Hi,

I written this code to calculate the clusters with the points taken from a datagridview.

It works fine for small number of data points. But taking lot of time(nearly 15 mins) to run for 1000 rows and 5 columns in a datagridview.

Is there a way to make it faster?

```
private void button2_Click(object sender, EventArgs e)
{
int[] s = new int[10000];
double[] k1 = new double[100];
double h = 0;
Dictionary<double, List<double>> d1 = new Dictionary<double, List<double>>();
List<double> l = new List<double>();
string d = "";
int ch;
double f = 0.0001;
Random Rnd = new Random();
int k = int.Parse(textBox4.Text);
double old_error, error = double.MaxValue;
double q = 0, v = 0, o = 0;
double[,] m1 = new double[dataGridView1.RowCount, 8];
double[,] c1 = new double[dataGridView1.RowCount, 8];
int u = int.MaxValue;
int[] counts = new int[1000000];
a = new double[dataGridView1.RowCount, 8];
int j1 = 0;
t = new double[k, 7];
// MessageBox.Show(dataGridView1.RowCount.ToString());
do
{
richTextBox4.Clear();
for (int i = 0; i < k; i++)
{
counts[i] = 0;
for (int j = 0; j < 6; j++)
{
c1[i, j] = 0;
}
}
old_error = error; error = 0;
for (int i = 0; i < dataGridView1.RowCount - 1; i++)
{
// textBox1.Text = dataGridView1.Rows[i].Cells[0].ToString();
for (int j = 0; j < 6; j++)
{
// MessageBox.Show(dataGridView1.Rows[i].Cells[j].Value.ToString());
a[i, j] = double.Parse(dataGridView1.Rows[i].Cells[j].Value.ToString());
richTextBox2.AppendText(a[i, j].ToString() + ",");
}
richTextBox2.AppendText("\n");
}
richTextBox1.Clear();
for (int i = 0; i < k; i++)
{
ch = Rnd.Next(0, dataGridView1.RowCount);
try
{
for (int j = 0; j < 6; j++)
{
t[i, j] = double.Parse(dataGridView1.Rows[ch].Cells[j].Value.ToString());
// MessageBox.Show("2 - "+dataGridView1.Rows[ch].Cells[j].Value.ToString());
if (j != 0)
{
richTextBox1.AppendText(ch + ", " + t[i, j].ToString() + "\n");
}
}
}
catch
{
}
}
for (int j = 0; j < dataGridView1.RowCount - 1; j++)
{
for (int i = 0; i < k; i++)
{
for (int m = 1; m < 6; m++)
{
q = (Math.Pow((t[i, m] - a[j, m]), 2));
//MessageBox.Show("res - " + q.ToString());
v = v + q;
q = 0;
}
// MessageBox.Show("total - " + v.ToString());
o = Math.Sqrt(v);
// MessageBox.Show("res1 - " + o.ToString());
if (h > o)
{
s[j] = i;
h = o;
}
v = 0;
o = 0;
}
richTextBox4.AppendText(s[j] + "-");
for (int m = 0; m < 6; m++)
{
c1[s[j], m] = a[j, m];
counts[s[j1]]++;
}
richTextBox4.AppendText((c1[s[j], 0]).ToString());
richTextBox4.AppendText("\n");
error += h;
h = double.MaxValue;
}
for (int i = 0; i < k; i++)
{ /* update all centroids */
for (int j = 1; j < 6; j++)
{
t[i, j] = (counts[i] != 0) ? c1[i, j] / counts[i] : c1[i, j];
}
}
} while (Math.Abs(error - old_error) > f);
}
```