private void CalculateEquation()
{
const int lines = 3;
const int columns = 4;
var matrix = new List <List <double> >();
for (var i = 0; i < lines; i++)
{
matrix.Add(new List <double>());
for (var n = 0; n < columns; n++)
{
matrix[i].Add(new double());
}
}
matrix[0][0] = double.Parse(textBox0_0.Text);
matrix[1][0] = double.Parse(textBox1_0.Text);
matrix[2][0] = double.Parse(textBox2_0.Text);
matrix[0][1] = double.Parse(textBox0_1.Text);
matrix[1][1] = double.Parse(textBox1_1.Text);
matrix[2][1] = double.Parse(textBox2_1.Text);
matrix[0][2] = double.Parse(textBox0_2.Text);
matrix[1][2] = double.Parse(textBox1_2.Text);
matrix[2][2] = double.Parse(textBox2_2.Text);
matrix[0][3] = double.Parse(textBox0_3.Text);
matrix[1][3] = double.Parse(textBox1_3.Text);
matrix[2][3] = double.Parse(textBox2_3.Text);
var equation = new EquationsSystem(matrix);
richTextBox1.Clear();
ShowSolutionStep(equation);
equation.FirstTransformation();
ShowSolutionStep(equation);
equation.StairsTransformation();
ShowSolutionStep(equation);
equation.InverseGauss();
double x = equation.Result.X;
double y = equation.Result.Y;
double z = equation.Result.Z;
richTextBox1.Text += $"x = {x}\n y = {y}\n z = {z}\n";
}
