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// Example:

class ProblemSystem : public OptimizerSystem {
public:


   int objectiveFunc(  const Vector & newControllerParameters, bool new_coefficients, Real& f ) const {
     // 1 . Updating newControllerParameters for muscle
   //  2. Adding an analysis
    // 3. integrating states
    // 4. From states ( from analysis)  formulate the f (objective function), and get x to minimise
           f =  [x] ;
      return( 0 ); 
   }

  int constraintFunc( const Vector &newControllerParameters, bool new_coefficients, Vector &constraints)  const{

       // 1 . Updating newControllerParameters for muscle
   //  2. Adding an analysis
    // 3. integrating states
    // 4. From analysis, states formulate the f (objective function), and get x 
      
      constraints[0] = x[0] - 25.0;

      return(0);
  }

    ProblemSystem( const int numParams, const int numEqualityConstraints) :
        OptimizerSystem( numParams ) 
    {
        setNumEqualityConstraints( numEqualityConstraints );
       
    }

};