104 lines
2.4 KiB
C++
104 lines
2.4 KiB
C++
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
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// Copyright 2008-2016 National ICT Australia (NICTA)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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//! \addtogroup spop_sum
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//! @{
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template<typename T1>
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arma_hot
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inline
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void
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spop_sum::apply(SpMat<typename T1::elem_type>& out, const SpOp<T1,spop_sum>& in)
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{
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arma_extra_debug_sigprint();
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typedef typename T1::elem_type eT;
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const uword dim = in.aux_uword_a;
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arma_debug_check( (dim > 1), "sum(): parameter 'dim' must be 0 or 1" );
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const SpProxy<T1> p(in.m);
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const uword p_n_rows = p.get_n_rows();
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const uword p_n_cols = p.get_n_cols();
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if(p.get_n_nonzero() == 0)
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{
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if(dim == 0) { out.zeros(1,p_n_cols); }
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if(dim == 1) { out.zeros(p_n_rows,1); }
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return;
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}
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if(dim == 0) // find the sum in each column
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{
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Row<eT> acc(p_n_cols, arma_zeros_indicator());
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eT* acc_mem = acc.memptr();
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if(SpProxy<T1>::use_iterator)
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{
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typename SpProxy<T1>::const_iterator_type it = p.begin();
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const uword N = p.get_n_nonzero();
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for(uword i=0; i < N; ++i)
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{
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acc_mem[it.col()] += (*it);
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++it;
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}
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}
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else
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{
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for(uword col = 0; col < p_n_cols; ++col)
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{
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acc_mem[col] = arrayops::accumulate
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(
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&p.get_values()[p.get_col_ptrs()[col]],
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p.get_col_ptrs()[col + 1] - p.get_col_ptrs()[col]
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);
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}
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}
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out = acc;
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}
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else
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if(dim == 1) // find the sum in each row
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{
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Col<eT> acc(p_n_rows, arma_zeros_indicator());
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eT* acc_mem = acc.memptr();
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typename SpProxy<T1>::const_iterator_type it = p.begin();
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const uword N = p.get_n_nonzero();
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for(uword i=0; i < N; ++i)
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{
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acc_mem[it.row()] += (*it);
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++it;
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}
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out = acc;
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}
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}
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//! @}
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