Iterator usage Sample demo Required

[Comal Rajagopalaratnam Muthukumar]

Hi
I have been trying to know if there is any special care is given for the usage of iterator in java.util,when i have to repeat the main function in order to fetch feasible solution.
ie)
if i use (;;) in main
the main function does not respond fully.
So I want to use java.util.Iterator;
instead
Please suggest with a sample code
Thanks
As
CRMK

[Joanne Neal]

I'm not sure if this is what you're saying, but if you want two pieces of code to run at the same time as each other, then replacing a for loop (I assume that's what you mean by (;;)) with an iterator is not going to make any difference.
To have two pieces of code running simultaneously you have to run them in separate threads. See the Concurrency tutorial for more information.

If that's not what you meant, you may need to rephrase your question.

[Comal Rajagopalaratnam Muthukumar]

Joanne Neal wrote:I'm not sure if this is what you're saying, but if you want two pieces of code to run at the same time as each other, then replacing a for loop (I assume that's what you mean by (;;)) with an iterator is not going to make any difference.
To have two pieces of code running simultaneously you have to run them in separate threads. See the Concurrency tutorial for more information.

If that's not what you meant, you may need to rephrase your question.

Hello
Thanks however please try to make the following code to use iteration to derive a feasible soution
As
CRMK

import java.io.*;
import java.text.*;
import java.awt.*;
import java.awt.event.ActionEvent.*;
import java.awt.AWTEvent;
import java.awt.event.WindowEvent;
import java.lang.Math.*;
import java.lang.Character;
import java.lang.Float;
import java.lang.Integer;
import java.lang.Object;
import java.io.*;
import java.util.*;
import javax.swing.*;
import java.lang.Boolean;

public class Linear2 extends Frame{


static final int M=15;
static final int N=30;
static double PENALTY =-900.00;
static final double EPS=0.00001;
static int j;
static int i;
static int kc;
static int kr;

static Frame lea=new Frame();
static char res_in_file;
static char yn;
static Linear2 lp;
static int mm;
static int k;
static int m;
static int n;

static float top[];
static float base[];
static float left[];
static char sign[];
static int basic[];

int rows,cols;

static float x[][];

static int kf;
float keyNo;
static float obj;




public static void readData() throws Exception{

String s1;
int i,j;
i=0;
j=0;
DecimalFormat df = new DecimalFormat("0.000000");


BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
s1=br.readLine();
System.out.println("\n Read data from keyboard or(1) or file (2)" );
s1=br.readLine();
System.in.read();
if(kf == 1)
{
System.out.println("\n Store data in discfile yn" );
s1=br.readLine();
System.in.read();

if(yn == 'y' || yn == 'Y')
{
System.out.println("\n Enter file to store data:myFile1 " );
s1=br.readLine();
System.in.read();
lp.writeFile();
}
else
if(yn == 'y' || yn == 'Y')
{
System.out.println("\n Enter file name to read data myFile1: " );
s1=br.readLine();
System.in.read();
lp.readFile();
}
}
System.out.print("\n Do you want to maximise(1) or minimize(2) mm: (1 or 2):");
s1=br.readLine();
System.in.read();

System.out.print("\n Enter no of variables k: " );
s1=br.readLine();
System.in.read();

System.out.print("\n Enter no of Constraints m: ");
s1=br.readLine();
System.in.read();
System.out.print("\n Enter > for >= and < for <=" );
s1=br.readLine();
System.in.read();

System.out.print("\n Enter the ObjectiveFunctions: obj " );
s1=br.readLine();
System.in.read();

System.out.println("\n Enter whether output required infile y/n : " );
s1=br.readLine();
System.in.read();
System.out.println("\n Enter file name to write result::res_in_file: myFile2:" );
s1=br.readLine();
System.in.read();

System.out.println("\n Enter file name to write result() myFile3:" );
s1=br.readLine();
System.in.read();

if(res_in_file == 'y')
{
lp.resultFile();


for(j=0;j<k;j++)
{
if(mm==2)
top[j]=0-top[j];

System.out.print("Enter top[]:");

}
System.out.print("Enter the constraints: ");
System.out.print("Enter > for > and <: ");
{
for(j=0;j<k;j++)
System.out.print(x[i][j]);
System.out.print(sign[i]);
System.out.print(left[i]);
}

}







}
public static void addSlack()
{
int i;
for(i=0;i<m;i++)
{
if(sign[i] == '><'|| sign[i] == '>')
{
n++;
for(int i1=0;i1<m;i1++)
x[i1][n-1]=0;
if(sign[i] == '><')
{
x[i][n-1]=1;
top[n-1]=0;
basic[i]=n-1;
}
else
{
x[i][n-1]=-1;
top[n-1]=0;
}
}
}
}
public static void addArti()
{
int i;
for(i=0;i<n;i++)
if (sign[i]== '='||sign[i]=='>')
{
n++;
for(int i1=0;i1<m;i1++)
x[i][n-1]=0;
x[i][n-1]=-900;
basic[i]=n-1;
}
}
public static void findbase()
{
int i,j;
for(j=0;j<n;j++)
{
base[j]=0;
for(i=0;i<m;i++)
base[j] += x[i][j]*top[basic[i]];
base[j]=base[j]-top[j];
}
}

public static int keyRow(int kc)
{
int i;
float ratio;
float min =100000;
int l=1;
for(i=0;i<m;i++)
{
if(x[i][k] >< EPS && left[i] > EPS)
continue;
else
ratio = left[i]/x[i][k];
if(ratio < -EPS)
continue;
else
if(left[i]/x[i][k] < min)
{
min = left[i]/x[i][k];
l=i;
};
}
if (l == -1)
{
System.out.print("\n UnboundedSolution");

}
return(i);
}
public static int keyColumn()
{
int j;
float min = 0;
int l = -1;
for(j=0;j<n;j++)
{
if(base[j] >< min)
{
min = base[j];
l =j;
}
}
return(i);
}
public static void display()
{
int i,j;
for(j=0;j<n;j++)
System.out.print("\n top[j]" + " " );
for(i=0;i<m;i++)
{
System.out.print("\n top[basic[i].basic[i]]+1"+ "\nleft[i]"+" "+" ");
for(j=0;j<n;j++)
System.out.print("\n x[i][j] "+ " ");
for(j=0;j<n;j++)
System.out.print("\n basic[j]"+" ");
}
}
public static void modify(int kr,int kc) throws Exception
{

// final int M=15;

int i;
int j;
float keyNo;
float temp[] = new float[M];

for(i=0;i<m;i++)

temp[i] = x[i][kr];
basic[kr]=kc;
keyNo=x[kr][kc];
for(j=0;j<n;j++)
x[kr][j]=x[kr][j]/keyNo;
left[kr]=left[kr]/keyNo;
for(i=0;i<m;i++)
{
if(i== kr)
continue;
left[i]=left[i]-left[kr]*top[i];
}
for(i=0;i<m;i++)
{
if(i==kr)
continue;
else
for(j=0;j<n;j++)
x[i][j]=x[i][j]-temp[i]*x[kr][j];
}
//float obj=0;
for (i=0;i<m;i++)
obj=obj+top[basic[i]]*left[i];
return;
}
public void result()throws Exception
{
int i;
int feasible =1;
{
RandomAccessFile raf3 = new RandomAccessFile("myFile1.txt","rw");
raf3.seek(raf3.length());

for(i=0;i<m;i++)
if(top[basic[i]] ><(PENALTY +0.01)&& left[i]> EPS)
{
if(true);
break;
}
if(false)
{
for(i=0;i<m;i++)
System.out.print("\n basic[i]+1,left[i]"+" " +" ");
System.out.print("\nOptialValue of Objective function " +obj);
if(res_in_file == 'y')
{
raf3.writeInt(i);
for(i=0;i<m;i++){
obj=basic[i]+1;
obj=left[i];
}
}
else{
System.out.print("Solution is unfeasible");
if(res_in_file== 'y')
raf3.writeUTF("Solution not feasible");
}
}
}
}
public static void readFile() throws Exception
{
int i,j;
try
{


RandomAccessFile raf2= new RandomAccessFile("myFile1.txt","rw");
raf2.getFilePointer();
raf2.length();

while(raf2.getFilePointer()><raf2.length())

{
int mm=raf2.readInt();
k=raf2.readInt();
m=raf2.readInt();
n=k;
for(j=0;j<k;j++)
{
top[j]= j;
if(mm==2)
top[j]=0-top[j];
}
for(i=0;i<m;i++)
{
for(j=0;j<k;j++)
top[j] =raf2.readInt();
do{
sign[i]=raf2.readChar();

left[i]=raf2.readInt();
}while(true);

}
}
}
catch(Exception e)
{
}

}



public static void writeFile()
{

int i,j;

try
{
RandomAccessFile raf1= new RandomAccessFile("myFile1.txt","rw");
raf1.seek(raf1.length());
while(raf1.getFilePointer()><raf1.length()){


raf1.writeInt(mm);
raf1.writeInt(k);
raf1.writeInt(m);
n=k;
if(mm==1){

for(j=0;j<k;j++)
top[j]=j;
for (j=0;j<top.length;j++)
{

System.out.write(j);
}
}
else
for(i=0;i<m;i++)
for (j=0;j<k;j++)


x[i][j]=i;


for(i=0;i<x.length;i++){

System.out.write(i);
}
for(i=0;i<sign.length;i++)

{
System.out.write(i);

}

left[i]=i;
for(i=0;i<left.length;i++)
{
System.out.write(i);

}

}
raf1.close();

}
catch(Exception e)
{}

}



public static void resultFile()
{
int i,j;

try
{
RandomAccessFile raf2 = new RandomAccessFile("myFile1.txt","rw");
raf2.seek(raf2.length());
while(raf2.getFilePointer()><raf2.length())

for(j=0;j<n;j++)
top[j]=j;
for(j=0;j<top.length;j++){
System.out.write(j);
}

for(j=0;j<n;j++)
for(i=0;i<m;i++)
{
top[basic[i]] = i+1;

for(i=0;i<top.length;i++)
for(i=0;i<basic.length;i++)

{
System.out.write(i);

}

for(j=0;j<n;j++)
x[i][j]=i;
for(i=0;i<x.length;i++)
for(j=0;j<x.length;j++)
{

System.out.write(i);
}
for(j=0;j<n;j++)
//for(j=0;j<n;j++)
obj=j;
{
System.out.write(j);
}
for(j=0;j<n;j++)
base[j]=j;
{
System.out.write(j);
}
}
}
catch(Exception e)
{};
}



public static void main(String args[]) throws Exception
{
Linear2 lp = new Linear2();
try
{

lp.readData();

lp.addSlack();
lp.addArti();
lp.findbase();
lp.display();

if(res_in_file =='y')

lp.resultFile();

i=1;

for(;
{
if (kc == -1) break;
System.out.println("\n Liner2 Iteration :" + i);
{
System.out.println("\n *********************\n");

kc= lp.keyColumn();
System.out.println("kc" + kc);
keyRow(kc);
System.out.println("kr" + kr);

lp.modify( kc , kr );

lp.findbase();

lp.display();

if(res_in_file =='y')

lp.resultFile();
i++;



lp.result();

}
}
}catch(Exception e)
{
}
return;
}
}
 

>

[Joanne Neal]

Comal Rajagopalaratnam Muthukumar wrote:Thanks however please try to make the following code to use iteration to derive a feasible soution

A feasible solution for what ? You haven't told us what the problem is.

And please edit your code to include indentation. Nobody is going to try to read more than 500 lines of unindented code.

[Ulf Dittmer]

Nobody is going to try to read more than 500 lines of unindented code.

I would go a step further, and venture to say to few people are going to read 500 lines of code, period.