175 lines
3.4 KiB
C++
175 lines
3.4 KiB
C++
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
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// Copyright 2008-2016 National ICT Australia (NICTA)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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//! \addtogroup op_chi2rnd
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//! @{
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template<typename T1>
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inline
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void
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op_chi2rnd::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_chi2rnd>& in)
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{
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arma_extra_debug_sigprint();
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typedef typename T1::elem_type eT;
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const Proxy<T1> P(in.m);
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if(P.is_alias(out) == false)
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{
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op_chi2rnd::apply_noalias(out, P);
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}
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else
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{
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Mat<eT> tmp;
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op_chi2rnd::apply_noalias(tmp, P);
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out.steal_mem(tmp);
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}
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}
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template<typename T1>
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inline
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void
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op_chi2rnd::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& P)
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{
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arma_extra_debug_sigprint();
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typedef typename T1::elem_type eT;
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op_chi2rnd_varying_df<eT> generator;
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const uword n_rows = P.get_n_rows();
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const uword n_cols = P.get_n_cols();
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out.set_size(n_rows, n_cols);
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eT* out_mem = out.memptr();
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if(Proxy<T1>::use_at == false)
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{
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const uword N = P.get_n_elem();
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typename Proxy<T1>::ea_type Pea = P.get_ea();
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for(uword i=0; i<N; ++i)
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{
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out_mem[i] = generator( Pea[i] );
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}
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}
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else
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{
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for(uword col=0; col < n_cols; ++col)
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for(uword row=0; row < n_rows; ++row)
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{
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(*out_mem) = generator( P.at(row,col) ); ++out_mem;
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}
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}
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}
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template<typename eT>
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inline
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void
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op_chi2rnd::fill_constant_df(Mat<eT>& out, const eT df)
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{
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arma_extra_debug_sigprint();
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if(df > eT(0))
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{
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typedef std::mt19937_64 motor_type;
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typedef std::mt19937_64::result_type seed_type;
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typedef std::chi_squared_distribution<eT> distr_type;
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motor_type motor; motor.seed( seed_type(arma_rng::randi<int>()) );
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distr_type distr(df);
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const uword N = out.n_elem;
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eT* out_mem = out.memptr();
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for(uword i=0; i<N; ++i)
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{
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out_mem[i] = eT( distr(motor) );
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}
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}
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else
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{
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out.fill( Datum<eT>::nan );
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}
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}
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//
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template<typename eT>
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inline
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op_chi2rnd_varying_df<eT>::~op_chi2rnd_varying_df()
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{
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arma_extra_debug_sigprint();
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}
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template<typename eT>
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inline
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op_chi2rnd_varying_df<eT>::op_chi2rnd_varying_df()
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{
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arma_extra_debug_sigprint();
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typedef std::mt19937_64::result_type seed_type;
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motor.seed( seed_type(arma_rng::randi<int>()) );
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}
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template<typename eT>
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inline
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eT
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op_chi2rnd_varying_df<eT>::operator()(const eT df)
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{
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arma_extra_debug_sigprint();
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// as C++11 doesn't seem to provide a way to explicitly set the parameter
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// of an existing chi_squared_distribution object,
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// we need to create a new object each time
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if(df > eT(0))
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{
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std::chi_squared_distribution<eT> distr(df);
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return eT( distr(motor) );
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}
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else
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{
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return Datum<eT>::nan;
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}
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}
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//! @}
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