^{ISubtractFunction
Hierarchy}

<sup>Type Library
TeeChartx

Description
SubtractFunction may be added to your project by Chart Editor at design time or at runtime using code. Default period for SubtractFunction is 1 (By default, subtract will show the subtraction of one series from another at each axis point). Period is applicable only to the number of axis points, Period 1 = 1 axis point; period 2 = 2 axis points, etc..</sup>

^{Subtract will only work with 2 input series. The first series in the Chart Editor list will subtract the 2nd series.}

^{Example [Visual Basic]:}

^{To set the period for SubtractFunction you should use the FunctionType property of Series}

^{To define a function series by code you should first create a new series for the function. The series may be of any type.}

^{{ Set the function using the SetFunction method}.}

^{TChart1.Series(1).SetFunction tfSubtract}

^{{You may then define the period for the function - here setting it to to 5}}

^{TChart1.Series(1).FunctionType.Period = 5}

^{To undefine (delete) a function defined for the series use you should either delete or inactivate the Series or redefine the Datasource to a different source.}