Parabolic SAR

ICE Data Services -

sar() Built-in Study Functions

The Parabolic SAR study is a display of "Stop and Reverse" points for a particular market. When the market touches or crosses a point, this indicates that a positions should be reversed. If the current position is long, for example, go short. If the current position is short, go long. The Parabolic SAR assumes that you are always in the market.

Syntax
sar( nStart , nIncrement , nMax [, Series | sym() | inv() ][, nBarIndex ] )

Parameters
Parameter: Description: Default:
nStart Required. Number for starting SAR value.

 

n/a nIncrement Required. Number for the acceleration factor.

 

n/a nMax Required. Number for the maximum SAR value.

 

n/a Series or
sym() or
inv()
[Optional]  Series Object or function of sym() or inv() to determine symbol/interval source for the study.

 

Chart's sym/inv nBarIndex [Optional]  Bar index of series to retrieve.

 

n/a


Return Value(s)

Returns a Series Object when nBarIndex is not specified.

Returns a single value when nBarIndex is specified.


Notes
Only available in versions 7.9 or later.

The plot type for this study is typically set to PLOTTYPE_DOT in preMain() (see setPlotType()).


Code Examples
Single Line Indicator:
function main() {    return sar(0.02, 0.02, 2);}

Single Line Study-on-Study Indicator:
function main() {    return sar(0.02, 0.02, 2, hl2() );}

Retrieve single values:
function main() {    var nValue_0 = sar(0.02, 0.02, 2, 0);  // Current Bar Index    var nValue_1 = sar(0.02, 0.02, 2, -1); // Prior Bar Index             return new Array(nValue_0, nValue_1);}

Initialize a Series Object:
var xStudy = null;function main() {    if (xStudy == null) {        xStudy = sar(0.02, 0.02, 2);    }            // retrieve single values for conditional statements    var nValue_0 = xStudy.getValue(0);  // Current Bar Index value    var nValue_1 = xStudy.getValue(-1); // Prior Bar Index value            return nValue_0;  // Plot Current Bar Index Value}

Initialize a Series Object based on an external interval:
var xStudy = null;var bInit = false;  // Initialization flagfunction main() {    if (bInit == false) {        xStudy = sar(0.02, 0.02, 2, inv(20));  // 20-min interval        bInit = true;    }            // retrieve single values for conditional statements    var nValue_0 = xStudy.getValue(0);  // Current Bar Index value    var nValue_1 = xStudy.getValue(-1); // Prior Bar Index value            return getSeries(xStudy);  // Synchronized Series plot}


Initialize a Series Object based on an external symbol and interval:
var xStudy = null;var bInit = false;  // Initialization flagfunction main() {    if (bInit == false) {        xStudy = sar(0.02, 0.02, 2, sym("IBM,20"));  // IBM 20-min interval        bInit = true;    }         // retrieve single values for conditional statements    var nValue_0 = xStudy.getValue(0);  // Current Bar Index value    var nValue_1 = xStudy.getValue(-1); // Prior Bar Index value         return getSeries(xStudy);  // Synchronized Series plot}


See Also
Series Object
getSeries()
Built-in Study Functions
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