83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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//
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// 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_sp_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_sp_nonzeros::apply(Mat<typename T1::elem_type>& out, const SpToDOp<T1, op_sp_nonzeros>& X)
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{
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arma_debug_sigprint();
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typedef typename T1::elem_type eT;
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if(is_SpMat<T1>::value || is_SpMat<typename SpProxy<T1>::stored_type>::value)
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{
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const unwrap_spmat<T1> U(X.m);
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out.set_size(U.M.n_nonzero,1);
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arrayops::copy(out.memptr(), U.M.values, U.M.n_nonzero);
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return;
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}
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if(is_SpSubview<T1>::value)
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{
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const SpSubview<eT>& sv = reinterpret_cast< const SpSubview<eT>& >(X.m);
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if(sv.n_rows == sv.m.n_rows)
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{
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arma_debug_print("op_sp_nonzeros::apply(): SpSubview optimisation");
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const SpMat<eT>& m = sv.m;
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const uword col = sv.aux_col1;
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const uword N = sv.n_nonzero;
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out.set_size(N, 1);
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arrayops::copy(out.memptr(), &(m.values[ m.col_ptrs[col] ]), N);
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return;
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}
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}
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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) { return; }
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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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