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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_shuffle
//! @{
template<typename eT>
inline
void
op_shuffle::apply_direct(Mat<eT>& out, const Mat<eT>& X, const uword dim)
{
arma_extra_debug_sigprint();
if(X.is_empty()) { out.copy_size(X); return; }
const uword N = (dim == 0) ? X.n_rows : X.n_cols;
// see op_sort_index_bones.hpp for the definition of arma_sort_index_packet
// and the associated comparison functor
typedef arma_sort_index_packet<int> packet;
std::vector<packet> packet_vec(N);
for(uword i=0; i<N; ++i)
{
packet_vec[i].val = int(arma_rng::randi<int>());
packet_vec[i].index = i;
}
arma_sort_index_helper_ascend<int> comparator;
std::sort( packet_vec.begin(), packet_vec.end(), comparator );
const bool is_alias = (&out == &X);
if(X.is_vec() == false)
{
if(is_alias == false)
{
arma_extra_debug_print("op_shuffle::apply(): matrix");
out.copy_size(X);
if(dim == 0)
{
for(uword i=0; i<N; ++i) { out.row(i) = X.row(packet_vec[i].index); }
}
else
{
for(uword i=0; i<N; ++i) { out.col(i) = X.col(packet_vec[i].index); }
}
}
else // in-place shuffle
{
arma_extra_debug_print("op_shuffle::apply(): in-place matrix");
// reuse the val member variable of packet_vec
// to indicate whether a particular row or column
// has already been shuffled
for(uword i=0; i<N; ++i)
{
packet_vec[i].val = 0;
}
if(dim == 0)
{
for(uword i=0; i<N; ++i)
{
if(packet_vec[i].val == 0)
{
const uword j = packet_vec[i].index;
out.swap_rows(i, j);
packet_vec[j].val = 1;
}
}
}
else
{
for(uword i=0; i<N; ++i)
{
if(packet_vec[i].val == 0)
{
const uword j = packet_vec[i].index;
out.swap_cols(i, j);
packet_vec[j].val = 1;
}
}
}
}
}
else // we're dealing with a vector
{
if(is_alias == false)
{
arma_extra_debug_print("op_shuffle::apply(): vector");
out.copy_size(X);
if(dim == 0)
{
if(X.n_rows > 1) // ie. column vector
{
for(uword i=0; i<N; ++i) { out[i] = X[ packet_vec[i].index ]; }
}
else
{
out = X;
}
}
else
{
if(X.n_cols > 1) // ie. row vector
{
for(uword i=0; i<N; ++i) { out[i] = X[ packet_vec[i].index ]; }
}
else
{
out = X;
}
}
}
else // in-place shuffle
{
arma_extra_debug_print("op_shuffle::apply(): in-place vector");
// reuse the val member variable of packet_vec
// to indicate whether a particular row or column
// has already been shuffled
for(uword i=0; i<N; ++i)
{
packet_vec[i].val = 0;
}
if(dim == 0)
{
if(X.n_rows > 1) // ie. column vector
{
for(uword i=0; i<N; ++i)
{
if(packet_vec[i].val == 0)
{
const uword j = packet_vec[i].index;
std::swap(out[i], out[j]);
packet_vec[j].val = 1;
}
}
}
}
else
{
if(X.n_cols > 1) // ie. row vector
{
for(uword i=0; i<N; ++i)
{
if(packet_vec[i].val == 0)
{
const uword j = packet_vec[i].index;
std::swap(out[i], out[j]);
packet_vec[j].val = 1;
}
}
}
}
}
}
}
template<typename T1>
inline
void
op_shuffle::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_shuffle>& in)
{
arma_extra_debug_sigprint();
const unwrap<T1> U(in.m);
const uword dim = in.aux_uword_a;
arma_debug_check( (dim > 1), "shuffle(): parameter 'dim' must be 0 or 1" );
op_shuffle::apply_direct(out, U.M, dim);
}
template<typename T1>
inline
void
op_shuffle_vec::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_shuffle_vec>& in)
{
arma_extra_debug_sigprint();
const unwrap<T1> U(in.m);
const uword dim = (T1::is_xvec) ? uword(U.M.is_rowvec() ? 1 : 0) : uword((T1::is_row) ? 1 : 0);
op_shuffle::apply_direct(out, U.M, dim);
}
//! @}
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