PolyGamma.h

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#ifndef POLYGAMMA_H
#define POLYGAMMA_H


// ----------------------------------------------------------------------
//
// Bridge object between C++ code and the GSL PolyGamma functions
//
// ----------------------------------------------------------------------

#ifndef ZMENVIRONMENT_H
  #include "ZMutility/ZMenvironment.h"
#endif
#include <utility>
#include <complex>

ZM_BEGIN_NAMESPACE( zmsf )      /*  namespace zmsf  {  */

typedef std::pair<double,double> Dpair;


struct PolyGamma {

  static double DiGamma( const int n );

  static Dpair DiGammaErr( const int n );

  static double DiGamma( const double x );

  static Dpair DiGammaErr( const double x );

  static double DiGammaI( const double y );

  static Dpair DiGammaIErr( const double y );

  static double TriGamma( const int n );

  static Dpair TriGammaErr( const int n );

  static double PolyGammaN( const int n, const double x );

  static Dpair PolyGammaNErr( const int n, const double x ); 

};  // PolyGamma

ZM_END_NAMESPACE( zmsf )        /*  }  // namespace zmsf  */

#endif  /* POLYGAMMA_H */

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