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Trend Line Exponential Ext

Demonstrates the use of TrendLineExponential from within ForecatEngine which find the best fitting exponential curve to sets of data.

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<%@ Page Language="C#" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="dotnetCHARTING"%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>.netCHARTING Forecasting Sample - ExponentialFit</title>
<script runat="server">

void Page_Load(Object sender,EventArgs e)
{

// Demonstrates the use of TrendLineExponential from within ForecatEngine
// which find the best fitting exponential curve to sets of data

// The Forecast Chart
ForecastChart.Title="Forecast Exponential";
ForecastChart.TempDirectory="temp";
ForecastChart.Debug=true;
ForecastChart.Size = "1000x400";
ForecastChart.LegendBox.Template ="%icon %name";
ForecastChart.XAxis.Scale = Scale.Normal;

SeriesCollection exponential = new SeriesCollection();
// Generate a exponential data sample
Series sampledata1 = new Series ("Sample 1");
for ( int i = 1; i < 12; i++) {
Element el = new Element();
el.YValue = Math.Exp(i)+ 5;
el.XValue = i ;
sampledata1.Elements.Add (el);
}

exponential.Add (sampledata1);
exponential[0].Type = SeriesType.Marker;

// Add the exponetial SeriesCollection to the chart
ForecastChart.SeriesCollection.Add (exponential);

// Here we create a series which will hold the Y values calculated with the ExponentialFit
// considering three additional evaluation points which above the x-coordinates of the
// original given data set.
Series expFit = new Series();
expFit = ForecastEngine.TrendLineExponential(sampledata1,1,3,0);

//The next two lines display on to the chart the exponential function used
// to fit the curve
expFit.Elements[0].SmartLabel.Text = "Function: %Function";
expFit.Elements[0].ShowValue = true;

expFit.DefaultElement.Color = Color.FromArgb(255,99,49);
expFit.Type = SeriesType.Spline;
ForecastChart.SeriesCollection.Add(expFit);

}

</script>
</head>
<body>
<div style="text-align:center">

<dotnet:Chart id="ForecastChart" runat="server"/>

</div>
</body>
</html>

<%@ Page Language="vb" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="dotnetCHARTING"%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>.netCHARTING Forecasting Sample - ExponentialFit</title>
<script runat="server">

Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

' Demonstrates the use of TrendLineExponential from within ForecatEngine
' which find the best fitting exponential curve to sets of data

' The Forecast Chart
ForecastChart.Title="Forecast Exponential"
ForecastChart.TempDirectory="temp"
ForecastChart.Debug=True
ForecastChart.Size = "1000x400"
ForecastChart.LegendBox.Template ="%icon %name"
ForecastChart.XAxis.Scale = Scale.Normal

Dim exponential As SeriesCollection = New SeriesCollection()
' Generate a exponential data sample
Dim sampledata1 As Series = New Series ("Sample 1")
For i As Integer = 1 To 11
Dim el As Element = New Element()
el.YValue = Math.Exp(i)+ 5
el.XValue = i
sampledata1.Elements.Add (el)
Next i

exponential.Add (sampledata1)
exponential(0).Type = SeriesType.Marker

' Add the exponetial SeriesCollection to the chart
ForecastChart.SeriesCollection.Add (exponential)

' Here we create a series which will hold the Y values calculated with the ExponentialFit
' considering three additional evaluation points which above the x-coordinates of the
' original given data set.
Dim expFit As Series = New Series()
expFit = ForecastEngine.TrendLineExponential(sampledata1,1,3,0)

'The next two lines display on to the chart the exponential function used
' to fit the curve
expFit.Elements(0).SmartLabel.Text = "Function: %Function"
expFit.Elements(0).ShowValue = True

expFit.DefaultElement.Color = Color.FromArgb(255,99,49)
expFit.Type = SeriesType.Spline
ForecastChart.SeriesCollection.Add(expFit)

End Sub

</script>
</head>
<body>
<div style="text-align:center">

<dotnet:Chart id="ForecastChart" runat="server"/>

</div>
</body>
</html>

Sample FilenameTrendLineExponentialExt.aspx
VersionLegacy (Pre 3.0)
Uses DatabaseNo

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Trend Line Exponential Ext