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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 fn_diags_spdiags
//! @{
template<typename T1, typename T2>
inline
Mat<typename T1::elem_type>
diags(const Base<typename T1::elem_type, T1>& V_expr, const Base<sword,T2>& D_expr, const uword n_rows, const uword n_cols)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const quasi_unwrap<T1> UV(V_expr.get_ref());
const Mat<eT>& V = UV.M;
const quasi_unwrap<T2> UD(D_expr.get_ref());
const Mat<sword>& D = UD.M;
arma_debug_check( ((D.is_vec() == false) && (D.is_empty() == false)), "D must be a vector" );
arma_debug_check( (V.n_cols != D.n_elem), "number of colums in matrix V must match the length of vector D" );
Mat<eT> out(n_rows, n_cols, fill::zeros);
for(uword i=0; i < D.n_elem; ++i)
{
const sword diag_id = D[i];
const uword row_offset = (diag_id < 0) ? uword(-diag_id) : 0;
const uword col_offset = (diag_id > 0) ? uword( diag_id) : 0;
arma_debug_check_bounds
(
((row_offset > 0) && (row_offset >= n_rows)) || ((col_offset > 0) && (col_offset >= n_cols)),
"diags(): requested diagonal out of bounds"
);
const uword diag_len = (std::min)(n_rows - row_offset, n_cols - col_offset);
const uword V_start = (diag_id < 0) ? uword(0) : uword(diag_id);
const eT* V_colmem = V.colptr(i);
for(uword j=0; j < diag_len; ++j)
{
const uword V_index = V_start + j;
if(V_index >= V.n_rows) { break; }
out.at(j + row_offset, j + col_offset) = V_colmem[V_index];
}
}
return out;
}
template<typename T1, typename T2>
inline
SpMat<typename T1::elem_type>
spdiags(const Base<typename T1::elem_type, T1>& V_expr, const Base<sword,T2>& D_expr, const uword n_rows, const uword n_cols)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const quasi_unwrap<T1> UV(V_expr.get_ref());
const Mat<eT>& V = UV.M;
const quasi_unwrap<T2> UD(D_expr.get_ref());
const Mat<sword>& D = UD.M;
arma_debug_check( ((D.is_vec() == false) && (D.is_empty() == false)), "D must be a vector" );
arma_debug_check( (V.n_cols != D.n_elem), "number of colums in matrix V must match the length of vector D" );
MapMat<eT> tmp(n_rows, n_cols);
for(uword i=0; i < D.n_elem; ++i)
{
const sword diag_id = D[i];
const uword row_offset = (diag_id < 0) ? uword(-diag_id) : 0;
const uword col_offset = (diag_id > 0) ? uword( diag_id) : 0;
arma_debug_check_bounds
(
((row_offset > 0) && (row_offset >= n_rows)) || ((col_offset > 0) && (col_offset >= n_cols)),
"diags(): requested diagonal out of bounds"
);
const uword diag_len = (std::min)(n_rows - row_offset, n_cols - col_offset);
const uword V_start = (diag_id < 0) ? uword(0) : uword(diag_id);
const eT* V_colmem = V.colptr(i);
for(uword j=0; j < diag_len; ++j)
{
const uword V_index = V_start + j;
if(V_index >= V.n_rows) { break; }
tmp.at(j + row_offset, j + col_offset) = V_colmem[V_index];
}
}
return SpMat<eT>(tmp);
}
//! @}
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