.netCHARTING v10.5 Documentation


dotnetCHARTING Namespace > ForecastEngine Class > TrendLineLogarithmic Method : TrendLineLogarithmic(SeriesCollection,Double,Int32,Int32) Method
A collection of series objects. For example, to evaluate this indicator for two series you will need to pass a series collection containing this two series.
The distance in the x-coordinate between two adjacent extended points. Please note that this also corresponds to the distance in the x-coordinate between the highest and lowest original data point and the first (above or below) additional evaluation point.
The number of additional evaluation points which are evaluated above the x-coordinates of the original given data set.
The number of additional evaluation points which are evaluated below the x-coordinates of the original given data set.
TrendLineLogarithmic(SeriesCollection,Double,Int32,Int32) Method
Find the best fit for the function f(x) = a + b * ln(x).
Syntax
'Declaration
 
Public Overloads Shared Function TrendLineLogarithmic( _
   ByVal sc As SeriesCollection, _
   ByVal step As Double, _
   ByVal forward As Integer, _
   ByVal backward As Integer _
) As SeriesCollection
'Usage
 
Dim sc As SeriesCollection
Dim step As Double
Dim forward As Integer
Dim backward As Integer
Dim value As SeriesCollection
 
value = ForecastEngine.TrendLineLogarithmic(sc, step, forward, backward)
public static SeriesCollection TrendLineLogarithmic( 
   SeriesCollection sc,
   double step,
   int forward,
   int backward
)

Parameters

sc
A collection of series objects. For example, to evaluate this indicator for two series you will need to pass a series collection containing this two series.
step
The distance in the x-coordinate between two adjacent extended points. Please note that this also corresponds to the distance in the x-coordinate between the highest and lowest original data point and the first (above or below) additional evaluation point.
forward
The number of additional evaluation points which are evaluated above the x-coordinates of the original given data set.
backward
The number of additional evaluation points which are evaluated below the x-coordinates of the original given data set.

Return Value

A series where the k-th element of the array represents of k-th point (i.e. { x_k, y_k }) of the total set over which the fitted function is evaluated. The total set over which the fitted function is evaluated consists of the `backward' points, original data set points and the `forward' points.

Remark: This methods corresponds in functionality to the method of the same name within Microsoft Excel.

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also