public void TestInterpolationMethod_AkimaSpline()
{
double[] t = new double[] { -2.0, -1.0, 0.0, 1.0, 2.0 };
double[] x = new double[] { 1.0, 2.0, -1.0, 0.0, 1.0 };
IInterpolationMethod method = Interpolation.CreateAkimaCubicSpline(t, x);
Assert.IsInstanceOfType(typeof(AkimaSplineInterpolation), method, "Type");
for (int i = 0; i < t.Length; i++)
{
// verify the interpolated values exactly at the sample points.
Assert.AreEqual(x[i], method.Interpolate(t[i]), "A Exact Point " + i.ToString());
}
// TODO: Verify the expected values (that they are really the expected ones)
NumericAssert.AreAlmostEqual(-0.52, method.Interpolate(-2.4), 1e-15, "A -2.4");
NumericAssert.AreAlmostEqual(1.826, method.Interpolate(-0.9), 1e-15, "A -0.9");
NumericAssert.AreAlmostEqual(0.25, method.Interpolate(-0.5), 1e-15, "A -0.5");
NumericAssert.AreAlmostEqual(-1.006, method.Interpolate(-0.1), 1e-15, "A -0.1");
NumericAssert.AreAlmostEqual(-0.9, method.Interpolate(0.1), 1e-15, "A 0.1");
NumericAssert.AreAlmostEqual(-0.6, method.Interpolate(0.4), 1e-15, "A 0.4");
NumericAssert.AreAlmostEqual(0.2, method.Interpolate(1.2), 1e-15, "A 1.2");
NumericAssert.AreAlmostEqual(9, method.Interpolate(10.0), 1e-14, "A 10.0");
NumericAssert.AreAlmostEqual(-151, method.Interpolate(-10.0), 1e-14, "A -10.0");
}
private List <Position> GetPoints(List <Position> points, int type)
{
try
{
List <Position> result = new List <Position>();
IInterpolationMethod method = null;
List <double> xs = new List <double>();
List <double> ys = new List <double>();
if (type > 0)
{
for (int i = 0; i < points.Count; i++)
{
xs.Add(points[i].X);
ys.Add(points[i].Z);
}
}
if (type == 0)
{
result.AddRange(points);
}
else if (type == 1)
{
method = Interpolation.CreateNaturalCubicSpline(xs, ys);
}
else if (type == 2)
{
method = Interpolation.CreateAkimaCubicSpline(xs, ys);
}
if (method != null)
{
for (int i = 0; i < points.Count; i++)
{
Position p1 = points[i];
Position p2 = points[i + 1];
double x = (p1.X + p2.X) / 2;
}
}
return(result);
}
catch (System.Exception ex)
{
Log.Error(hisTag, "GetPoints", "Exception:" + ex);
return(null);
}
}
public void TestInterpolationMethod_AkimaSpline()
{
double[] t = new double[] { -2.0, -1.0, 0.0, 1.0, 2.0 };
double[] x = new double[] { 1.0, 2.0, -1.0, 0.0, 1.0 };
IInterpolationMethod method = Interpolation.CreateAkimaCubicSpline(t, x);
Assert.That(method, Is.TypeOf(typeof(AkimaSplineInterpolation)), "Type");
for (int i = 0; i < t.Length; i++)
{
// verify the interpolated values exactly at the sample points.
Assert.That(method.Interpolate(t[i]), Is.EqualTo(x[i]), "A Exact Point " + i.ToString());
}
// TODO: Verify the expected values (that they are really the expected ones)
Assert.That(method.Interpolate(-2.4), NumericIs.AlmostEqualTo(-0.52, 1e-15), "A -2.4");
Assert.That(method.Interpolate(-0.9), NumericIs.AlmostEqualTo(1.826, 1e-15), "A -0.9");
Assert.That(method.Interpolate(-0.5), NumericIs.AlmostEqualTo(0.25, 1e-15), "A -0.5");
Assert.That(method.Interpolate(-0.1), NumericIs.AlmostEqualTo(-1.006, 1e-15), "A -0.1");
Assert.That(method.Interpolate(0.1), NumericIs.AlmostEqualTo(-0.9, 1e-15), "A 0.1");
Assert.That(method.Interpolate(0.4), NumericIs.AlmostEqualTo(-0.6, 1e-15), "A 0.4");
Assert.That(method.Interpolate(1.2), NumericIs.AlmostEqualTo(0.2, 1e-15), "A 1.2");
Assert.That(method.Interpolate(10.0), NumericIs.AlmostEqualTo((double)9, 1e-14), "A 10.0");
Assert.That(method.Interpolate(-10.0), NumericIs.AlmostEqualTo((double)(-151), 1e-14), "A -10.0");
// Test Linear Case
for (int k = 2; k < 6; k++)
{
double[] linx, liny, linxtest, linytest;
BuildLinearCase(2, k + 4, out linx, out liny, out linxtest, out linytest);
IInterpolationMethod linearMethod = Interpolation.CreateAkimaCubicSpline(linx, liny);
for (int i = 0; i < linxtest.Length; i++)
{
Assert.That(linearMethod.Interpolate(linxtest[i]), NumericIs.AlmostEqualTo(linytest[i], 1e-12), String.Format("Linear k={0} i={1}", k, i));
}
}
}
