chiSquare.h

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#ifndef GUM_CHI_SQUARE_H
#  define GUM_CHI_SQUARE_H

#  include <agrum/core/math/math.h>
#  include <agrum/core/hashTable.h>


namespace gum {

  class ChiSquare {
    public:
    static double probaChi2(double x, Size df);

    private:

    static constexpr double __Z_MAX = 6.0;

    static constexpr double __CHI_EPSILON = 0.000001;

    static constexpr double __CHI_MAX = 99999.0;

    static constexpr double __LOG_SQRT_PI = 0.5723649429247000870717135;

    static constexpr double __I_SQRT_PI = 0.5641895835477562869480795;

    static constexpr double __BIGX = 20.0;




    static double __exp(double x) { return (((x) < -__BIGX) ? 0.0 : exp(x)); }

    static double __probaZValue(double z);
  };

} /* namespace gum */

#endif   // GUM_CHI_SQUARE_H


// static HashTable<std::pair<double, unsigned long>, double> __chi2Cache;
// static HashTable<double, double> __ZCache;
// static Idx nbZ;
// static Idx nbChi;
// static Idx nbZt;
// static Idx nbChit;