/*********************************Provided By: eSignal (Copyright c eSignal), a division of Interactive Data Corporation. 2009. All rights reserved. This sample eSignal Formula Script (EFS) is for educational purposes only and may be modified and saved under a new file name. eSignal is not responsible for the functionality once modified. eSignal reserves the right to modify and overwrite this EFS file with each new release.Description: RAVI (Modification) Version: 1.0 06/10/2009 Formula Parameters: Default: SMA Length 1 7 SMA Length 2 65 Upper Level 0.3 Lower Level -0.3Notes: The indicator is alomost identical to the Price Oscillator and the MACD. Its uniqueness is in the usage of the exponent of the convergence-divergence of the rate as a trend indicator, which draws attention to the divergence and not to the intersection of the moving averages. T. Chande recommends the following levels for the indicator: plus/minus 0.3% or plus/minus 0.1% (depending on the market). When the indicator crosses above the upper level it is assumed that a rising trend has started. When the indicator crosses below the lower level it is assumed that a descending trend has started. The rising trend continues as the RAVI line continues to rise and conversely the descending trend continues as the RAVI continues to decrease. Once the indicator begins to turn back to the zero line it is assumed that the trend has ended and a channel has started. If however the indicator inverts again without passing through the range between the levels it is assumed that the trend has renewed. **********************************/var fpArray = new Array();var bInit = false;function preMain(){ setPriceStudy(false); setShowCursorLabel(true); setShowTitleParameters(false); setStudyTitle("RAVI"); setCursorLabelName("RAVI", 0); setPlotType(PLOTTYPE_HISTOGRAM, 0); setDefaultBarFgColor(Color.grey, 0); setDefaultBarThickness(2, 0); var x = 0; fpArray[x] = new FunctionParameter("SMA1_Len", FunctionParameter.NUMBER); with(fpArray[x++]) { setName("SMA Length 1"); setLowerLimit(1); setDefault(7); } fpArray[x] = new FunctionParameter("SMA2_Len", FunctionParameter.NUMBER); with(fpArray[x++]) { setName("SMA Length 2"); setLowerLimit(1); setDefault(65); } fpArray[x] = new FunctionParameter("LevelUp", FunctionParameter.NUMBER); with(fpArray[x++]) { setName("Upper Level"); setDefault(0.3); } fpArray[x] = new FunctionParameter("LevelDn", FunctionParameter.NUMBER); with(fpArray[x++]) { setName("Lower Level"); setDefault(-0.3); } }var xRAVI = null;function main(SMA1_Len, SMA2_Len, LevelUp, LevelDn) {var nBarState = getBarState();var nCurrent = 0;var nPrev = 0; if (nBarState == BARSTATE_ALLBARS) { if(SMA1_Len == null) SMA1_Len = 7; if(SMA2_Len == null) SMA2_Len = 65; if(LevelUp == null) LevelUp = 0.3; if(LevelDn == null) LevelDn = -0.3; } if (bInit == false) { xRAVI = efsInternal("Calc_RAVI", SMA1_Len, SMA2_Len); addBand(LevelUp, PS_SOLID, 1, Color.green, "Upper"); addBand(LevelDn, PS_SOLID, 1, Color.red, "Lower"); addBand(0, PS_SOLID, 1, Color.black, "Zero"); bInit = true; } nCurrent = xRAVI.getValue(0); nPrev = xRAVI.getValue(-1); if (nPrev == null) return; if ((nCurrent > nPrev) && (nCurrent > LevelUp)) { setBarFgColor(Color.green, 0); } if ((nCurrent < nPrev) && (nCurrent < LevelDn)) { setBarFgColor(Color.red, 0); } return nCurrent;}var bSecondInit = false;var xSMA1 = null;var xSMA2 = null;function Calc_RAVI(SMA1_Len, SMA2_Len) {var nRes = 0;var nSMA2 = 0;var nSMA1 = 0; if (bSecondInit == false) { xSMA1 = sma(SMA1_Len); xSMA2 = sma(SMA2_Len); bSecondInit = true; } nSMA2 = xSMA2.getValue(0); nSMA1 = xSMA1.getValue(0); if (nSMA2 == null || nSMA1 == null) return; nRes = ((nSMA1 - nSMA2) * 100) / nSMA2; return nRes;} |