using System;

using System.Linq;

using MathNet.Numerics.LinearAlgebra;

using System.Collections.Generic;

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().Distinct());

        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");

        }

  }}