public static void WriteFile(double[,] matrix, int dimension, string filename)
        {
            StreamWriter file = new StreamWriter(filename);
            for (int l = 0; l < dimension; l++)
            {
                string line = "";
                for (int c = 0; c < dimension; c++)
                {
                    line += matrix[l,c];
                    if (c != dimension - 1)
                    {
                        line += " ";
                    }
                }
                file.WriteLine(line);
            }
            file.Close();
        }

        public static void WriteFile(double[] matrix, int dimension, string filename)
        {
            StreamWriter file = new StreamWriter(filename);
            for (int l = 0; l < dimension; l++)
            {
                string line = "";
                for (int c = 0; c < dimension; c++)
                {
                    line += matrix[l * dimension + c];
                    if (c != dimension - 1)
                    {
                        line += " ";
                    }
                }
                file.WriteLine(line);
            }
            file.Close();
        }