using System;

using MathNet.Numerics;

using MathNet.Numerics.Interpolation;

​

class Program

{

    static void Main()

    {

        // Sample data points, as many as you want

        double[] x = { 0, 25, 50, 75, 100 };

        double[] y = { 100, 50, 40, 45, 50 };

​

        // X-Y value to check the interpolation against

        double[] checkValue = { 50, 40 };

​

        if (x.Length >= 5)

            PrintInterpolatedValues(CubicSpline.InterpolateAkimaSorted(x, y), "CubicSpline.InterpolateAkimaSorted");

        PrintInterpolatedValues(CubicSpline.InterpolateNaturalSorted(x, y), "CubicSpline.InterpolateNaturalSorted");

        PrintInterpolatedValues(CubicSpline.InterpolatePchipSorted(x, y), "CubicSpline.InterpolatePchipSorted");

​

        PrintInterpolatedValues(Interpolate.CubicSpline(x, y), "Interpolate.CubicSpline");

        if (x.Length >= 5)

            PrintInterpolatedValues(Interpolate.CubicSplineRobust(x, y), "Interpolate.CubicSplineRobust");

        PrintInterpolatedValues(Interpolate.CubicSplineMonotone(x, y), "Interpolate.CubicSplineMonotone");

        PrintInterpolatedValues(Interpolate.Linear(x, y), "Interpolate.Linear");

        PrintInterpolatedValues(Interpolate.LogLinear(x, y), "Interpolate.LogLinear");

        PrintInterpolatedValues(Interpolate.Polynomial(x, y), "Interpolate.Polynomial");

        PrintInterpolatedValues(Interpolate.PolynomialEquidistant(x, y), "Interpolate.PolynomialEquidistant");

​

        void PrintInterpolatedValues(IInterpolation interpolation, string name)

        {

            Console.WriteLine(name);

            for (int xValue = 0; xValue <= 100; xValue += 10)

            {

                double interpolatedValue = interpolation.Interpolate(xValue);

                Console.WriteLine($"{interpolatedValue:F3}");

            }

​

            if (interpolation.Interpolate(checkValue[0]) == checkValue[1])

            {

                Console.WriteLine("Interpolation hits the check value");

            }

            else

            {

                Console.WriteLine("Interpolation does not hit the check value");

            }

​

            Console.WriteLine();

        }

    }

}

​