public void ExpTrend()
{
Trend.Exp(new List <double>()
{
1, 2, 5, 6
}, 0.5);
}
public Charts(SortedList <DateTime, double> list)
{
InitializeComponent();
List = list;
List <double> X = list.Keys.Select(p => (double)list.Keys.IndexOf(p) + 1).ToList();
List <double> Y = list.Values.ToList();
LineTrendValue = Trend.Line(Y, X);
ExpTrendValue = Trend.Exp(Y, X);
LogTrendValue = Trend.Log(Y, X);
PowTrendValue = Trend.Pow(Y, X);
foreach (var i in list)
{
chart1.Series[0].Points.AddXY(i.Key, i.Value);
chart1.Series[1].Points.AddXY(i.Key, LineTrendValue[list.Keys.IndexOf(i.Key)]);
chart1.Series[2].Points.AddXY(i.Key, ExpTrendValue[list.Keys.IndexOf(i.Key)]);
chart1.Series[3].Points.AddXY(i.Key, LogTrendValue[list.Keys.IndexOf(i.Key)]);
chart1.Series[4].Points.AddXY(i.Key, PowTrendValue[list.Keys.IndexOf(i.Key)]);
}
double Min = Math.Min(Math.Min(Math.Min(list.Values.Min(), LineTrendValue.Min()), Math.Min(ExpTrendValue.Min(), LogTrendValue.Min())), PowTrendValue.Min());
double Max = Math.Max(Math.Max(Math.Max(list.Values.Max(), LineTrendValue.Max()), Math.Max(ExpTrendValue.Max(), LogTrendValue.Max())), PowTrendValue.Max());
chart1.ChartAreas[0].AxisY.Minimum = Min - (Max - Min) / 10;
chart1.ChartAreas[0].AxisY.Maximum = Max + (Max - Min) / 5;
chart1.Legends[1].CustomItems[0].Cells[1].Text = Trend.R2(Y, LineTrendValue).ToString();
double b = Trend.B(Y, X);
double a = Trend.A(Y, X, b);
chart1.Legends[1].CustomItems[0].Cells[2].Text = "a+x*b=" + a + "+x*" + b;
chart1.Legends[1].CustomItems[1].Cells[1].Text = Trend.R2(Y, ExpTrendValue).ToString();
List <double> Y1 = Y.Select(y => Math.Log(y)).ToList();
b = Trend.B(Y1, X);
a = Trend.A(Y1, X, b);
chart1.Legends[1].CustomItems[1].Cells[2].Text = "a*e^(x*b)=" + a + "*e^(x*" + b + ")";
chart1.Legends[1].CustomItems[2].Cells[1].Text = Trend.R2(Y, LogTrendValue).ToString();
List <double> X1 = X.Select(x => Math.Log(x)).ToList();
b = Trend.B(Y, X1);
a = Trend.A(Y, X1, b);
chart1.Legends[1].CustomItems[2].Cells[2].Text = "a+ln(x*b)=" + a + "+ln(x*" + b + ")";
chart1.Legends[1].CustomItems[3].Cells[1].Text = Trend.R2(Y, PowTrendValue).ToString();
b = Trend.B(Y1, X1);
a = Trend.A(Y1, X1, b);
chart1.Legends[1].CustomItems[3].Cells[2].Text = "a*x^b=" + a + "*x^" + b;
}
