/// <summary>
/// The read file.
/// </summary>
/// <param name="fileLocation">
/// The file location.
/// </param>
/// <returns>
/// The <see cref="IInterpolation"/>.
/// </returns>
public static IInterpolation ReadFile(string fileLocation)
{
FileInfo fileInfo = new FileInfo(fileLocation);
List<double> xValues = new List<double>();
List<double> yValues = new List<double>();
using (TextReader reader = new StreamReader(fileInfo.FullName))
{
string line;
while((line = reader.ReadLine()) != null)
{
string[] splitLine = line.Split(',');
double xValue = double.Parse(splitLine[0]);
double yValue = double.Parse(splitLine[1]);
xValues.Add(xValue);
yValues.Add(yValue);
}
}
IInterpolation interpolation = new StepInterpolation(xValues.ToArray(), yValues.ToArray());
return interpolation;
}
public void FitsAtSamplePoints()
{
IInterpolation ip = new StepInterpolation(_t, _y);
for (int i = 0; i < _y.Length; i++)
{
Assert.AreEqual(_y[i], ip.Interpolate(_t[i]), "A Exact Point " + i);
}
}
public void FirstDerivative()
{
IInterpolation ip = new StepInterpolation(_t, _y);
Assert.That(ip.Differentiate(-3.0), Is.EqualTo(0.0));
Assert.That(ip.Differentiate(-2.0), Is.EqualTo(double.NaN));
Assert.That(ip.Differentiate(-1.5), Is.EqualTo(0.0));
Assert.That(ip.Differentiate(-1.0), Is.EqualTo(double.NaN));
Assert.That(ip.Differentiate(-0.5), Is.EqualTo(0.0));
Assert.That(ip.Differentiate(0.0), Is.EqualTo(double.NaN));
Assert.That(ip.Differentiate(0.5), Is.EqualTo(0.0));
Assert.That(ip.Differentiate(1.0), Is.EqualTo(double.NaN));
Assert.That(ip.Differentiate(2.0), Is.EqualTo(double.NaN));
Assert.That(ip.Differentiate(3.0), Is.EqualTo(double.NaN));
Assert.That(ip.Differentiate(4.0), Is.EqualTo(0.0));
}
public void DefiniteIntegral()
{
IInterpolation ip = new StepInterpolation(_t, _y);
Assert.That(ip.Integrate(-3.0, -2.0), Is.EqualTo(0.0));
Assert.That(ip.Integrate(-2.0, -1.0), Is.EqualTo(1.0));
Assert.That(ip.Integrate(-1.0, 0.0), Is.EqualTo(2.0));
Assert.That(ip.Integrate(0.0, 1.0), Is.EqualTo(-1.0));
Assert.That(ip.Integrate(1.0, 2.0), Is.EqualTo(0.0));
Assert.That(ip.Integrate(2.0, 3.0), Is.EqualTo(1.0));
Assert.That(ip.Integrate(3.0, 4.0), Is.EqualTo(0.0));
Assert.That(ip.Integrate(0.0, 4.0), Is.EqualTo(0.0));
Assert.That(ip.Integrate(-3.0, -1.0), Is.EqualTo(1.0));
Assert.That(ip.Integrate(-3.0, 4.0), Is.EqualTo(3.0));
Assert.That(ip.Integrate(0.5, 1.5), Is.EqualTo(-0.5));
Assert.That(ip.Integrate(-1.5, -0.5), Is.EqualTo(1.5));
Assert.That(ip.Integrate(3.0, 4.0), Is.EqualTo(0.0));
}
