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// 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 spglue_kron
//! @{
template<typename T1, typename T2>
inline
void
spglue_kron::apply(SpMat<typename T1::elem_type>& out, const SpGlue<T1,T2,spglue_kron>& X)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const unwrap_spmat<T1> UA(X.A);
const unwrap_spmat<T2> UB(X.B);
if(UA.is_alias(out) || UB.is_alias(out))
{
SpMat<eT> tmp;
spglue_kron::apply_noalias(tmp, UA.M, UB.M);
out.steal_mem(tmp);
}
else
{
spglue_kron::apply_noalias(out, UA.M, UB.M);
}
}
template<typename eT>
inline
void
spglue_kron::apply_noalias(SpMat<eT>& out, const SpMat<eT>& A, const SpMat<eT>& B)
{
arma_extra_debug_sigprint();
const uword A_n_rows = A.n_rows;
const uword A_n_cols = A.n_cols;
const uword B_n_rows = B.n_rows;
const uword B_n_cols = B.n_cols;
const uword out_n_nonzero = A.n_nonzero * 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_i = A.col_ptrs[A_col]; A_i < A.col_ptrs[A_col+1]; ++A_i)
{
const uword out_row = A.row_indices[A_i] * B_n_rows;
const eT A_val = A.values[A_i];
for(uword B_i = B.col_ptrs[B_col]; B_i < B.col_ptrs[B_col+1]; ++B_i)
{
access::rw(out.values[count]) = A_val * 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, typename T2>
// inline
// void
// spglue_kron::apply(SpMat<typename T1::elem_type>& out, const SpGlue<T1,T2,spglue_kron>& X)
// {
// arma_extra_debug_sigprint();
//
// typedef typename T1::elem_type eT;
//
// const unwrap_spmat<T1> UA(X.A);
// const unwrap_spmat<T2> UB(X.B);
//
// const SpMat<eT>& A = UA.M;
// const SpMat<eT>& B = UB.M;
//
// umat locs(2, A.n_nonzero * B.n_nonzero);
// Col<eT> vals( A.n_nonzero * B.n_nonzero);
//
// uword* locs_mem = locs.memptr();
// eT* vals_mem = vals.memptr();
//
// typename SpMat<eT>::const_iterator A_it = A.begin();
// typename SpMat<eT>::const_iterator A_it_end = A.end();
//
// typename SpMat<eT>::const_iterator B_it_start = B.begin();
// typename SpMat<eT>::const_iterator B_it_end = B.end();
//
// const uword B_n_rows = B.n_rows;
// const uword B_n_cols = B.n_cols;
//
// uword i = 0;
//
// while(A_it != A_it_end)
// {
// typename SpMat<eT>::const_iterator B_it = B_it_start;
//
// const uword loc_row = A_it.row() * B_n_rows;
// const uword loc_col = A_it.col() * B_n_cols;
//
// const eT A_val = (*A_it);
//
// while(B_it != B_it_end)
// {
// (*locs_mem) = loc_row + B_it.row(); locs_mem++;
// (*locs_mem) = loc_col + B_it.col(); locs_mem++;
//
// vals_mem[i] = A_val * (*B_it);
//
// ++i;
// ++B_it;
// }
//
// ++A_it;
// }
//
// out = SpMat<eT>(locs, vals, A.n_rows*B.n_rows, A.n_cols*B.n_cols);
// }
//! @}
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