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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_find_unique
//! @{
template<typename T1>
inline
bool
op_find_unique::apply_helper(Mat<uword>& out, const Proxy<T1>& P, const bool ascending_indices)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword n_elem = P.get_n_elem();
if(n_elem == 0) { out.set_size(0,1); return true; }
if(n_elem == 1) { out.set_size(1,1); out[0] = 0; return true; }
uvec indices(n_elem, arma_nozeros_indicator());
std::vector< arma_find_unique_packet<eT> > packet_vec(n_elem);
if(Proxy<T1>::use_at == false)
{
typename Proxy<T1>::ea_type Pea = P.get_ea();
for(uword i=0; i<n_elem; ++i)
{
const eT val = Pea[i];
if(arma_isnan(val)) { return false; }
packet_vec[i].val = val;
packet_vec[i].index = i;
}
}
else
{
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
uword i = 0;
for(uword col=0; col < n_cols; ++col)
for(uword row=0; row < n_rows; ++row)
{
const eT val = P.at(row,col);
if(arma_isnan(val)) { return false; }
packet_vec[i].val = val;
packet_vec[i].index = i;
++i;
}
}
arma_find_unique_comparator<eT> comparator;
std::sort( packet_vec.begin(), packet_vec.end(), comparator );
uword* indices_mem = indices.memptr();
indices_mem[0] = packet_vec[0].index;
uword count = 1;
for(uword i=1; i < n_elem; ++i)
{
const eT diff = packet_vec[i-1].val - packet_vec[i].val;
if(diff != eT(0))
{
indices_mem[count] = packet_vec[i].index;
++count;
}
}
out.steal_mem_col(indices,count);
if(ascending_indices) { std::sort(out.begin(), out.end()); }
return true;
}
template<typename T1>
inline
void
op_find_unique::apply(Mat<uword>& out, const mtOp<uword,T1,op_find_unique>& in)
{
arma_extra_debug_sigprint();
const Proxy<T1> P(in.m);
const bool ascending_indices = (in.aux_uword_a == uword(1));
const bool all_non_nan = op_find_unique::apply_helper(out, P, ascending_indices);
if(all_non_nan == false)
{
arma_debug_check( true, "find_unique(): detected NaN" );
out.reset();
}
}
//! @}
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