136 lines
2.9 KiB
C++
136 lines
2.9 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 op_nonzeros
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//! @{
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template<typename T1>
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inline
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void
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op_nonzeros::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& P)
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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 N_max = P.get_n_elem();
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Mat<eT> tmp(N_max, 1, arma_nozeros_indicator());
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eT* tmp_mem = tmp.memptr();
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uword N_nz = 0;
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if(Proxy<T1>::use_at == false)
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{
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typename Proxy<T1>::ea_type Pea = P.get_ea();
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for(uword i=0; i<N_max; ++i)
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{
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const eT val = Pea[i];
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if(val != eT(0)) { tmp_mem[N_nz] = val; ++N_nz; }
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}
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}
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else
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{
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const uword n_rows = P.get_n_rows();
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const uword n_cols = P.get_n_cols();
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for(uword col=0; col < n_cols; ++col)
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for(uword row=0; row < n_rows; ++row)
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{
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const eT val = P.at(row,col);
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if(val != eT(0)) { tmp_mem[N_nz] = val; ++N_nz; }
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}
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}
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out.steal_mem_col(tmp, N_nz);
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}
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template<typename T1>
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inline
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void
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op_nonzeros::apply(Mat<typename T1::elem_type>& out, const Op<T1, op_nonzeros>& X)
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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 Proxy<T1> P(X.m);
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if(P.get_n_elem() == 0) { out.set_size(0,1); return; }
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if(P.is_alias(out))
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{
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Mat<eT> out2;
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op_nonzeros::apply_noalias(out2, P);
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out.steal_mem(out2);
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}
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else
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{
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op_nonzeros::apply_noalias(out, P);
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}
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}
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template<typename T1>
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inline
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void
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op_nonzeros_spmat::apply(Mat<typename T1::elem_type>& out, const SpToDOp<T1, op_nonzeros_spmat>& X)
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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 SpProxy<T1> P(X.m);
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const uword N = P.get_n_nonzero();
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out.set_size(N,1);
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if(N > 0)
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{
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if(is_SpMat<typename SpProxy<T1>::stored_type>::value)
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{
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const unwrap_spmat<typename SpProxy<T1>::stored_type> U(P.Q);
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arrayops::copy(out.memptr(), U.M.values, N);
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}
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else
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{
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eT* out_mem = out.memptr();
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typename SpProxy<T1>::const_iterator_type it = P.begin();
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for(uword i=0; i<N; ++i) { out_mem[i] = (*it); ++it; }
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}
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}
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}
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//! @}
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