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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 spop_reverse
//! @{
template<typename eT>
inline
void
spop_reverse::apply_spmat(SpMat<eT>& out, const SpMat<eT>& X, const uword dim)
{
arma_extra_debug_sigprint();
const uword X_n_rows = X.n_rows;
const uword X_n_cols = X.n_cols;
const uword X_n_rows_m1 = X_n_rows - 1;
const uword X_n_cols_m1 = X_n_cols - 1;
const uword N = X.n_nonzero;
if(N == uword(0))
{
out.zeros(X_n_rows, X_n_cols);
return;
}
umat locs(2, N, arma_nozeros_indicator());
uword* locs_mem = locs.memptr();
typename SpMat<eT>::const_iterator it = X.begin();
if(dim == 0)
{
for(uword i=0; i < N; ++i)
{
const uword row = it.row();
const uword col = it.col();
(*locs_mem) = X_n_rows_m1 - row; locs_mem++;
(*locs_mem) = col; locs_mem++;
++it;
}
}
else
if(dim == 1)
{
for(uword i=0; i < N; ++i)
{
const uword row = it.row();
const uword col = it.col();
(*locs_mem) = row; locs_mem++;
(*locs_mem) = X_n_cols_m1 - col; locs_mem++;
++it;
}
}
const Col<eT> vals(const_cast<eT*>(X.values), N, false);
SpMat<eT> tmp(locs, vals, X_n_rows, X_n_cols, true, false);
out.steal_mem(tmp);
}
template<typename T1>
inline
void
spop_reverse::apply_proxy(SpMat<typename T1::elem_type>& out, const T1& X, const uword dim)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const SpProxy<T1> P(X);
const uword P_n_rows = P.get_n_rows();
const uword P_n_cols = P.get_n_cols();
const uword P_n_rows_m1 = P_n_rows - 1;
const uword P_n_cols_m1 = P_n_cols - 1;
const uword N = P.get_n_nonzero();
if(N == uword(0))
{
out.zeros(P_n_rows, P_n_cols);
return;
}
umat locs(2, N, arma_nozeros_indicator());
Col<eT> vals( N, arma_nozeros_indicator());
uword* locs_mem = locs.memptr();
eT* vals_mem = vals.memptr();
typename SpProxy<T1>::const_iterator_type it = P.begin();
if(dim == 0)
{
for(uword i=0; i < N; ++i)
{
const uword row = it.row();
const uword col = it.col();
(*locs_mem) = P_n_rows_m1 - row; locs_mem++;
(*locs_mem) = col; locs_mem++;
(*vals_mem) = (*it); vals_mem++;
++it;
}
}
else
if(dim == 1)
{
for(uword i=0; i < N; ++i)
{
const uword row = it.row();
const uword col = it.col();
(*locs_mem) = row; locs_mem++;
(*locs_mem) = P_n_cols_m1 - col; locs_mem++;
(*vals_mem) = (*it); vals_mem++;
++it;
}
}
SpMat<eT> tmp(locs, vals, P_n_rows, P_n_cols, true, false);
out.steal_mem(tmp);
}
template<typename T1>
inline
void
spop_reverse::apply(SpMat<typename T1::elem_type>& out, const SpOp<T1,spop_reverse>& in)
{
arma_extra_debug_sigprint();
const uword dim = in.aux_uword_a;
arma_debug_check( (dim > 1), "reverse(): parameter 'dim' must be 0 or 1" );
if(is_SpMat<T1>::value)
{
const unwrap_spmat<T1> tmp(in.m);
spop_reverse::apply_spmat(out, tmp.M, dim);
}
else
{
spop_reverse::apply_proxy(out, in.m, dim);
}
}
//! @}
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