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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 glue_toeplitz
//! @{
template<typename T1, typename T2>
inline
void
glue_toeplitz::apply(Mat<typename T1::elem_type>& out, const Glue<T1, T2, glue_toeplitz>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const unwrap_check<T1> tmp1(in.A, out);
const unwrap_check<T2> tmp2(in.B, out);
const Mat<eT>& A = tmp1.M;
const Mat<eT>& B = tmp2.M;
arma_debug_check
(
( ((A.is_vec() == false) && (A.is_empty() == false)) || ((B.is_vec() == false) && (B.is_empty() == false)) ),
"toeplitz(): given object must be a vector"
);
const uword A_N = A.n_elem;
const uword B_N = B.n_elem;
const eT* A_mem = A.memptr();
const eT* B_mem = B.memptr();
out.set_size(A_N, B_N);
if( out.is_empty() ) { return; }
for(uword col=0; col < B_N; ++col)
{
eT* col_mem = out.colptr(col);
uword i = 0;
for(uword row=col; row < A_N; ++row, ++i) { col_mem[row] = A_mem[i]; }
}
for(uword row=0; row < A_N; ++row)
{
uword i = 1;
for(uword col=(row+1); col < B_N; ++col, ++i) { out.at(row,col) = B_mem[i]; }
}
}
//! @}
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