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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 spop_repmat
//! @{
template<typename T1>
inline
void
spop_repmat::apply(SpMat<typename T1::elem_type>& out, const SpOp<T1,spop_repmat>& X)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const unwrap_spmat<T1> U(X.m);
if(U.is_alias(out))
{
SpMat<eT> tmp;
spop_repmat::apply_noalias(tmp, X.aux_uword_a, X.aux_uword_b, U.M);
out.steal_mem(tmp);
}
else
{
spop_repmat::apply_noalias(out, X.aux_uword_a, X.aux_uword_b, U.M);
}
}
template<typename eT>
inline
void
spop_repmat::apply_noalias(SpMat<eT>& out, const uword A_n_rows, const uword A_n_cols, const SpMat<eT>& B)
{
arma_extra_debug_sigprint();
const uword B_n_rows = B.n_rows;
const uword B_n_cols = B.n_cols;
const uword out_n_nonzero = A_n_rows * A_n_cols * B.n_nonzero;
out.reserve(A_n_rows * B_n_rows, A_n_cols * B_n_cols, out_n_nonzero);
if(out_n_nonzero == 0) { return; }
access::rw(out.col_ptrs[0]) = 0;
uword count = 0;
for(uword A_col=0; A_col < A_n_cols; ++A_col)
for(uword B_col=0; B_col < B_n_cols; ++B_col)
{
for(uword A_row=0; A_row < A_n_rows; ++A_row)
{
const uword out_row = A_row * B_n_rows;
for(uword B_i = B.col_ptrs[B_col]; B_i < B.col_ptrs[B_col+1]; ++B_i)
{
access::rw(out.values[count]) = B.values[B_i];
access::rw(out.row_indices[count]) = out_row + B.row_indices[B_i];
count++;
}
}
access::rw(out.col_ptrs[A_col * B_n_cols + B_col + 1]) = count;
}
}
// template<typename T1>
// inline
// void
// spop_repmat::apply(SpMat<typename T1::elem_type>& out, const SpOp<T1, spop_repmat>& in)
// {
// arma_extra_debug_sigprint();
//
// typedef typename T1::elem_type eT;
//
// const unwrap_spmat<T1> U(in.m);
// const SpMat<eT>& X = U.M;
//
// const uword X_n_rows = X.n_rows;
// const uword X_n_cols = X.n_cols;
//
// const uword copies_per_row = in.aux_uword_a;
// const uword copies_per_col = in.aux_uword_b;
//
// // out.set_size(X_n_rows * copies_per_row, X_n_cols * copies_per_col);
// //
// // const uword out_n_rows = out.n_rows;
// // const uword out_n_cols = out.n_cols;
// //
// // if( (out_n_rows > 0) && (out_n_cols > 0) )
// // {
// // for(uword col = 0; col < out_n_cols; col += X_n_cols)
// // for(uword row = 0; row < out_n_rows; row += X_n_rows)
// // {
// // out.submat(row, col, row+X_n_rows-1, col+X_n_cols-1) = X;
// // }
// // }
//
// const uword out_n_rows = X_n_rows * copies_per_row;
// const uword out_n_cols = X_n_cols * copies_per_col;
// const uword out_nnz = X.n_nonzero * copies_per_row * copies_per_col;
//
// if( (out_n_rows > 0) && (out_n_cols > 0) && (out_nnz > 0) )
// {
// umat locs(2, out_nnz, arma_nozeros_indicator());
// Col<eT> vals( out_nnz, arma_nozeros_indicator());
//
// uword* locs_mem = locs.memptr();
// eT* vals_mem = vals.memptr();
//
// typename SpMat<eT>::const_iterator X_begin = X.begin();
// typename SpMat<eT>::const_iterator X_end = X.end();
// typename SpMat<eT>::const_iterator X_it;
//
// for(uword col_offset = 0; col_offset < out_n_cols; col_offset += X_n_cols)
// for(uword row_offset = 0; row_offset < out_n_rows; row_offset += X_n_rows)
// {
// for(X_it = X_begin; X_it != X_end; ++X_it)
// {
// const uword out_row = row_offset + X_it.row();
// const uword out_col = col_offset + X_it.col();
//
// (*locs_mem) = out_row; ++locs_mem;
// (*locs_mem) = out_col; ++locs_mem;
//
// (*vals_mem) = (*X_it); ++vals_mem;
// }
// }
//
// out = SpMat<eT>(locs, vals, out_n_rows, out_n_cols);
// }
// else
// {
// out.zeros(out_n_rows, out_n_cols);
// }
// }
//! @}
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