diracpdf.hpp

来自「dysii是一款非常出色的滤波函数库」· HPP 代码 · 共 101 行

#ifndef INDII_ML_AUX_DIRACPDF_HPP
#define INDII_ML_AUX_DIRACPDF_HPP

#include "Pdf.hpp"

namespace indii {
  namespace ml {
    namespace aux {

/**
 * Dirac \f$\delta\f$-function probability density.
 *
 * @author Lawrence Murray <[e-mail]>
 * @version $Rev: 341 $
 * @date $Date: 2007-10-31 16:07:59 +0000 (Wed, 31 Oct 2007) $
 *
 * Supports serialization through the Boost.Serialization library.
 */
class DiracPdf : public Pdf, public vector {
public:
  /**
   * Default constructor.
   *
   * Initialises the Dirac with zero dimensions. This should generally
   * only be used when the object is to be restored from a
   * serialization. Indeed, there is no other way to resize the Dirac
   * to nonzero dimensionality except by subsequently restoring from a
   * serialization.
   */
  DiracPdf();

  /**
   * Constructor.
   *
   * @param x The expectation of the Dirac.
   */
  DiracPdf(const vector& x);

  /**
   * Construct Dirac given dimensionality. The expectation remains
   * uninitialised, and should be set with setExpectation().
   *
   * @param N \f$N\f$; number of dimensions of the Dirac.
   */
  DiracPdf(unsigned int N);

  virtual unsigned int getDimensions() const;

  virtual void setDimensions(const unsigned int N,
      const bool preserve = false);

  /**
   * Get the expected value of the Dirac.
   *
   * @return \f$\mathbf{\mu}\f$; expected value of the Dirac.
   */
  virtual const vector& getExpectation() const;

  /**
   * (Don't) get the covariance of the Dirac.
   *
   * @return \f$\mathbf{\Sigma}\f$; covariance of the Dirac.
   */
  virtual const symmetric_matrix& getCovariance() const;

  virtual const vector& getExpectation();

  virtual const symmetric_matrix& getCovariance();

  virtual vector sample();

  virtual double densityAt(const vector& x);

private:
  /**
   * Serialize, or restore from serialization.
   */
  template<class Archive>
  void serialize(Archive& ar, const unsigned int version);

  /*
   * Boost.Serialization requirements.
   */
  friend class boost::serialization::access;

};
      
    }
  }
}

#include "boost/serialization/base_object.hpp"

template<class Archive>
void indii::ml::aux::DiracPdf::serialize(Archive& ar,
    const unsigned int version) {
  ar & boost::serialization::base_object<indii::ml::aux::vector>(*this);
}

#endif