//                                               -*- C++ -*-
/**
 *  @file  StudentFunctions.hxx
 *  @brief Efficient implementation of the computation of the Student T
 *         CDF and quantile
 *
 *  Copyright (C) 2005-2014 Airbus-EDF-Phimeca
 *
 *  This library is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  @author schueller
 *  @date   2012-07-16 12:24:33 +0200 (Mon, 16 Jul 2012)
 */
#ifndef OPENTURNS_STUDENTFUNCTIONS_HXX
#define OPENTURNS_STUDENTFUNCTIONS_HXX

#include "OTprivate.hxx"
#include "ResourceMap.hxx"

BEGIN_NAMESPACE_OPENTURNS

namespace StudentFunctions
{
  NumericalScalar StudentCDF(const NumericalScalar nu,
			     const NumericalScalar x,
			     const Bool tail = false);

  NumericalScalar StudentQuantile(const NumericalScalar nu,
				  const NumericalScalar p,
				  const Bool tail = false);

  NumericalScalar StudentRealization(const NumericalScalar nu);

  NumericalScalar NonCentralStudentCDF(const NumericalScalar nu,
				       const NumericalScalar delta,
				       const NumericalScalar x,
				       const Bool tail = false);

  NumericalScalar NonCentralStudentCDFAlt0(const NumericalScalar nu,
					   const NumericalScalar delta,
					   const NumericalScalar x,
					   const Bool tail = false,
					   const NumericalScalar precision = ResourceMap::GetAsNumericalScalar("DistFunc-Precision"),
					   const UnsignedLong maximumIteration = ResourceMap::GetAsNumericalScalar("DistFunc-MaximumIteration"));

  NumericalScalar NonCentralStudentCDFAlt1(const NumericalScalar nu,
					   const NumericalScalar delta,
					   const NumericalScalar x,
					   const Bool tail = false,
					   const NumericalScalar precision = ResourceMap::GetAsNumericalScalar("DistFunc-Precision"));

  NumericalScalar NonCentralStudentPDF(const NumericalScalar nu,
				       const NumericalScalar delta,
				       const NumericalScalar x);

  NumericalScalar NonCentralStudentPDFAlt0(const NumericalScalar nu,
					   const NumericalScalar delta,
					   const NumericalScalar x,
					   const NumericalScalar precision = ResourceMap::GetAsNumericalScalar("DistFunc-Precision"),
					   const UnsignedLong maximumIteration = ResourceMap::GetAsNumericalScalar("DistFunc-MaximumIteration"));

  NumericalScalar NonCentralStudentRealization(const NumericalScalar nu,
					       const NumericalScalar delta);
} // StudentFunctions

END_NAMESPACE_OPENTURNS

#endif /* OPENTURNS_STUDENTFUNCTIONS_HXX */
