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| Private Sub BtnCourbe_Click(sender As Object, e As EventArgs) Handles BtnCourbe.Click
'Effacer les courbes
ChartEta.Series.Clear()
ChartEta.Series.Add(New DataVisualization.Charting.Series())
ChartEta.Series.Item(0).ChartType = False
ChartEta.Series.Item(0).MarkerStyle = DataVisualization.Charting.MarkerStyle.Cross
'Afficher les points d'etalonnage
ChartEta.Visible = True
For Each Ligne As DataGridViewRow In DataGridView2.Rows
If Not IsNothing(Ligne.Cells.Item(1).Value) Then
ChartEta.Series.Item(0).Points.AddXY(Ligne.Cells.Item(0).Value, Ligne.Cells.Item(2).Value)
End If
Next
'Afficher la courbe
ChartEta.Series.Add("Trendline")
ChartEta.Series("Trendline").ChartType = SeriesChartType.Line
ChartEta.DataManipulator.FinancialFormula(FinancialFormula.Forecasting, "Power,1,false,false", ChartEta.Series.Item(0), ChartEta.Series("Trendline"))
'Afficher les valeurs a et b
Dim CoupleXY As DataPoint
Dim x1 As Double
Dim x2 As Double
Dim y1 As Double
Dim y2 As Double
Dim numerateur As Double
Dim denominateur As Double
Dim a As Double
Dim b As Double
For Each CoupleXY In ChartEta.Series("Trendline").Points
If CoupleXY.XValue = 1 Then
y2 = CoupleXY.YValues(0)
Else
x1 = CoupleXY.XValue
y1 = CoupleXY.YValues(0)
End If
If x1 <> 0 And y2 <> 0 Then Exit For
numerateur = (Math.Log(x2) * Math.Log(y1)) - (Math.Log(x1) * Math.Log(y2))
denominateur = Math.Log(x2) - Math.Log(x1)
a = 10 ^ (numerateur / denominateur)
b = (Math.Log(y1) - Math.Log(a)) / Math.Log(x1)
' a = y2
' b = Math.Log(y1 / y2) / Math.Log(x1)
Next
Lbla.Text = a
Lblb.Text = b
End Sub |
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