Histogram.h

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// $Maintainer: Stephan Aiche$
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#ifndef OPENMS_MATH_STATISTICS_HISTOGRAM_H
#define OPENMS_MATH_STATISTICS_HISTOGRAM_H

//OpenMS
#include <OpenMS/CONCEPT/Types.h>
#include <OpenMS/CONCEPT/Exception.h>

//STL
#include <vector>
#include <cmath>
#include <limits>
#include <iostream>
#include <algorithm>

namespace OpenMS
{
  namespace Math
  {

    template <typename ValueType = UInt, typename BinSizeType = DoubleReal>
    class Histogram
    {
public:

      typedef typename std::vector<ValueType>::const_iterator ConstIterator;


      Histogram() :
        min_(0),
        max_(0),
        bin_size_(0)
      {
      }

      Histogram(const Histogram & histogram) :
        min_(histogram.min_),
        max_(histogram.max_),
        bin_size_(histogram.bin_size_),
        bins_(histogram.bins_)
      {
      }

      Histogram(BinSizeType min, BinSizeType max, BinSizeType bin_size) :
        min_(min),
        max_(max),
        bin_size_(bin_size)
      {
        if (bin_size_ <= 0)
        {
          throw Exception::OutOfRange(__FILE__, __LINE__, __PRETTY_FUNCTION__);
        }
        else
        {
          // if max_ == min_ there is only one bin
          if (max_ != min_)
          {
            bins_ = std::vector<ValueType>(Size(ceil((max_ - min_) / bin_size_)), 0);
          }
          else
          {
            bins_ = std::vector<ValueType>(1, 0);
          }
        }
      }

      virtual ~Histogram()
      {
      }


      BinSizeType minBound() const
      {
        return min_;
      }

      BinSizeType maxBound() const
      {
        return max_;
      }

      ValueType maxValue() const
      {
        return *(std::max_element(bins_.begin(), bins_.end()));
      }

      ValueType minValue() const
      {
        return *(std::min_element(bins_.begin(), bins_.end()));
      }

      BinSizeType binSize() const
      {
        return bin_size_;
      }

      Size size() const
      {
        return bins_.size();
      }

      ValueType operator[](Size index) const
      {
        if (index >= bins_.size())
        {
          throw Exception::IndexOverflow(__FILE__, __LINE__, __PRETTY_FUNCTION__);
        }
        return bins_[index];
      }

      BinSizeType centerOfBin(Size bin_index) const
      {
        if (bin_index >= bins_.size())
        {
          throw Exception::IndexOverflow(__FILE__, __LINE__, __PRETTY_FUNCTION__);
        }

        return (BinSizeType)(min_ + ((BinSizeType)bin_index + 0.5) * bin_size_);
      }

      ValueType binValue(BinSizeType val) const
      {
        return bins_[valToBin_(val)];
      }

      Size inc(BinSizeType val, ValueType increment = 1)
      {
        Size bin_index = valToBin_(val);
        bins_[bin_index] += increment;
        return bin_index;
      }

      void reset(BinSizeType min, BinSizeType max, BinSizeType bin_size)
      {
        min_ = min;
        max_ = max;
        bin_size_ = bin_size;
        bins_.clear();

        if (bin_size_ <= 0)
        {
          throw Exception::OutOfRange(__FILE__, __LINE__, __PRETTY_FUNCTION__);
        }
        else
        {
          // if max_ == min_ there is only one bin
          if (max_ != min_)
          {
            bins_.resize(Size(ceil((max_ - min_) / bin_size_)), 0);
          }
          else
          {
            bins_.resize(1, 0);
          }
        }
      }


      bool operator==(const Histogram & histogram) const
      {
        return min_ == histogram.min_ &&
               max_ == histogram.max_ &&
               bin_size_ == histogram.bin_size_ &&
               bins_ == histogram.bins_;
      }

      bool operator!=(const Histogram & histogram) const
      {
        return !operator==(histogram);
      }

      Histogram & operator=(const Histogram & histogram)
      {
        if (&histogram == this) return *this;

        min_ = histogram.min_;
        max_ = histogram.max_;
        bin_size_ = histogram.bin_size_;
        bins_ = histogram.bins_;

        return *this;
      }



      inline ConstIterator begin() const { return bins_.begin(); }

      inline ConstIterator end() const { return bins_.end(); }

      void applyLogTransformation(BinSizeType multiplier)
      {
        for (typename std::vector<ValueType>::iterator it = bins_.begin(); it != bins_.end(); ++it)
        {
          *it = (ValueType)(multiplier * log((BinSizeType)(*it + 1.0f)));
        }
      }

protected:
      BinSizeType min_;
      BinSizeType max_;
      BinSizeType bin_size_;
      std::vector<ValueType> bins_;
      Size valToBin_(BinSizeType val) const
      {
        //std::cout << "val: " << val << " (min: " << min_ << " max: " << max_ << ")" << std::endl;
        if (val < min_ || val > max_)
        {
          throw Exception::OutOfRange(__FILE__, __LINE__, __PRETTY_FUNCTION__);
        }
        if (val == max_)
        {
          return Size(bins_.size() - 1);
        }
        else
        {
          return (Size) floor((val - min_) / (max_ - min_) * bins_.size());
        }
      }

    };

    template <typename ValueType, typename BinSizeType>
    std::ostream & operator<<(std::ostream & os, const Histogram<ValueType, BinSizeType> & hist)
    {
      for (Size i = 0; i < hist.size(); ++i)
      {
        os << hist.centerOfBin(i) << "\t"<< hist[i] << std::endl;
      }
      return os;
    }

  }   // namespace Math

} // namespace OpenMS

#endif // OPENMS_MATH_STATISTICS_HISTOGRAM_H