norm.hpp

dysii是一款非常出色的滤波函数库

#ifndef INDII_ML_AUX_NORM_HPP
#define INDII_ML_AUX_NORM_HPP

#include "vector.hpp"

namespace indii {
  namespace ml {
    namespace aux {
/**
 * Vector norm.
 *
 * @author Lawrence Murray <[e-mail]>
 * @version $Rev: 404 $
 * @date $Date: 2008-03-05 14:52:55 +0000 (Wed, 05 Mar 2008) $
 */
class Norm {
public:
  /**
   * Evaluate the norm.
   *
   * @param x \f$\mathbf{x}\f$; a vector.
   *
   * @return \f$\|\mathbf{x}\|\f$; the norm of the vector.
   */
  virtual double operator()(const vector& x) const = 0;
  
  /**
   * Generate a random unit vector from a uniform distribution over the
   * unit vectors in the normed vector space.
   *
   * @param N Dimensionality of the normed vector space.
   *
   * @return Random unit vector of length N.
   */
  virtual vector sample(const unsigned int N) const = 0;
  
};

    }
  }
}

#endif