//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidAlgorithms/ApodizationFunctions.h"
#include <cmath>

namespace Mantid {
namespace Algorithms {
namespace ApodizationFunctions {

/**
* Returns the evaluation of the Lorentz
* (an exponential decay)
* apodization function at a time (t) and
* decay constant tau:
* f = exp(-t/tau)
* @param time :: [input] current time (t)
* @param decayConstant :: [input] the decay constant (tau)
* @returns :: Function evaluation
*/
double lorentz(const double time, const double decayConstant) {
  return exp(-time / decayConstant);
}
/**
* Returns the evaluation of the Gaussian
* apodization function at a time (t) and
* decay constant tau:
* f =exp(-time^2/(2*tau^2))
* @param time :: [input] current time (t)
* @param decayConstant :: [input] the decay constant (tau)
* @returns :: Function evaluation
*/
double gaussian(const double time, const double decayConstant) {
  return exp(-(time * time) / (2. * decayConstant * decayConstant));
}

/**
* Returns no
* apodization function. i.e. the data is unchanged
* @param :: [input] current time (t)
* @param :: [input] the decay constant (tau)
* @returns :: Function evaluation
*/
double none(const double, const double) { return 1.; }
}
}
}