private void LoadTableFromXML()
{
OpenFileDialog openDlg = new OpenFileDialog();
openDlg.Filter = "XML | *.xml";
if (openDlg.ShowDialog() == true)
{
try
{
Lp = LagrangePolynom.ReadFromXML(openDlg.FileName);
}
catch (InvalidOperationException)
{
MessageBox.Show("Invalid XML file!", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
return;
}
Gx = new ExprTree.Expression(Lp.ToString(), "x");
this.FileName = openDlg.FileName;
//show the values in the point grid
pointsDt.Clear();
foreach (Point p in Lp.GetPointCollection())
{
DataRow newRow = pointsDt.NewRow();
newRow["X"] = p.X;
newRow["Y"] = p.Y;
pointsDt.Rows.Add(newRow);
}
pointGrid.DataContext = pointsDt;
pointGrid.UpdateLayout();
}
}
private double CalcInterpolationError() //Maximum interp error among interpolation points
{
double error = 0;
Point[] interpolationPoints = Lp.GetPointCollection();
Func <double, double> gx = Gx.CompileDynamicMethod();
for (int i = 0; i < interpolationPoints.Length; i++)
{
double gxValue = gx(interpolationPoints[i].X);
if (gxValue != interpolationPoints[i].Y)
{
error = Math.Max(gxValue, error);
}
}
return(error);
}
