add matrix data and stored it in 2-dimensional array in c#

Nov 17 2010 8:33 PM

hi, i need help on to receive input from user and stored it in array. i already tru to code  but it does not return result, and display result. can someone help me. thank you.

input: 3,4

          8,2

          6,7

listbox2 : place to insert input matrix

listbox1 : to display input matrix

btnAdd : to add input matrix and stored in nums array

btnCompute : to compute the average , variance result

here is my code;


 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Mahalanobis_Distance
{
public partial class Form1 : Form
{
private int[,] nums;
private int _count = 0;
int x, y;


public Form1()
{
InitializeComponent();
}

private void listBox2_KeyPress(object sender, KeyPressEventArgs e)
{
if (!Char.IsDigit(e.KeyChar) && e.KeyChar != Char.Parse(","))
e.Handled = true;
}


// Compute and display result
private void btnCompute_Click(object sender, EventArgs e)
{

meanX1.Text = AverageX(nums).ToString();
variance.Text = varianceX(nums).ToString();
// stdDev.Text = stdDeviationOfX;
}


// Calculate standard Deviation Value
private double stdDeviation (double varianceX)
{

double stdDevX = Math.Sqrt(varianceX);
return stdDevX;

}


// Calculate Variance Value
private double varianceX(int[,] nums)

{
int NumMatrix =0;
double varX =0;
double sumSquare=0;


// Get the Means@Average of X values
double avgX = AverageX(nums);
// Declare the total Matrix
NumMatrix = nums.Length;

// Calculate the variance

for (int i = 0; i <= NumMatrix; i++)
{
sumSquare += Math.Pow((double)nums[i, 0]- avgX, 2);
}
varX= sumSquare/NumMatrix;
return varX;

}


// Average value of X matrik
private double AverageX(int[,] nums)
{

double avgValueX = 0;
double sumValueX = 0;


for (int i = 0; i <=nums.GetUpperBound(0); i++)
{
// Total Value Matrix X
sumValueX += (double)nums[i, 0];

}

avgValueX = sumValueX / (nums.GetUpperBound(0) + 1);
return avgValueX;

}



// insert input matrix example (7,8) in listBox and stored in 2-dimensional array

private void btnAdd_Click(object sender, EventArgs e)
{
nums = new int[listBox2.Items.Count, 2];

for (int i = 0; i < this.listBox2.Items.Count; i++)
{
if (_count < 20 && this.listBox2.Items[i].ToString() != "" && this.listBox2.Items[i].ToString().Contains(","))
{
string t = this.listBox2.Items[i].ToString();

string sx = t.Substring(0, t.IndexOf(","));
Int32.TryParse(sx, out x);

t = t.Substring(t.IndexOf(",") + 1);
Int32.TryParse(t, out y);


this.nums[_count, 0] = x;
this.nums[_count, 1] = y;

_count++;

}
}

}



// Show input matrix in ListBox2
private void showMatrixList(int[,] nums)
{
for (int i = 0; i < listBox2.Items.Count; i++)
{
this.listBox1.Items.Add("X:" + x.ToString() + "; Y:" + y.ToString());
}
}



}
}

really appreciate for the help