test_func_fw.hpp

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#ifndef MLPACK_CORE_OPTIMIZERS_FW_TEST_FUNC_FW_HPP
#define MLPACK_CORE_OPTIMIZERS_FW_TEST_FUNC_FW_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace optimization {

class TestFuncFW
{
 public:
  TestFuncFW()
  {/* Nothing to do. */}

  double Evaluate(const arma::mat& coords)
  {
    double f = std::pow(coords[0] - 0.1, 2);
    f += std::pow(coords[1] - 0.2, 2);
    f += std::pow(coords[2] - 0.3, 2);
    return f;
  }

  void Gradient(const arma::mat& coords, arma::mat& gradient)
  {
    gradient.set_size(3, 1);
    gradient[0] = coords[0] - 0.1;
    gradient[1] = coords[1] - 0.2;
    gradient[2] = coords[2] - 0.3;
  }
};

}  // namespace optimization
}  // namespace mlpack

#endif