public void FitsToExponentialSameAsExcelTrendLine()
{
// X Y
// 1 0.2
// 2 0.3
// 4 1.3
// 6 4.2
// -> y = 0.0981*exp(0.6284*x)
var x = new[] { 1.0, 2.0, 4.0, 6.0 };
var y = new[] { 0.2, 0.3, 1.3, 4.2 };
var resp = Fit.Exponential(x, y);
Assert.AreEqual(0.0981, resp.Item1, 1e-3);
Assert.AreEqual(0.6284, resp.Item2, 1e-3);
var resf = Fit.ExponentialFunc(x, y);
foreach (var z in Enumerable.Range(-3, 10))
{
Assert.AreEqual(0.0981 * Math.Exp(0.6284 * z), resf(z), 1e-2);
}
}
public virtual Func <double, double> ExponentialFittingFunc(double[] x, double[] y)
{
return(Fit.ExponentialFunc(x, y));
}
