Histogram.h

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#ifndef CondFormats_PhysicsToolsObjects_Histogram_h
#define CondFormats_PhysicsToolsObjects_Histogram_h

#include <vector>
#include <cmath>

namespace PhysicsTools {
namespace Calibration {

template<typename Axis_t>
struct Range {
    inline Range() {}

    template<typename OAxis_t>
    inline Range(const Range<OAxis_t> &orig) :
        min(orig.min), max(orig.max) {}

    inline Range(Axis_t min, Axis_t max) : min(min), max(max) {}

    ~Range() {}

    inline Axis_t width() const { return max - min; }

    Axis_t  min, max;
};

template<typename Value_t, typename Axis_t = Value_t>
class Histogram {
    public:
    typedef PhysicsTools::Calibration::Range<Axis_t> Range;

    Histogram();

    Histogram(const Histogram &orig);

    template<typename OValue_t, typename OAxis_t>
    Histogram(const Histogram<OValue_t, OAxis_t> &orig);

    Histogram(const std::vector<Axis_t> &binULimits);

    template<typename OAxis_t>
    Histogram(const std::vector<OAxis_t> &binULimits);

    template<typename OAxis_t>
    Histogram(unsigned int nBins,
              const PhysicsTools::Calibration::Range<OAxis_t> &range);

    Histogram(unsigned int nBins, Axis_t min, Axis_t max);

    ~Histogram();

    Histogram &operator = (const Histogram &orig);

    template<typename OValue_t, typename OAxis_t>
    Histogram &operator = (const Histogram<OValue_t, OAxis_t> &orig);

    void reset();

    const std::vector<Axis_t> upperLimits() const { return binULimits; }

    Value_t binContent(int bin) const { return binValues[bin]; }
    Value_t value(Axis_t x) const { return binContent(findBin(x)); }
    Value_t normalizedValue(Axis_t x) const
    { return binContent(findBin(x)) / normalization(); }

    Value_t binError(int bin) const { return std::sqrt(binContent(bin)); }
    Value_t error(Axis_t x) const { return binError(findBin(x)); }
    Value_t normalizedError(Axis_t x) const
    { return std::sqrt(binContent(findBin(x))) / normalization(); }

    void setBinContent(int bin, Value_t value);
    void fill(Axis_t x, Value_t weight = 1.0);

    bool empty() const { return binValues.empty(); }
    bool hasEquidistantBins() const { return binULimits.empty(); }
    int numberOfBins() const { return binValues.size() - 2; }

    inline const std::vector<Value_t> &values() const
    { return binValues; }

    void setValues(const std::vector<Value_t> &values);

    template<typename OValue_t>
    void setValues(const std::vector<OValue_t> &values);

    inline Range range() const { return limits; }
    Range binRange(int bin) const;

    int findBin(Axis_t x) const;
    Value_t normalization() const;

    Value_t integral(Axis_t hBound, Axis_t lBound = 0.0, int mode = 1) const;
    Value_t normalizedIntegral(Axis_t hBound, Axis_t lBound = 0.0, int mode = 1) const
    { return integral(hBound, lBound, mode) / normalization(); }

    protected:
    std::vector<Axis_t> binULimits;
    std::vector<Value_t>    binValues;
    Range           limits;

    // transient cache variables
    mutable Value_t     total;
    mutable bool        totalValid;
};

typedef Histogram<float>  HistogramF;
typedef Histogram<double> HistogramD;

} // namespace Calibration
} // namespace PhysicsTools

#include "CondFormats/PhysicsToolsObjects/interface/Histogram.icc"

#endif // CondFormats_PhysicsToolsObjects_Histogram_h