using System;

using System.Linq;

using MathNet.Numerics.LinearAlgebra;

​

public class Program

{

    public static void Main(string[] args)

    {

        Matrix<double> x = Matrix<double>.Build.Dense(10, 3);

        for (int i = 0; i < 10; i++)

        {

            if (i > 4)

            {

                x[i, 0] = i;

            }

            else

            {

                x[i, 0] = 10 - i;

            }

        }

​

        Console.WriteLine("X:");

        for (int i = 0; i < x.RowCount; i++)

        {

            for (int j = 0; j < x.ColumnCount; j++)

            {

                Console.Write(x[i, j]);

                Console.Write("\t");

            }

​

            Console.Write("\n");

        }

​

        var y = Matrix<double>.Build.DenseOfRows(x.EnumerateRows().OrderBy(row => row[0]));

        Console.WriteLine("Y:");

        for (int i = 0; i < y.RowCount; i++)

        {

            for (int j = 0; j < y.ColumnCount; j++)

            {

                Console.Write(y[i, j]);

                Console.Write("\t");

            }

​

            Console.Write("\n");

        }

    }

}