histogram.h

// ---------------------------------------------------------------------
//
// Copyright (C) 1999 - 2017 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------

#ifndef dealii_histogram_h
#define dealii_histogram_h


#include <deal.II/base/config.h>
#include <deal.II/base/exceptions.h>
#include <deal.II/lac/vector.h>
#include <vector>
#include <string>

DEAL_II_NAMESPACE_OPEN


class Histogram
{
public:
  enum IntervalSpacing
  {
    linear,
    logarithmic
  };


  template <typename number>
  void evaluate (const std::vector<Vector<number> > &values,
                 const std::vector<double>                   &y_values,
                 const unsigned int                           n_intervals,
                 const IntervalSpacing                        interval_spacing = linear);

  template <typename number>
  void evaluate (const Vector<number>          &values,
                 const unsigned int             n_intervals,
                 const IntervalSpacing          interval_spacing = linear);

  void write_gnuplot (std::ostream &out) const;

  static std::string get_interval_spacing_names ();

  static IntervalSpacing parse_interval_spacing (const std::string &name);

  std::size_t memory_consumption () const;

  DeclExceptionMsg (ExcEmptyData,
                    "Your input argument to this function does not appear to "
                    "have any data in it.");
  DeclException2 (ExcIncompatibleArraySize,
                  int, int,
                  << "The two array sizes " << arg1 << " and " << arg2
                  << " must match, but don't.");
  DeclException1 (ExcInvalidName,
                  std::string,
                  << "The given name <" << arg1
                  << "> does not match any of the known formats.");

private:
  struct Interval
  {
    Interval (const double left_point,
              const double right_point);

    std::size_t memory_consumption () const;

    double       left_point;

    double       right_point;

    unsigned int content;
  };

  template <typename number>
  static bool logarithmic_less (const number n1,
                                const number n2);

  std::vector<std::vector<Interval> > intervals;

  std::vector<double>            y_values;
};


DEAL_II_NAMESPACE_CLOSE

#endif