BBflat_sw.efs EFSLibrary - Discussion Board
File Name: BBflat_sw.efs
Description:
BBFlat SW
Formula Parameters:
Length : 9
Deviation : 1.5
Source of Price : Close
MA Type : SMA
Notes:
Download File:
BBflat_sw.efs
EFS Code:
/*********************************
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:
BBFlat SW
Version: 1.0 08/26/2009
Formula Parameters: Default:
Length 9
Deviation 1.5
Source of Price Close
MA Type SMA
Notes:
**********************************/
var fpArray = new Array();
var bInit = false;
function preMain(){
setPriceStudy(false);
setShowCursorLabel(true);
setShowTitleParameters(false);
setStudyTitle("BBFlat SW");
setCursorLabelName("BBFlatP", 0);
setDefaultBarFgColor(Color.red, 0);
setPlotType(PLOTTYPE_LINE, 0);
setCursorLabelName("BBFlatM", 1);
setDefaultBarFgColor(Color.red, 1);
setPlotType(PLOTTYPE_LINE, 1);
setCursorLabelName("BBFlat", 2);
setDefaultBarFgColor(Color.green, 2);
setPlotType(PLOTTYPE_LINE, 2);
var x = 0;
fpArray[x] = new FunctionParameter("Length", FunctionParameter.NUMBER);
with(fpArray[x++]) {
setName("Length");
setLowerLimit(1);
setDefault(9);
}
fpArray[x] = new FunctionParameter("Deviation", FunctionParameter.NUMBER);
with(fpArray[x++]) {
setName("Deviation");
setDefault(1.5);
}
fpArray[x] = new FunctionParameter("sPrice", FunctionParameter.STRING);
with(fpArray[x++]){
setName("Source of Price");
addOption("open");
addOption("high");
addOption("low");
addOption("close");
addOption("hl2");
addOption("hlc3");
addOption("ohlc4");
setDefault("close");
}
fpArray[x] = new FunctionParameter("sMAType", FunctionParameter.STRING);
with(fpArray[x++]) {
setName("MA Type");
addOption("sma");
addOption("ema");
addOption("wma");
addOption("vwma");
setDefault("sma");
}
}
var xBBFlatP = null;
var xBBFlatM = null;
var xBBFlat = null;
function main(Length, Deviation, sPrice, sMAType) {
var nBarState = getBarState();
var nBBFlatP = 0;
var nBBFlatM = 0;
var nBBFlat = 0;
if (nBarState == BARSTATE_ALLBARS) {
if(Length == null) Length = 9;
if(Deviation == null) Deviation = 1.5;
if(sPrice == null) sPrice = "close";
if(sMAType == null) sMAType = "sma";
}
if (bInit == false) {
addBand(0, PS_SOLID, 1, Color.black, "ZeroLine");
xBBFlatP = efsInternal("Calc_BBFlat", Length, Deviation, sPrice, sMAType)
xBBFlatM = getSeries(xBBFlatP, 1);
xBBFlat = getSeries(xBBFlatP, 2);
bInit = true;
}
nBBFlatP = xBBFlatP.getValue(0);
nBBFlatM = xBBFlatM.getValue(0);
nBBFlat = xBBFlat.getValue(0);
if (nBBFlatP == null || nBBFlat == null) return;
return new Array(nBBFlatP, nBBFlatM, nBBFlat);
}
var bSecondInit = false;
var xPrice = null;
var xMA = null;
var xStdDev = null;
function Calc_BBFlat(Length, Deviation, sPrice, sMAType) {
var nStdP = 0;
var nStdC = 0;
if (!bSecondInit) {
xPrice = eval(sPrice)();
xMA = eval(sMAType)(Length, xPrice);
xStdDev = efsInternal("Calc_StdDev", Length, xMA, xPrice);
bSecondInit = true;
}
nStdP = xStdDev.getValue(0);
if (nStdP == null) return;
nStdP = Deviation * nStdP;
nStdC = xPrice.getValue(0) - xMA.getValue(0);
return new Array(nStdP, -nStdP, nStdC);
}
function Calc_StdDev(LookBack, xPrice1Avg, xPrice1) {
var nRes = 0;
if (xPrice1Avg.getValue(0) == null) return;
for (var i = 0; i < LookBack; i++) {
nRes += Math.pow(xPrice1.getValue(-i) - xPrice1Avg.getValue(0),2);
}
nRes = Math.sqrt(nRes / LookBack);
if (nRes == null) nRes = 1;
return nRes;
}