //---- return(0); } //+------------------------------------------------------------------+ //| | //+------------------------------------------------------------------+ int start() { double hvVeryShort, hvShort, hvLong, meanVeryShort, meanShort, meanLong; int counted_bars=IndicatorCounted(); //---- last counted bar will be recounted if(counted_bars>0) counted_bars--; int ixLimit=Bars-counted_bars-1; for(int ix=ixLimit; ix>=0; ix--) { if(ix+PeriodLong >= Bars) continue; meanVeryShort=0; meanShort=0; meanLong=0; for(int i=0; i<PeriodLong; i++) { double myLog=MathLog(Close[ix+i]/Close[ix+i+1]); xLong[i]=myLog; meanLong+=myLog; if(i<PeriodShort) { xShort[i]=myLog; meanShort+=myLog; } if(i<PeriodVeryShort) { xVeryShort[i]=myLog; meanVeryShort+=myLog; } } meanVeryShort/=PeriodVeryShort; meanShort/=PeriodShort; meanLong/=PeriodLong; hvVeryShort=0; for(i=0; i<PeriodVeryShort; i++) hvVeryShort+=(xVeryShort[i] - meanVeryShort)*(xVeryShort[i] - meanVeryShort); hvVeryShort=MathSqrt(hvVeryShort/(PeriodVeryShort-1)) * kVolfactor; hvShort=0; for(i=0; i<PeriodShort; i++) hvShort+=(xShort[i] - meanShort)*(xShort[i] - meanShort); hvShort=MathSqrt(hvShort/(PeriodShort-1)) * kVolfactor; hvLong=0; for(i=0; i<PeriodLong; i++) hvLong+=(xLong[i] - meanLong)*(xLong[i] - meanLong); hvLong=MathSqrt(hvLong/(PeriodLong-1)) * kVolfactor; HVRVSBuffer[ix]= hvVeryShort/hvLong; HVRSBuffer[ix]= hvShort/hvLong; } } //+------------------------------------------------------------------+
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HVR:
Author: John Smith