140 lines
3.5 KiB
C++
140 lines
3.5 KiB
C++
// 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_trimat_ind
|
|
//! @{
|
|
|
|
|
|
arma_warn_unused
|
|
inline
|
|
uvec
|
|
trimatu_ind(const SizeMat& s, const sword k = 0)
|
|
{
|
|
arma_debug_sigprint();
|
|
|
|
const uword n_rows = s.n_rows;
|
|
const uword n_cols = s.n_cols;
|
|
|
|
const uword row_offset = (k < 0) ? uword(-k) : uword(0);
|
|
const uword col_offset = (k > 0) ? uword( k) : uword(0);
|
|
|
|
arma_conform_check_bounds( ((row_offset > 0) && (row_offset >= n_rows)) || ((col_offset > 0) && (col_offset >= n_cols)), "trimatu_ind(): requested diagonal is out of bounds" );
|
|
|
|
const uword N = (std::min)(n_rows - row_offset, n_cols - col_offset);
|
|
|
|
uvec tmp(n_rows * n_cols, arma_nozeros_indicator()); // worst case scenario
|
|
uword* tmp_mem = tmp.memptr();
|
|
uword count = 0;
|
|
|
|
for(uword i=0; i < n_cols; ++i)
|
|
{
|
|
const uword col = i + col_offset;
|
|
|
|
if(i < N)
|
|
{
|
|
const uword end_row = i + row_offset;
|
|
|
|
const uword index_offset = (n_rows * col);
|
|
|
|
for(uword row=0; row <= end_row; ++row)
|
|
{
|
|
tmp_mem[count] = index_offset + row;
|
|
++count;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if(col < n_cols)
|
|
{
|
|
const uword index_offset = (n_rows * col);
|
|
|
|
for(uword row=0; row < n_rows; ++row)
|
|
{
|
|
tmp_mem[count] = index_offset + row;
|
|
++count;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
uvec out;
|
|
|
|
out.steal_mem_col(tmp, count);
|
|
|
|
return out;
|
|
}
|
|
|
|
|
|
|
|
arma_warn_unused
|
|
inline
|
|
uvec
|
|
trimatl_ind(const SizeMat& s, const sword k = 0)
|
|
{
|
|
arma_debug_sigprint();
|
|
|
|
const uword n_rows = s.n_rows;
|
|
const uword n_cols = s.n_cols;
|
|
|
|
const uword row_offset = (k < 0) ? uword(-k) : uword(0);
|
|
const uword col_offset = (k > 0) ? uword( k) : uword(0);
|
|
|
|
arma_conform_check_bounds( ((row_offset > 0) && (row_offset >= n_rows)) || ((col_offset > 0) && (col_offset >= n_cols)), "trimatl_ind(): requested diagonal is out of bounds" );
|
|
|
|
const uword N = (std::min)(n_rows - row_offset, n_cols - col_offset);
|
|
|
|
uvec tmp(n_rows * n_cols, arma_nozeros_indicator()); // worst case scenario
|
|
uword* tmp_mem = tmp.memptr();
|
|
uword count = 0;
|
|
|
|
for(uword col=0; col < col_offset; ++col)
|
|
{
|
|
const uword index_offset = (n_rows * col);
|
|
|
|
for(uword row=0; row < n_rows; ++row)
|
|
{
|
|
tmp_mem[count] = index_offset + row;
|
|
++count;
|
|
}
|
|
}
|
|
|
|
for(uword i=0; i<N; ++i)
|
|
{
|
|
const uword start_row = i + row_offset;
|
|
const uword col = i + col_offset;
|
|
|
|
const uword index_offset = (n_rows * col);
|
|
|
|
for(uword row=start_row; row < n_rows; ++row)
|
|
{
|
|
tmp_mem[count] = index_offset + row;
|
|
++count;
|
|
}
|
|
}
|
|
|
|
uvec out;
|
|
|
|
out.steal_mem_col(tmp, count);
|
|
|
|
return out;
|
|
}
|
|
|
|
|
|
|
|
//! @}
|