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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 spop_sum
//! @{
template<typename T1>
arma_hot
inline
void
spop_sum::apply(SpMat<typename T1::elem_type>& out, const SpOp<T1,spop_sum>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword dim = in.aux_uword_a;
arma_debug_check( (dim > 1), "sum(): parameter 'dim' must be 0 or 1" );
const SpProxy<T1> p(in.m);
const uword p_n_rows = p.get_n_rows();
const uword p_n_cols = p.get_n_cols();
if(p.get_n_nonzero() == 0)
{
if(dim == 0) { out.zeros(1,p_n_cols); }
if(dim == 1) { out.zeros(p_n_rows,1); }
return;
}
if(dim == 0) // find the sum in each column
{
Row<eT> acc(p_n_cols, fill::zeros);
eT* acc_mem = acc.memptr();
if(SpProxy<T1>::use_iterator)
{
typename SpProxy<T1>::const_iterator_type it = p.begin();
const uword N = p.get_n_nonzero();
for(uword i=0; i < N; ++i)
{
acc_mem[it.col()] += (*it);
++it;
}
}
else
{
for(uword col = 0; col < p_n_cols; ++col)
{
acc_mem[col] = arrayops::accumulate
(
&p.get_values()[p.get_col_ptrs()[col]],
p.get_col_ptrs()[col + 1] - p.get_col_ptrs()[col]
);
}
}
out = acc;
}
else
if(dim == 1) // find the sum in each row
{
Col<eT> acc(p_n_rows, fill::zeros);
eT* acc_mem = acc.memptr();
typename SpProxy<T1>::const_iterator_type it = p.begin();
const uword N = p.get_n_nonzero();
for(uword i=0; i < N; ++i)
{
acc_mem[it.row()] += (*it);
++it;
}
out = acc;
}
}
//! @}
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