square.cpp

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#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <iostream>
#include "conopt.hpp"
 
class Sq_ModelData : public ConoptModelData
{
public:
   Sq_ModelData() {}

   void buildModel()
   {
      /*   Information about Variables:                                */
      /*   Default: Lower = -Inf, Curr = 0, and Upper = +inf.          */
      /*   Default: the status information in Vsta is not used.        */
      /*                                                               */
      /*   Model  x0 + x1 = 10                                         */
      /*          x0 - x1 = 0                                          */
      /*                                                               */
      addVariable(-Conopt::Infinity, Conopt::Infinity, 0.0); // x0
      addVariable(-Conopt::Infinity, Conopt::Infinity, 0.0); // x1
 
      /*   Information about Constraints:                              */
      /*   Default: Rhs = 0                                            */
      /*   Default: the status information in Esta and the function    */
      /*            value in FV are not used.                          */
      /*   Default: Type: There is no default.                         */
      /*            0 = Equality,                                      */
      /*            1 = Greater than or equal,                         */
      /*            2 = Less than or equal,                            */
      /*            3 = Non binding.                                   */
      /*                                                               */
      /*   Nonlinearity Structure: L = 0 are linear and NL = 1 are nonlinear */
      /*   Although the model is linear we label constraint 1 as nonlinear */
      /*   Value (Linear only)                                         */
      /*        X[0]  X[1]                                             */
      /*   0:    1     1                                               */
      /*   1:    NL    NL                                              */
      /*                                                               */
      /*                                                               */
      /*   Constraint 0                                                */
      /*   Rhs = 10 and type Eguality                                  */
      /*                                                               */
      addConstraint(ConoptConstraintType::Eq, 10.0, {0, 1}, {1, 1}, {0, 0});
      /*                                                               */
      /*   Constraint 1                                                */
      /*   Rhs = 0 and type Equality                                   */
      /*                                                               */
 
      addConstraint(ConoptConstraintType::Eq, 0.0, {0, 1}, {0, 0}, {1, 1});
   }

   int FDEval(const double x[], double *g, double jac[], int rowno, const int jacnum[], int mode,
         int ignerr, int *errcnt, int numvar, int numjac, int thread) override
   {
      /*                                                                   */
      /*   Row 0: linear                                                   */
      /*                                                                   */
      if (rowno == 0)
      {
         return 1; /* This should not happen                             */
      }
      /*                                                                   */
      /*   Row 1: The production function is nonlinear                     */
      /*                                                                   */
      else if (rowno == 1)
      {
         /*                                                                   */
         /*   Mode = 1 or 3: Function value                                   */
         /*                                                                   */
         if (mode == 1 || mode == 3)
            *g = x[0] - x[1];
         /*                                                                   */
         /*   Mode = 2 or 3: Derivatives                                      */
         /*                                                                   */
         if (mode == 2 || mode == 3)
         {
            jac[0] = 1.;
            jac[1] = -1.;
         }
      }
      return 0;
   }
};
 
#include "std.cpp"

int main(int argc, char **argv)
{
   int COI_Error = 0;
 
   // getting the program name from the executable path
   std::string pname = getProgramName(argv[0]);
 
   // initialising the Conopt Object
   Conopt conopt(pname);
   Sq_ModelData modeldata;
   Tut_MessageHandler msghandler(pname);
 
   // adding the message handler to the conopt interface
   conopt.setMessageHandler(msghandler);
 
   // building the model
   modeldata.buildModel();
 
   // loading the model in the conopt object
   conopt.loadModel(modeldata);
 
   // tell conopt this is a square system
   conopt.squareModel(1);
 
#if defined(CONOPT_LICENSE_INT_1) && defined(CONOPT_LICENSE_INT_2) && defined(CONOPT_LICENSE_INT_3) && defined(CONOPT_LICENSE_TEXT)
   std::string license = CONOPT_LICENSE_TEXT;
   COI_Error += conopt.setLicense(CONOPT_LICENSE_INT_1, CONOPT_LICENSE_INT_2, CONOPT_LICENSE_INT_3, license);
#endif
 
   if (COI_Error)
      cpp_log(
            conopt, "Skipping COI_Solve due to license error. COI_Error = " + std::to_string(COI_Error), COI_Error);
 
   COI_Error = conopt.solve(); /* Optimize                      */
 
   if (COI_Error)
   {
      cpp_log(conopt, "Errors encountered during solution", COI_Error);
   }
   // checking the statuses and objective value
   else if (conopt.modelStatus() != 16 || conopt.solutionStatus() != 1)
   {
      cpp_log(conopt, "Solver or Model status not as expected (1,16)", -1);
   }
 
   // printing the final status of the optimisation
   conopt.printStatus();
 
   cpp_log(conopt, "Successful Solve", COI_Error);
}