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/* Copyright (c) 2008-2022 the MRtrix3 contributors.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Covered Software is provided under this License on an "as is"
* basis, without warranty of any kind, either expressed, implied, or
* statutory, including, without limitation, warranties that the
* Covered Software is free of defects, merchantable, fit for a
* particular purpose or non-infringing.
* See the Mozilla Public License v. 2.0 for more details.
*
* For more details, see http://www.mrtrix.org/.
*/
#ifndef __math_betainc_h__
#define __math_betainc_h__
#ifdef MRTRIX_HAVE_EIGEN_UNSUPPORTED_SPECIAL_FUNCTIONS
#include <unsupported/Eigen/SpecialFunctions>
#endif
#include <math.h>
#include "types.h"
namespace MR
{
namespace Math
{
#ifdef MRTRIX_HAVE_EIGEN_UNSUPPORTED_SPECIAL_FUNCTIONS
// Compute the *regularised* incomplete beta function using
// the incomplete beta function as provided in Eigen 3.3 and above
template <typename ArgADerived, typename ArgBDerived, typename ArgXDerived>
inline const Eigen::Array<typename ArgXDerived::Scalar, Eigen::Dynamic, Eigen::Dynamic>
betaincreg (const Eigen::ArrayBase<ArgADerived>& a, const Eigen::ArrayBase<ArgBDerived>& b, const Eigen::ArrayBase<ArgXDerived>& x)
{
Eigen::Array<typename ArgXDerived::Scalar, Eigen::Dynamic, Eigen::Dynamic> ones (x);
ones.fill (typename ArgXDerived::Scalar (1));
return (Eigen::betainc (a, b, x) / Eigen::betainc (a, b, ones)).eval();
};
#endif
default_type betaincreg (const default_type a, const default_type b, const default_type x);
}
}
#endif
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