Double Exponential Moving Average : This function is contained within the Overlap Studies set of indicators.

Returns a 1-Column range.

outReal (Doubles).

(Reference - http://www.tadoc.org, http://www.ta-lib.org).

The Time_Period parameter determines the number of data points that the function will conduct it's analysis upon before moving on.

Thus if the value of the Time_Period parameter is 30, the first 30 points will be read, the analysis performed, then the 1st point is dropped and the 31st point added, analysis performed once again, then the 2nd point dropped and the 32nd point added, analysis performed etc... The Time_Period parameter almost acts as a sliding window, where the window size determines the amount of data that the analysis will be conducted upon.

The returned range will always be the size of the original range, minus the size of the Time_Period (the window).

This function requires the input of a Technical Analysis memory data table object key, which must have been produced via a call to MakeHistoricalDB(). This function would have returned a string 'KEY' which is to be passed to the 'Key' parameter of this function.

Variant CT_TA_Overlap.TA_DEMA( _
String Key, _
Boolean withHeaders, _
Boolean withDates, _
Boolean withData, _
String FieldName, _
Long Time_Period)

=CT.TA.DEMA(
Excel String Cell Key,
Excel Boolean Value Cell withHeaders,
Excel Boolean Value Cell withDates,
Excel Boolean Value Cell withData,
Excel String Cell FieldName,
Excel Numeric Cell Time_Period)

static CTRangeDataCPP TA_DEMA(
std::string Key,
bool withHeaders,
bool withDates,
bool withData,
std::string FieldName,
long Time_Period);

CTRangeData CT_TA_OverlapSA.TA_DEMA(
System.String Key,
System.Boolean withHeaders,
System.Boolean withDates,
System.Boolean withData,
System.String FieldName,
System.Int32 Time_Period);

The C# example below contains all the sub-function calls leading up to this function call. As a result, the example can contain a lot of code.

The VB.NET, J#, C++.NET, Java, Excel VBA, Visual Basic 6 (via COM) and C++ examples below contain function code stubs for the calls leading up to this function call. However, the function call for this function is displayed.
You can easily reproduce the stub functions code from the C# example.