source: branches/peters_vector/lib/classifier/KernelLookup.h @ 470

// $Id: KernelLookup.h 470 2005-12-19 19:46:50Z peter $

#ifndef _theplu_classifier_kernel_lookup_
#define _theplu_classifier_kernel_lookup_

#include <c++_tools/classifier/Kernel.h>
#include <c++_tools/classifier/DataLookup2D.h>
#include <vector>

namespace theplu {
namespace classifier {

  class KernelFunction;

  ///
  ///   @brief View into sub Kernel
  ///
  class KernelLookup : public DataLookup2D 
  {
    
  public:
    
    ///
    /// Constructor
    ///
    KernelLookup(const Kernel&);

    /// 
    /// Contructor taking the Kernel to view into, row index vector,
    /// and column index vector. 
    ///
    /// @note For training usage row index shall always be equal to
    /// column index.
    ///
    KernelLookup(const Kernel& kernel, const std::vector<size_t>& row, 
               const std::vector<size_t>& column);
    
    /// 
    /// Copy constructor
    ///
    KernelLookup(const KernelLookup&);

    ///
    /// @return element at position (\a row, \a column) in the Kernel
    /// matrix
    ///
    inline double operator()(const size_t row,const size_t column) const
    { return (*kernel_)(row_index_[row],column_index_[column]); }

    

  private:
    ///
    /// Default constructor. Not implemented.
    ///
    KernelLookup(void);

    const Kernel* kernel_;

  }; // class KernelLookup

}} // of namespace classifier and namespace theplu

#endif