hi am new to java and have a problem in displaying the x and y points on the graph to solve this ax3+bx2=x+d=0

here is the code

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
/**
* PROGRAM: Cubic
* DESCRIPTION: This program solves the cubic Equation for a given range of values and plots the graph...
* AUTHOR: MUCHINDU ADAM
* DATE WRITTEN: 05-04-09
*/
public class CubicEquation extends JApplet implements ActionListener
{
private JLabel B1;
private JLabel B2;
private JTextField R1;
private JLabel B3;
private JTextField R2;
private JLabel B4;
private JTextField R3;
private JLabel B5;
private JTextField R4;
private JLabel B6;
private JTextField R5;
private JLabel B7;
private JTextField R6;
private JLabel B8;
private JLabel B9;
private JButton B10;
private JTextField R17;
private JTextArea R7;



public CubicEquation()
{
B1=new JLabel(" POLYNOMIAL SOLVER/CUBIC EQUATION ");
B2=new JLabel("Enter the value of a:");
R1=new JTextField(2);
B3=new JLabel("Enter the value of b:");
R2=new JTextField(2);
B4=new JLabel("Enter the value of c:");
R3=new JTextField(2);
B5=new JLabel("Enter the value of d:");
R4=new JTextField(2);
B6=new JLabel("Enter the minimum value for the range of X");
R5=new JTextField(2);
B7=new JLabel("Enter the maximum value for the range of X");
R6=new JTextField(2);
B10=new JButton("SOLVE");
R17=new JTextField(20);
R7=new JTextArea();



JPanel DE=new JPanel(new FlowLayout());
DE.add(B2);
DE.add(R1);
DE.add(B3);
DE.add(R2);
DE.add(B4);
DE.add(R3);
DE.add(B5);
DE.add(R4);

JPanel ARK=new JPanel(new FlowLayout());
ARK.add(B6);
ARK.add(R5);
ARK.add(B7);
ARK.add(R6);

JPanel ANS=new JPanel(new FlowLayout());
ANS.add(B10);

JPanel FIN=new JPanel(new FlowLayout());
FIN.add(R7);
FIN.add(R17);

setLayout(new GridLayout(5,1));
add(B1);
add(DE);
add(ARK);
add(ANS);
add(FIN);

B10.addActionListener(this);// Puting a listener to button 10.
}
public void actionPerformed(ActionEvent e)
{

int[]x=new int[5];
int index;
//Geting the values of A to D and the range
int A=Integer.parseInt(R1.getText());
int B=Integer.parseInt(R2.getText());
int C=Integer.parseInt(R3.getText());
int D=Integer.parseInt(R4.getText());
int Min=Integer.parseInt(R5.getText());
int Max=Integer.parseInt(R6.getText());

for(index=0;index < x.length;index++)
{
for(int i=Min;i<=Max;i++)
{
x[index]=i;
//{
}


int F=0,G,H,i;
int[]Ans=new int[5];


// int y=7;
// int index =0;

x[index]=F;
for(F=0;F<x.length;F++)
{

Ans[index]=(A*(F*F*F)+B*(F*F)+C*(F)+D);
// Ans[i]={A*(Min*Min*Min)+B*(Min*Min)+C*(Min)+D};

// int y=A*F+B*G+C*H+(D);
// R7.setText(Integer.toString(y) + "\t");

// Ans[index]++;

//for(Ans[0]=y;Ans[0]<Max-Min; Ans[0]++)

// R7.setText(Integer.toString(Ans.length)+"\t");
}

if(e.getSource()==B10)
{
//Ans[index]=y;
//for(F=y;F<=Max;F++)
//{
//for(index=1;index<=Ans.length;index++)
// {
R7.setText(Integer.toString(Ans[F])+"\t");
index--;
R17.setText(Integer.toString(Ans[2]));
// R7.setText(Integer.toString(y) + "\t");
}

}

}
}

http://www.daniweb.com/forums/thread187065.html may be useful to you

hi, i'm not sure what u want yor program to do. But in these lines where you used 2 for loops , the internal loop is doing really nothing, just assiging the maximum value to x [index].....
hope this will be of some help
for(index=0;index < x.length;index++)
{
for(int i=Min;i<=Max;i++)
{
x[index]=i;
//{
}

hi,the code is to calculate and store the result to the array,then it s now must pass the array to the graph which will produce a cubic cuvre,ploting of the graph is okey just puting the two together,the forloop works aright,