using System;
using MathNet.Numerics.LinearAlgebra;
public class Program
{
public static void Main()
int[,] mat = new int[3, 3] { { 2, 3, 1 }, { 2, 4, 6 }, { 7, 5, 2 } };
var matrix = Matrix<double>.Build.Dense(3, 3, (i, j) => mat[i, j]);
Console.WriteLine(matrix.Rank());
}