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// SPDX-License-Identifier: Apache-2.0
//
// 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 op_chi2rnd
//! @{
template<typename T1>
inline
void
op_chi2rnd::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_chi2rnd>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const Proxy<T1> P(in.m);
if(P.is_alias(out) == false)
{
op_chi2rnd::apply_noalias(out, P);
}
else
{
Mat<eT> tmp;
op_chi2rnd::apply_noalias(tmp, P);
out.steal_mem(tmp);
}
}
template<typename T1>
inline
void
op_chi2rnd::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& P)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
op_chi2rnd_varying_df<eT> generator;
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
out.set_size(n_rows, n_cols);
eT* out_mem = out.memptr();
if(Proxy<T1>::use_at == false)
{
const uword N = P.get_n_elem();
typename Proxy<T1>::ea_type Pea = P.get_ea();
for(uword i=0; i<N; ++i)
{
out_mem[i] = generator( Pea[i] );
}
}
else
{
for(uword col=0; col < n_cols; ++col)
for(uword row=0; row < n_rows; ++row)
{
(*out_mem) = generator( P.at(row,col) ); ++out_mem;
}
}
}
template<typename eT>
inline
void
op_chi2rnd::fill_constant_df(Mat<eT>& out, const eT df)
{
arma_extra_debug_sigprint();
if(df > eT(0))
{
typedef std::mt19937_64 motor_type;
typedef std::mt19937_64::result_type seed_type;
typedef std::chi_squared_distribution<eT> distr_type;
motor_type motor; motor.seed( seed_type(arma_rng::randi<int>()) );
distr_type distr(df);
const uword N = out.n_elem;
eT* out_mem = out.memptr();
for(uword i=0; i<N; ++i)
{
out_mem[i] = eT( distr(motor) );
}
}
else
{
out.fill( Datum<eT>::nan );
}
}
//
template<typename eT>
inline
op_chi2rnd_varying_df<eT>::~op_chi2rnd_varying_df()
{
arma_extra_debug_sigprint();
}
template<typename eT>
inline
op_chi2rnd_varying_df<eT>::op_chi2rnd_varying_df()
{
arma_extra_debug_sigprint();
typedef std::mt19937_64::result_type seed_type;
motor.seed( seed_type(arma_rng::randi<int>()) );
}
template<typename eT>
inline
eT
op_chi2rnd_varying_df<eT>::operator()(const eT df)
{
arma_extra_debug_sigprint();
// as C++11 doesn't seem to provide a way to explicitly set the parameter
// of an existing chi_squared_distribution object,
// we need to create a new object each time
if(df > eT(0))
{
std::chi_squared_distribution<eT> distr(df);
return eT( distr(motor) );
}
else
{
return Datum<eT>::nan;
}
}
//! @}
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