Histogram.hxx

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/*
Copyright (c) 2017 Matthew H. Reilly (kb1vc)
All rights reserved.

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modification, are permitted provided that the following conditions are
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    Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef HISTOGRAM_HDR
#define HISTOGRAM_HDR
#include <iostream>
#include <fstream>

namespace SoDa {
  class Histogram {
  public:
    Histogram(unsigned int _num_buckets, 
          double _min, double _max) {
      num_buckets = _num_buckets; 
      min = _min; 
      max = _max; 
      table = new unsigned int [num_buckets]; 
      recip_bucket_interval = ((double) num_buckets) / (max - min); 
      for(unsigned int i = 0; i < num_buckets; i++) table[i] = 0; 
    }

    void updateTable(double v) {
      int idx = lround((v  - min) * recip_bucket_interval); 
      if(v > max) table[num_buckets - 1]++; 
      else if(v < min) table[0]++; 
      else table[idx]++; 
    }

    void writeTable(const std::string & fname) {
      std::ofstream of(fname.c_str()); 

      double bucket_interval = 1.0 / recip_bucket_interval; 
      double half_int = 0.5 * bucket_interval; 

      for(unsigned int i = 0; i < num_buckets; i++) {
    double mid = min + half_int + ((double) i) * bucket_interval; 
    if(table[i] != 0) of << boost::format("%d %g %d\n") % i % mid % table[i]; 
      }

      of.close();
    }

  protected:
    unsigned int * table; 
    double recip_bucket_interval; 
    unsigned int num_buckets; 
    double min, max; 
  }; 

}


#endif