ScalarInverseTangent.h

//-*-C++-*-
/***************************************************************************
 *
 *   Copyright (C) 2004 by Willem van Straten
 *   Licensed under the Academic Free License version 2.1
 *
 ***************************************************************************/
 
// psrchive/More/MEAL/MEAL/ScalarInverseTangent.h
 
#ifndef __MEAL_ScalarInverseTangent_H
#define __MEAL_ScalarInverseTangent_H
 
#include "MEAL/UnaryScalar.h"
 
namespace MEAL {

  class ScalarInverseTangent : public UnaryScalar
  {
 
  public:
 
    // ///////////////////////////////////////////////////////////////////
    //
    // UnaryScalar implementation
    //
    // ///////////////////////////////////////////////////////////////////

    double function (double x) const;

    double dfdx (double x) const;
 
    // ///////////////////////////////////////////////////////////////////
    //
    // Function implementation
    //
    // ///////////////////////////////////////////////////////////////////

    std::string get_name () const;
 
  };
 
 
}
 
// returns atan(x*pi/2)/(x*pi/2)
double atanc (double x, double* derivative = 0, double* datancc = 0);
 
#endif