private void button3_Click(object sender, EventArgs e)
{
kalimat = textBox6.Text;
bool input_sah = true;
try
{
manipulasi_turunan();
}
catch { input_sah = false; }
label9.Visible = false;
board2.Rows.Clear();
label7.Visible = true;
label7.Text = "f'(x) = " + turunan;
if (!validasi_x(textBox5.Text))
{
label9.Visible = true;
}
if (validasi_x(textBox5.Text) && input_sah)
{
fungsi f = new fungsi();
f.kalimat = kalimat;
f.manipulasi();
fungsi t = new fungsi();
t.kalimat = turunan;
t.manipulasi();
decimal x0 = Convert.ToDecimal(textBox5.Text), xi;
board2.Rows.Add();
board2[0, 0].Value = 0;
board2[1, 0].Value = x0;
int i = 1;
while (i < 200)
{
xi = x0 - (decimal)(f.fx((double)x0) / t.fx((double)x0));
decimal selisih = Math.Abs(xi - x0);
x0 = xi;
board2.Rows.Add();
board2[0, i].Value = i.ToString();
board2[1, i].Value = xi.ToString();
board2[2, i].Value = selisih.ToString();
if (selisih == 0.0m)
{
board2[1, i - 1].Style.BackColor = Color.Yellow;
board2[1, i].Style.BackColor = Color.Yellow;
board2[2, i].Style.ForeColor = Color.Red;
break;
}
i++;
}
textBox4.Text = Math.Round(Convert.ToDecimal(board2[1, i - 1].Value), 15).ToString();
}
}
private void button4_Click(object sender, EventArgs e)
{
kalimat = textBox7.Text;
label14.Visible = false; label16.Visible = false;
dataGridView1.Rows.Clear();
if (!validasi_x(textBox8.Text))
{
label14.Visible = true;
}
if (!validasi_x(textBox9.Text))
{
label16.Visible = true;
}
bool input_sah = true;
fungsi f = new fungsi();
try
{
f.kalimat = kalimat;
f.manipulasi();
}
catch { input_sah = false; }
if (input_sah && validasi_x(textBox8.Text) && validasi_x(textBox9.Text))
{
decimal x0 = Convert.ToDecimal(textBox8.Text);
decimal x1 = Convert.ToDecimal(textBox9.Text);
decimal xi = 0;
dataGridView1.Rows.Add();
dataGridView1[0, 0].Value = 0;
dataGridView1[1, 0].Value = x0;
dataGridView1.Rows.Add();
dataGridView1[0, 1].Value = 1;
dataGridView1[1, 1].Value = x1;
dataGridView1[2, 1].Value = (x1 - x0).ToString();
bool berhenti = false;
int i = 2;
while (i <= 200)
{
if (Math.Abs((f.fx((double)x1) - f.fx((double)x0))) == 0.000000000000)
{
berhenti = true; break;
}
try
{
xi = x1 - (((decimal)f.fx((double)x1) * (x1 - x0)) / (decimal)(f.fx((double)x1) - f.fx((double)x0)));
}
catch { berhenti = true; break; }
decimal selisih = Math.Abs(xi - x1);
x0 = x1;
x1 = xi;
dataGridView1.Rows.Add();
dataGridView1[0, i].Value = i.ToString();
dataGridView1[1, i].Value = xi.ToString();
dataGridView1[2, i].Value = selisih.ToString();
if (selisih == 0.0m)
{
dataGridView1[1, i - 1].Style.BackColor = Color.Yellow;
dataGridView1[1, i].Style.BackColor = Color.Yellow;
dataGridView1[2, i].Style.ForeColor = Color.Red;
break;
}
i++;
}
string s;
if (berhenti)
{
s = "Divided by Zero";
}
else if (i > 200)
{
s = "Divergen";
}
else
{
s = Math.Round(xi, 10).ToString();
}
textBox10.Text = s;
}
}