Histogram.hxx

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/*
Copyright (c) 2017, 2025 Matthew H. Reilly (kb1vc)
All rights reserved.
 
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    Redistributions in binary form must reproduce the above copyright
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    the documentation and/or other materials provided with the
    distribution.
 
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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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*/
#pragma once
 
#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 << SoDa::Format("%0 %1 %2\n")
                .addI(i)
                .addF(mid)
                .addI(table[i]); 
      }
 
      of.close();
    }
 
  protected:
    unsigned int * table; 
    double recip_bucket_interval; 
    unsigned int num_buckets; 
    double min, max; 
  }; 
 
}