Error in findEnteringColumn

[miguel14]

I use your code, and this have issues when I run this program

Maximize p = x + y subject to 2x + y <= 4, x + 2y <= 3

I solve it changing findEnteringColumn function

`// finds the next entering column private int findEnteringColumn(){ //float[] values = new float[cols]; //int location = 0;

    int count = 0; 
    for(int pos = 0; pos < cols-1; pos++){
        if(table[rows-1][pos] < 0){
            return pos;
            //System.out.println("negative value found");
            //count++;
        }
    }

    return -1; // This case never exist

    /*
    if(count > 1){
        for(int i = 0; i < cols-1; i++)
            values[i] = Math.abs(table[rows-1][i]);
        location = findLargestValue(values);
    } else location = count - 1;

    return location;
   */
}`

To validate I use this web https://www.zweigmedia.com/RealWorld/simplex.html

My complete code is here

`/*

• To change this license header, choose License Headers in Project Properties.
• To change this template file, choose Tools | Templates
• and open the template in the editor. */ package lp.LPObjects;

import lp.LPObjects.Simplex.ERROR;

/**

• Use this class to test LP programs

• @author Miguel Angel Ramos Valdovinos */ public class prueba {

  public static void main(String[] args) {

  float[][] table = new float[3][6];
  
  table[0][0] = 2;
  table[0][1] = 1;
  table[0][2] = 1;
  table[0][3] = 0;
  table[0][4] = 0;
  table[0][5] = 4;
  
  table[1][0] = 1;
  table[1][1] = 2;
  table[1][2] = 0;
  table[1][3] = 1;
  table[1][4] = 0;
  table[1][5] = 3;
  
  table[2][0] = -1;
  table[2][1] = -1;
  table[2][2] = 0;
  table[2][3] = 0;
  table[2][4] = 1;
  table[2][5] = 0;
  
  Simplex solv = new Simplex(2, 5);
  solv.fillTable(table);
  solv.print();
  
  boolean cont = true;
  while (cont){
      ERROR res = solv.compute();
      if (res == ERROR.IS_OPTIMAL || res == ERROR.UNBOUNDED){
          cont = false;
      }
      solv.print();
  }

  }

} `

[mik30s]

Ok, I'll fix it up. Thanks

[MiKaminskas]

@miguel14 could you please again upload somethere your fix? All your links is broken :(

[miguel14]

@MiKaminskas Hi, I found several bugs, so I better used the solver of CommonsMath3 of Apache. Sorry I delete the code.

http://commons.apache.org/proper/commons-math/