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// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------
//! \addtogroup fn_normcdf
//! @{
template<typename T1, typename T2, typename T3>
inline
typename enable_if2< (is_real<typename T1::elem_type>::value), void >::result
normcdf_helper(Mat<typename T1::elem_type>& out, const Base<typename T1::elem_type, T1>& X_expr, const Base<typename T1::elem_type, T2>& M_expr, const Base<typename T1::elem_type, T3>& S_expr)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
if(Proxy<T1>::use_at || Proxy<T2>::use_at || Proxy<T3>::use_at)
{
const quasi_unwrap<T1> UX(X_expr.get_ref());
const quasi_unwrap<T2> UM(M_expr.get_ref());
const quasi_unwrap<T3> US(S_expr.get_ref());
normcdf_helper(out, UX.M, UM.M, US.M);
return;
}
const Proxy<T1> PX(X_expr.get_ref());
const Proxy<T2> PM(M_expr.get_ref());
const Proxy<T3> PS(S_expr.get_ref());
arma_debug_check( ( (PX.get_n_rows() != PM.get_n_rows()) || (PX.get_n_cols() != PM.get_n_cols()) || (PM.get_n_rows() != PS.get_n_rows()) || (PM.get_n_cols() != PS.get_n_cols()) ), "normcdf(): size mismatch" );
out.set_size(PX.get_n_rows(), PX.get_n_cols());
eT* out_mem = out.memptr();
const uword N = PX.get_n_elem();
typename Proxy<T1>::ea_type X_ea = PX.get_ea();
typename Proxy<T2>::ea_type M_ea = PM.get_ea();
typename Proxy<T3>::ea_type S_ea = PS.get_ea();
const bool use_mp = arma_config::openmp && mp_gate<eT,true>::eval(N);
if(use_mp)
{
#if defined(ARMA_USE_OPENMP)
{
const int n_threads = mp_thread_limit::get();
#pragma omp parallel for schedule(static) num_threads(n_threads)
for(uword i=0; i<N; ++i)
{
const eT tmp = (X_ea[i] - M_ea[i]) / (S_ea[i] * (-Datum<eT>::sqrt2));
out_mem[i] = eT(0.5) * std::erfc(tmp);
}
}
#endif
}
else
{
for(uword i=0; i<N; ++i)
{
const eT tmp = (X_ea[i] - M_ea[i]) / (S_ea[i] * (-Datum<eT>::sqrt2));
out_mem[i] = eT(0.5) * std::erfc(tmp);
}
}
}
template<typename eT>
inline
arma_warn_unused
typename enable_if2< (is_real<eT>::value), eT >::result
normcdf(const eT x)
{
const eT out = eT(0.5) * std::erfc( x / (-Datum<eT>::sqrt2) );
return out;
}
template<typename eT>
inline
arma_warn_unused
typename enable_if2< (is_real<eT>::value), eT >::result
normcdf(const eT x, const eT mu, const eT sigma)
{
const eT tmp = (x - mu) / (sigma * (-Datum<eT>::sqrt2));
const eT out = eT(0.5) * std::erfc(tmp);
return out;
}
template<typename eT, typename T2, typename T3>
inline
arma_warn_unused
typename enable_if2< (is_real<eT>::value), Mat<eT> >::result
normcdf(const eT x, const Base<eT, T2>& M_expr, const Base<eT, T3>& S_expr)
{
arma_extra_debug_sigprint();
const quasi_unwrap<T2> UM(M_expr.get_ref());
const Mat<eT>& M = UM.M;
Mat<eT> out;
normcdf_helper(out, x*ones< Mat<eT> >(arma::size(M)), M, S_expr.get_ref());
return out;
}
template<typename T1>
inline
arma_warn_unused
typename enable_if2< (is_real<typename T1::elem_type>::value), Mat<typename T1::elem_type> >::result
normcdf(const Base<typename T1::elem_type, T1>& X_expr)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const quasi_unwrap<T1> UX(X_expr.get_ref());
const Mat<eT>& X = UX.M;
Mat<eT> out;
normcdf_helper(out, X, zeros< Mat<eT> >(arma::size(X)), ones< Mat<eT> >(arma::size(X)));
return out;
}
template<typename T1>
inline
arma_warn_unused
typename enable_if2< (is_real<typename T1::elem_type>::value), Mat<typename T1::elem_type> >::result
normcdf(const Base<typename T1::elem_type, T1>& X_expr, const typename T1::elem_type mu, const typename T1::elem_type sigma)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const quasi_unwrap<T1> UX(X_expr.get_ref());
const Mat<eT>& X = UX.M;
Mat<eT> out;
normcdf_helper(out, X, mu*ones< Mat<eT> >(arma::size(X)), sigma*ones< Mat<eT> >(arma::size(X)));
return out;
}
template<typename T1, typename T2, typename T3>
inline
arma_warn_unused
typename enable_if2< (is_real<typename T1::elem_type>::value), Mat<typename T1::elem_type> >::result
normcdf(const Base<typename T1::elem_type, T1>& X_expr, const Base<typename T1::elem_type, T2>& M_expr, const Base<typename T1::elem_type, T3>& S_expr)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
Mat<eT> out;
normcdf_helper(out, X_expr.get_ref(), M_expr.get_ref(), S_expr.get_ref());
return out;
}
//! @}
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