src/Quantise.h

/*  -*- C++ -*-

    textIR - A fast text document retrieval engine

    Copyright (C) 2005-2009 Laurence Park

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

    File information:
    $Header: /home/staff/lapark/cvsroot/web_search/textIR/src/Quantise.h,v 1.3 2009/10/08 06:41:30 lapark Exp $
*/

#ifndef QUANTISE_H
#define QUANTISE_H

class Quantise {
public:

  Quantise(int levels, float lower, float upper);

  Quantise(void);
  virtual ~Quantise(void);

  void calculateBounds(int levels, float lower, float upper);

  virtual int convertToInt(float value);

  virtual float convertToFloat(int value);

  void buildLookUpTable(void);

  float useLookUpTable(int value);

  float lowerBound(void);

  float upperBound(void);

  int levels(void);

private:
  int _levels;
  float _lower;
  float _upper;

  float _factor;
  float _logLower;

  float *_quantiseTable;
};

#endif

---