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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 glue_atan2
//! @{
template<typename T1, typename T2>
inline
void
glue_atan2::apply(Mat<typename T1::elem_type>& out, const Glue<T1, T2, glue_atan2>& expr)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const Proxy<T1> P1(expr.A);
const Proxy<T2> P2(expr.B);
arma_assert_same_size(P1, P2, "atan2()");
const bool bad_alias = ( (Proxy<T1>::has_subview && P1.is_alias(out)) || (Proxy<T2>::has_subview && P2.is_alias(out)) );
if(bad_alias == false)
{
glue_atan2::apply_noalias(out, P1, P2);
}
else
{
Mat<eT> tmp;
glue_atan2::apply_noalias(tmp, P1, P2);
out.steal_mem(tmp);
}
}
template<typename T1, typename T2>
inline
void
glue_atan2::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& P1, const Proxy<T2>& P2)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword n_rows = P1.get_n_rows();
const uword n_cols = P1.get_n_cols();
const uword n_elem = P1.get_n_elem();
out.set_size(n_rows, n_cols);
eT* out_mem = out.memptr();
const bool use_mp = arma_config::openmp && mp_gate<eT, (Proxy<T1>::use_mp || Proxy<T2>::use_mp)>::eval(n_elem);
const bool use_at = Proxy<T1>::use_at || Proxy<T2>::use_at;
if(use_at == false)
{
typename Proxy<T1>::ea_type eaP1 = P1.get_ea();
typename Proxy<T2>::ea_type eaP2 = P2.get_ea();
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_elem; ++i)
{
out_mem[i] = std::atan2( eaP1[i], eaP2[i] );
}
}
#endif
}
else
{
for(uword i=0; i<n_elem; ++i)
{
out_mem[i] = std::atan2( eaP1[i], eaP2[i] );
}
}
}
else
{
if(use_mp)
{
const unwrap<typename Proxy<T1>::stored_type> U1(P1.Q);
const unwrap<typename Proxy<T2>::stored_type> U2(P2.Q);
out = arma::atan2(U1.M, U2.M);
}
else
{
for(uword col=0; col < n_cols; ++col)
for(uword row=0; row < n_rows; ++row)
{
*out_mem = std::atan2( P1.at(row,col), P2.at(row,col) );
out_mem++;
}
}
}
}
template<typename T1, typename T2>
inline
void
glue_atan2::apply(Cube<typename T1::elem_type>& out, const GlueCube<T1, T2, glue_atan2>& expr)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const ProxyCube<T1> P1(expr.A);
const ProxyCube<T2> P2(expr.B);
arma_assert_same_size(P1, P2, "atan2()");
const bool bad_alias = ( (ProxyCube<T1>::has_subview && P1.is_alias(out)) || (ProxyCube<T2>::has_subview && P2.is_alias(out)) );
if(bad_alias == false)
{
glue_atan2::apply_noalias(out, P1, P2);
}
else
{
Cube<eT> tmp;
glue_atan2::apply_noalias(tmp, P1, P2);
out.steal_mem(tmp);
}
}
template<typename T1, typename T2>
inline
void
glue_atan2::apply_noalias(Cube<typename T1::elem_type>& out, const ProxyCube<T1>& P1, const ProxyCube<T2>& P2)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword n_rows = P1.get_n_rows();
const uword n_cols = P1.get_n_cols();
const uword n_slices = P1.get_n_slices();
const uword n_elem = P1.get_n_elem();
out.set_size(n_rows, n_cols, n_slices);
eT* out_mem = out.memptr();
const bool use_mp = arma_config::openmp && mp_gate<eT, (ProxyCube<T1>::use_mp || ProxyCube<T2>::use_mp)>::eval(n_elem);
const bool use_at = ProxyCube<T1>::use_at || ProxyCube<T2>::use_at;
if(use_at == false)
{
typename ProxyCube<T1>::ea_type eaP1 = P1.get_ea();
typename ProxyCube<T2>::ea_type eaP2 = P2.get_ea();
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_elem; ++i)
{
out_mem[i] = std::atan2( eaP1[i], eaP2[i] );
}
}
#endif
}
else
{
for(uword i=0; i<n_elem; ++i)
{
out_mem[i] = std::atan2( eaP1[i], eaP2[i] );
}
}
}
else
{
if(use_mp)
{
const unwrap_cube<typename ProxyCube<T1>::stored_type> U1(P1.Q);
const unwrap_cube<typename ProxyCube<T2>::stored_type> U2(P2.Q);
out = arma::atan2(U1.M, U2.M);
}
else
{
for(uword slice=0; slice < n_slices; ++slice)
for(uword col=0; col < n_cols; ++col )
for(uword row=0; row < n_rows; ++row )
{
*out_mem = std::atan2( P1.at(row,col,slice), P2.at(row,col,slice) );
out_mem++;
}
}
}
}
//! @}
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