private void buttonMainSolve_Click(object sender, EventArgs e)
{
n = int.Parse(textBoxDiv.Text);
Column3.HeaderText = "v(xi)";
Column4.HeaderText = "v2(x2i)";
Column5.HeaderText = "|v(xi) - v2(x2i)|";
dataGridView1.Rows.Clear();
dataGridView1.Visible = false;
task = new MainTask();
List <double> ai;
List <double> di;
List <double> phi;
List <double> vi;
List <double> ai2;
List <double> di2;
List <double> phi2;
List <double> vi2;
List <double> dif;
List <double> xi = new List <double>();
List <double> xi2 = new List <double>();
List <double> x2i = new List <double>();
List <double> x2i2 = new List <double>();
List <List <double> > matrix;
List <List <double> > matrix2;
double h = 1.0 / n;
task.GetGrids(ref xi, ref xi2, h);
ai = task.GetAi(h, n, xi);
di = task.GetDi(h, xi2);
phi = task.GetPhi(h, xi2);
matrix = task.GetMatrix(n, h, ai, di, phi);
vi = task.GetDifSceme(n, matrix);
int n2 = n * 2;
double h2 = 1.0 / n2;
task.GetGrids(ref x2i, ref x2i2, h2);
ai2 = task.GetAi(h2, n2, x2i);
di2 = task.GetDi(h2, x2i2);
phi2 = task.GetPhi(h2, x2i2);
matrix2 = task.GetMatrix(n2, h2, ai2, di2, phi2);
vi2 = task.GetDifSceme(n2, matrix2);
dif = task.GetAbsDif(vi, vi2);
DrawSolve(xi, vi2, vi);
DrawError(xi, dif);
zedGraphControl2.GraphPane.XAxis.Title = "X";
zedGraphControl2.GraphPane.YAxis.Title = "U(xi)";
zedGraphControl1.GraphPane.XAxis.Title = "X";
zedGraphControl1.GraphPane.YAxis.Title = "|v(xi) - v2(x2i)|";
dataGridView1.Visible = true;
labelInfo.Text = "Для решения задачи использована равномерная сетка с числом разбиений n = " +
n.ToString() + "\n \n" + "Задача решена с погрешностью max(|v(xi) - v2(x2i)|) = " +
dif.Max().ToString() +
"\n \n" + "Mаксимальная разность численных решений в общих узлах сетки наблюдается в точке x = " +
xPoint.ToString();
}