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Coco - A full production planning example

Description
The Coco productional planning problem: multi-item, multi-period, multi-site production planning. A sequence of model versions show how the model was developed, to (a) use more sophisticated modeling features and (b) to extend the model, taking it from a simple linear model to one with fixed prices and logical decisions.
  1. xbcoco1: initial formulation, data, variables and constraints fixed
  2. xbcoco2: use parameters, data tables and subscripted variables.

    read data tables in from text data files (short-term planning).
  3. xbcoco3: like xbcoco2.c, but several time periods (mid-term planning).
  4. xbcoco : complete problem, data defined in the model definition (long-term planning).


Source Files

Data Files





xbcoco1.cs

/********************************************************
  Xpress-BCL C# Example Problems
  ==============================

  file xbcoco1.cs
  ```````````````
  Coco Problem Phase 1. 
  Initial formulation: data, variables and 
  constraints fixed.

  (c) 2008 Fair Isaac Corporation
      authors: S.Heipcke, D.Brett.
********************************************************/

using System;
using System.Text;
using System.IO;
using BCL;


namespace Examples
{
    public class TestCoco1
    {
        public static void Main()
        {
            XPRB.init();
            XPRBvar make11,make21,make12,make22;
            XPRBprob p = new XPRBprob("Coco1");         /* Initialize a new problem in BCL */

            /****VARIABLES****/
            make11 = p.newVar("make11"); /* Amount of prod. 1 to make at factory 1 */
            make21 = p.newVar("make21"); /* Amount of prod. 2 to make at factory 1 */
            make12 = p.newVar("make12"); /* Amount of prod. 1 to make at factory 2 */
            make22 = p.newVar("make22"); /* Amount of prod. 2 to make at factory 2 */

            /****OBJECTIVE****/
            /* Define & set objective function: maximize total profit */ 
            p.setObj(p.newCtr("OBJ", 50*make11 + 125*make21 + 47*make12 + 132*make22));

            /****CONSTRAINTS****/
            p.newCtr("MxMake1", make11+make21 <= 400);  /* Capacity limit at factory 1 */

            p.newCtr("MxMake2", make12+make22 <= 500);  /* Capacity limit at factory 2 */

            p.newCtr("MxSell1", make11+make12 <= 650);  /* Limit on the amount of 
                                        prod. 1 to be sold */

            p.newCtr("MxSell2", make21+make22 <= 600);  /* Limit on the amount of 
                                        prod. 2 to be sold */

            /****SOLVING + OUTPUT****/
            p.setSense(BCLconstant.XPRB_MAXIM);      /* Choose the sense of the optimization */
            p.lpOptimize();                 /* Solve the LP-problem */
            System.Console.WriteLine("Objective: " + p.getObjVal());   /* Get objective value */

            /* Print out the solution values for all variables */
            System.Console.WriteLine(make11.getName() + ": " + make11.getSol());
            System.Console.WriteLine(make21.getName() + ": " + make21.getSol());
            System.Console.WriteLine(make12.getName() + ": " + make12.getSol());
            System.Console.WriteLine(make22.getName() + ": " + make22.getSol());

            return;
        }

    }

}
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