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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_toeplitz
//! @{
template<typename T1>
inline
void
op_toeplitz::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_toeplitz>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const unwrap_check<T1> tmp(in.m, out);
const Mat<eT>& X = tmp.M;
arma_debug_check( ((X.is_vec() == false) && (X.is_empty() == false)), "toeplitz(): given object must be a vector" );
const uword N = X.n_elem;
const eT* X_mem = X.memptr();
out.set_size(N,N);
for(uword col=0; col < N; ++col)
{
eT* col_mem = out.colptr(col);
uword i;
i = col;
for(uword row=0; row < col; ++row, --i) { col_mem[row] = X_mem[i]; }
i = 0;
for(uword row=col; row < N; ++row, ++i) { col_mem[row] = X_mem[i]; }
}
}
template<typename T1>
inline
void
op_toeplitz_c::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_toeplitz_c>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const unwrap_check<T1> tmp(in.m, out);
const Mat<eT>& X = tmp.M;
arma_debug_check( ((X.is_vec() == false) && (X.is_empty() == false)), "circ_toeplitz(): given object must be a vector" );
const uword N = X.n_elem;
const eT* X_mem = X.memptr();
out.set_size(N,N);
if(X.is_rowvec())
{
for(uword row=0; row < N; ++row)
{
uword i;
i = row;
for(uword col=0; col < row; ++col, --i) { out.at(row,col) = X_mem[N-i]; }
i = 0;
for(uword col=row; col < N; ++col, ++i) { out.at(row,col) = X_mem[i]; }
}
}
else
{
for(uword col=0; col < N; ++col)
{
eT* col_mem = out.colptr(col);
uword i;
i = col;
for(uword row=0; row < col; ++row, --i) { col_mem[row] = X_mem[N-i]; }
i = 0;
for(uword row=col; row < N; ++row, ++i) { col_mem[row] = X_mem[i]; }
}
}
}
//! @}
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