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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_unique
//! @{
template<typename T1>
inline
bool
op_unique::apply_helper(Mat<typename T1::elem_type>& out, const Proxy<T1>& P, const bool P_is_row)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword n_elem = P.get_n_elem();
if(n_elem == 0)
{
if(P_is_row)
{
out.set_size(1,0);
}
else
{
out.set_size(0,1);
}
return true;
}
if(n_elem == 1)
{
const eT tmp = (Proxy<T1>::use_at) ? P.at(0,0) : P[0];
out.set_size(1, 1);
out[0] = tmp;
return true;
}
Mat<eT> X(n_elem, 1, arma_nozeros_indicator());
eT* X_mem = X.memptr();
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)) { out.soft_reset(); return false; }
X_mem[i] = val;
}
}
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(arma_isnan(val)) { out.soft_reset(); return false; }
(*X_mem) = val; X_mem++;
}
X_mem = X.memptr();
}
arma_unique_comparator<eT> comparator;
std::sort( X.begin(), X.end(), comparator );
uword N_unique = 1;
for(uword i=1; i < n_elem; ++i)
{
const eT a = X_mem[i-1];
const eT b = X_mem[i ];
const eT diff = a - b;
if(diff != eT(0)) { ++N_unique; }
}
if(P_is_row)
{
out.set_size(1, N_unique);
}
else
{
out.set_size(N_unique, 1);
}
eT* out_mem = out.memptr();
if(n_elem > 0) { (*out_mem) = X_mem[0]; out_mem++; }
for(uword i=1; i < n_elem; ++i)
{
const eT a = X_mem[i-1];
const eT b = X_mem[i ];
const eT diff = a - b;
if(diff != eT(0)) { (*out_mem) = b; out_mem++; }
}
return true;
}
template<typename T1>
inline
void
op_unique::apply(Mat<typename T1::elem_type>& out, const Op<T1, op_unique>& in)
{
arma_extra_debug_sigprint();
const Proxy<T1> P(in.m);
const bool all_non_nan = op_unique::apply_helper(out, P, false);
arma_debug_check( (all_non_nan == false), "unique(): detected NaN" );
}
template<typename T1>
inline
void
op_unique_vec::apply(Mat<typename T1::elem_type>& out, const Op<T1, op_unique_vec>& in)
{
arma_extra_debug_sigprint();
const Proxy<T1> P(in.m);
const bool P_is_row = (T1::is_xvec) ? bool(P.get_n_rows() == 1) : bool(T1::is_row);
const bool all_non_nan = op_unique::apply_helper(out, P, P_is_row);
arma_debug_check( (all_non_nan == false), "unique(): detected NaN" );
}
//! @}
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