Channels are lines that surround a stock price movement, which help in projecting future price action. The Donchian Channel indicator uses the highest high and the lowest low of a period of time to plot the channel.
Syntax
upperDonchian( nLength [, Series | sym() | inv() ][, nBarIndex ] )
middleDonchian( nLength [, Series | sym() | inv() ][, nBarIndex ] )
lowerDonchian( nLength [, Series | sym() | inv() ][, nBarIndex ] )
Parameters
Parameter: Description: Default:
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.
Code Examples
Single Line Indicator:
function main() { return new Array(upperDonchian(20), middleDonchian(20), lowerDonchian(20) );}
Single Line Study-on-Study Indicator:
function main() { return new Array(upperDonchian(20, hl2()), middleDonchian(20, hl2()), lowerDonchian(20, hl2()) );}
Retrieve single values:
function main() { var nValue_0 = middleDonchian(20, 0); // Current Bar Index var nValue_1 = middleDonchian(20, -1); // Prior Bar Index return new Array(nValue_0, nValue_1);}
Initialize Series Objects:
//global Series Object variablesvar xStudy1 = null;var xStudy2 = null;var xStudy3 = null;function main() { if (xStudy1 == null) xStudy1 = upperDonchian(20); if (xStudy2 == null) xStudy2 = middleDonchian(20); if (xStudy3 == null) xStudy3 = lowerDonchian(20); // retrieve single values for conditional statements var nValue1_0 = xStudy1.getValue(0); // Current Bar Index value var nValue2_0 = xStudy2.getValue(0); // Current Bar Index value var nValue3_0 = xStudy3.getValue(0); // Current Bar Index value var nValue1_1 = xStudy1.getValue(-1); // Prior Bar Index value // Plot Current Bar Index Value return new Array(nValue1_0, nValue2_0, nValue3_0); }
Initialize a Series Object based on an external interval:
// global Series Object variablesvar xStudy1 = null;var xStudy2 = null;var xStudy3 = null;var bInit = false; // Initialization flagfunction main() { if (bInit == false) { xStudy1 = upperDonchian(20, inv(20)); // 20-min interval xStudy2 = middleDonchian(20, inv(20)); // 20-min interval xStudy3 = lowerDonchian(20, inv(20)); // 20-min interval bInit = true; } // retrieve single values for conditional statements var nValue1_0 = xStudy1.getValue(0); // Current Bar Index value var nValue1_1 = xStudy1.getValue(-1); // Prior Bar Index value // Synchronized Series plot return new Array(getSeries(xStudy1), getSeries(xStudy2), getSeries(xStudy3) ); }
Initialize a Series Object based on an external symbol and interval:
// global Series Object variablesvar xStudy1 = null;var xStudy2 = null;var xStudy3 = null;var bInit = false; // Initialization flagfunction main() { if (bInit == false) { xStudy1 = upperDonchian(20, sym("IBM,20")); // IBM 20-min interval xStudy2 = middleDonchian(20, sym("IBM,20")); //IBM20-min interval xStudy3 = lowerDonchian(20, sym("IBM,20")); //IBM20-min interval bInit = true; } // retrieve single values for conditional statements var nValue1_0 = xStudy1.getValue(0); // Current Bar Index value var nValue1_1 = xStudy1.getValue(-1); // Prior Bar Index value // Synchronized Series plot return new Array(getSeries(xStudy1), getSeries(xStudy2), getSeries(xStudy3) ); }
See Also
Series Object
getSeries()
Built-in Study Functions
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