public static string Fit(Altaxo.Graph.GUI.GraphController ctrl)
{
if (ctrl.CurrentPlotNumber < 0)
{
return("No active plot!");
}
IGPlotItem plotItem = ctrl.ActiveLayer.PlotItems.Flattened[ctrl.CurrentPlotNumber];
XYColumnPlotItem xyPlotItem = plotItem as XYColumnPlotItem;
if (xyPlotItem == null)
{
return("Active plot is not a X-Y Plot!");
}
INumericColumn xColumn = xyPlotItem.XYColumnPlotData.XColumn as INumericColumn;
INumericColumn yColumn = xyPlotItem.XYColumnPlotData.YColumn as INumericColumn;
if (xColumn == null)
{
return("The x-column is not numeric");
}
if (yColumn == null)
{
return("The y-column is not numeric");
}
Calc.Regression.Nonlinear.NonlinearFitDocument localdoc = ctrl.Doc.GetGraphProperty(FitDocumentPropertyName) as Calc.Regression.Nonlinear.NonlinearFitDocument;
if (localdoc == null)
{
if (_lastFitDocument == null)
{
localdoc = new Altaxo.Calc.Regression.Nonlinear.NonlinearFitDocument();
}
else
{
localdoc = (Altaxo.Calc.Regression.Nonlinear.NonlinearFitDocument)_lastFitDocument.Clone();
}
}
if (localdoc.FitEnsemble.Count == 0)
{
Calc.Regression.Nonlinear.FitElement fitele = new Altaxo.Calc.Regression.Nonlinear.FitElement(
xColumn,
yColumn,
xyPlotItem.XYColumnPlotData.PlotRangeStart,
xyPlotItem.XYColumnPlotData.PlotRangeLength);
localdoc.FitEnsemble.Add(fitele);
}
else // localdoc.FitEnsemble.Count>0
{
localdoc.FitEnsemble[0].SetIndependentVariable(0, xColumn);
localdoc.FitEnsemble[0].SetDependentVariable(0, yColumn);
localdoc.FitEnsemble[0].SetRowRange(xyPlotItem.XYColumnPlotData.PlotRangeStart, xyPlotItem.XYColumnPlotData.PlotRangeLength);
}
localdoc.FitContext = ctrl;
object fitdocasobject = localdoc;
if (true == Current.Gui.ShowDialog(ref fitdocasobject, "Non-linear fitting"))
{
// store the fit document in the graphs property
ctrl.Doc.SetGraphProperty(FitDocumentPropertyName, localdoc);
_lastFitDocument = (Altaxo.Calc.Regression.Nonlinear.NonlinearFitDocument)localdoc.Clone();
}
return(null);
}
