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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_nonzeros
//! @{
template<typename T1>
inline
void
op_nonzeros::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& P)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword N_max = P.get_n_elem();
Mat<eT> tmp(N_max, 1, arma_nozeros_indicator());
eT* tmp_mem = tmp.memptr();
uword N_nz = 0;
if(Proxy<T1>::use_at == false)
{
typename Proxy<T1>::ea_type Pea = P.get_ea();
for(uword i=0; i<N_max; ++i)
{
const eT val = Pea[i];
if(val != eT(0)) { tmp_mem[N_nz] = val; ++N_nz; }
}
}
else
{
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
for(uword col=0; col < n_cols; ++col)
for(uword row=0; row < n_rows; ++row)
{
const eT val = P.at(row,col);
if(val != eT(0)) { tmp_mem[N_nz] = val; ++N_nz; }
}
}
out.steal_mem_col(tmp, N_nz);
}
template<typename T1>
inline
void
op_nonzeros::apply(Mat<typename T1::elem_type>& out, const Op<T1, op_nonzeros>& X)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const Proxy<T1> P(X.m);
if(P.get_n_elem() == 0) { out.set_size(0,1); return; }
if(P.is_alias(out))
{
Mat<eT> out2;
op_nonzeros::apply_noalias(out2, P);
out.steal_mem(out2);
}
else
{
op_nonzeros::apply_noalias(out, P);
}
}
template<typename T1>
inline
void
op_nonzeros_spmat::apply(Mat<typename T1::elem_type>& out, const SpToDOp<T1, op_nonzeros_spmat>& X)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const SpProxy<T1> P(X.m);
const uword N = P.get_n_nonzero();
out.set_size(N,1);
if(N == 0) { return; }
if(is_SpMat<typename SpProxy<T1>::stored_type>::value)
{
const unwrap_spmat<typename SpProxy<T1>::stored_type> U(P.Q);
arrayops::copy(out.memptr(), U.M.values, N);
return;
}
if(is_SpSubview<typename SpProxy<T1>::stored_type>::value)
{
const SpSubview<eT>& sv = reinterpret_cast< const SpSubview<eT>& >(P.Q);
if(sv.n_rows == sv.m.n_rows)
{
const SpMat<eT>& m = sv.m;
const uword col = sv.aux_col1;
arrayops::copy(out.memptr(), &(m.values[ m.col_ptrs[col] ]), N);
return;
}
}
eT* out_mem = out.memptr();
typename SpProxy<T1>::const_iterator_type it = P.begin();
for(uword i=0; i<N; ++i) { out_mem[i] = (*it); ++it; }
}
//! @}
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