public List<double[]> GautiMazgus(int mazgu_kiekis, double start, double end)
        {
            var rand = new Random();
            var len = Math.Abs(start - end);
            var separation = (double)len / 12;

            List<double[]> mazgai = new List<double[]>();

            for (int x = 0; x < mazgu_kiekis; x += 1)
            {
                mazgai.Add(new double[] { x, rand.NextDouble() * 4 }); // x ir y reiksmes sudedu tuo paciu
            }
            return mazgai;
        }

        public double[] gautiKoef(List<double[]> mazgai)
        {
            double[] y = new double[mazgai.Count];

            for (int i = 0; i < mazgai.Count; i++)
            {
                y[i] = mazgai[i][1]; // priskiriami y
            }

            var T = new double[mazgai.Count, mazgai.Count];

            for (int i = 0; i < mazgai.Count; i++)
            {
                for(int j = 0; j < mazgai.Count; j++)
                {
                    T[i,j] = Math.Pow(mazgai[i][0], j); // Uzpildom matrica pagal bazines funkcijas
                    richTextBox1.AppendText(T[i, j] + " ");
                }
                richTextBox1.AppendText("\n");
            }

            var A = Matrix<double>.Build.DenseOfArray(T); // Spredziame tiesiniu lygciu sistema A*X = B
            var B = Vector<double>.Build.Dense(y);
            var x = A.Solve(B);

            return x.ToArray();
        }

        private double VienanariuInterpoliuota(int taskuSkaicius, double[] a, double x)
        {
            double result = a[0];
            for (int i = 1; i < taskuSkaicius; i++)
            {
                result += a[i] * Math.Pow(x, i);
            }
            return result;
        }

        private void button6_Click_1(object sender, EventArgs e)
        {
            data1.Clear();
            data2.Clear();
            ClearForm();
            int mazguSk = 4;
            var mazgai = GautiMazgus(mazguSk, -2, 2);
            var koeficientai = gautiKoef(mazgai);

            foreach(var i in koeficientai)
                richTextBox1.AppendText(i + "\n");
            richTextBox1.AppendText("\n");

            for (int i = 0; i < mazguSk; i++)
            {
                richTextBox1.AppendText(mazgai[i][0] + " " + mazgai[i][1] + "\n");
            }
            PreparareForm(-4, 4, -7, 5);

            Series XMid = chart1.Series.Add("Mazgai");
            XMid.ChartType = SeriesChartType.Point;
            XMid.MarkerStyle = MarkerStyle.Circle;
            XMid.MarkerSize = 8;

            for (int i = 0; i < mazguSk; i++)
            {
                XMid.Points.AddXY(mazgai[i][0], mazgai[i][1]);
            }

            var series = chart1.Series.Add("Laisvai pasirinkus taskus");
            series.ChartType = SeriesChartType.Line;
            series.BorderWidth = 3;

            double x = 0;
            while (x <= mazguSk-1)
            {
                series.Points.AddXY(x, VienanariuInterpoliuota(mazguSk, koeficientai, x));
                x = x + 0.01;
            }
        }