Gradient.h

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// 
//      Minotaur -- It's only 1/2 bull
// 
//      (C)opyright 2009 - 2025 The Minotaur Team.
//
 
#ifndef MINOTAURGRADIENT_H
#define MINOTAURGRADIENT_H
 
#include "linalg/Vector.h"
#include "Variable.h"
 
namespace Minotaur {
 
  class Gradient {
    public:
      Gradient() {};
 
      // only the following coordinates have non-zero components in the
      // gradient.
      //virtual VariableIterator varsBegin() { return vars_.begin(); }
      //virtual VariableIterator varsEnd() { return vars_.end(); }
 
      // initialize
      virtual void initialize() {};
 
      // get no. of nonzeros in the gradient vector
      virtual UInt getNumNz() const {};
 
      // evaluate gradient at x
      virtual LinearAlgebra::ConstDoubleVectorPtr 
        eval(const std::vector<double> &x) const { assert(!"implement me!"); }
 
      // evaluate gradient at x
      virtual LinearAlgebra::ConstDoubleVectorPtr 
        eval (LinearAlgebra::ConstDoubleVectorPtr x) { assert(!"implement me!"); }
      //virtual bool isZero() const { return true; }
 
    protected:
      // LinearGradientPtr lgrad_;
      // QuadraticGradientPtr qgrad_;
  };
 
  typedef Gradient* GradientPtr;
  typedef const Gradient* ConstGradientPtr;  
}
#endif