kernel-matrix.h

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// Copyright 2007, Massachusetts Institute of Technology.
// The use of this code is permitted for research only. There is
// absolutely no warranty for this software.
//
// Author: John Lee (jjl@mit.edu)
//
#ifndef KERNEL_KERNEL_MATRIX_H
#define KERNEL_KERNEL_MATRIX_H

#include <vector>
#include <string>
#include <iostream>

using namespace std;

namespace libpmk_util {
class KernelMatrix {
public:
  KernelMatrix() { }

  KernelMatrix(int size);

  int size() const;

  void Normalize();


  void NormalizeByMinCardinality(const vector<int>& cards);


  void Resize(int new_size);


  double& at(int row, int col);

  double at(int row, int col) const;


  void WriteToStream(ostream& output_stream) const;


  void WriteToFile(const char* filename) const;


  void ReadFromStream(istream& input_stream);


  void ReadFromFile(const char* filename);

private:
  // Internally, we represent a kernel matrix as a triangle. Row 0
  // has 1 entry, row 1 has 2 entries, etc.
  vector<vector<double> > matrix_;

};
}  // namespace libpmk_util

#endif  // KERNEL_KERNEL_MATRIX_H

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