186 lines
4.0 KiB
C++
186 lines
4.0 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 spop_reverse
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//! @{
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template<typename eT>
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inline
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void
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spop_reverse::apply_spmat(SpMat<eT>& out, const SpMat<eT>& X, const uword dim)
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{
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arma_extra_debug_sigprint();
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const uword X_n_rows = X.n_rows;
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const uword X_n_cols = X.n_cols;
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const uword X_n_rows_m1 = X_n_rows - 1;
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const uword X_n_cols_m1 = X_n_cols - 1;
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const uword N = X.n_nonzero;
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if(N == uword(0))
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{
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out.zeros(X_n_rows, X_n_cols);
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return;
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}
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umat locs(2, N, arma_nozeros_indicator());
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uword* locs_mem = locs.memptr();
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typename SpMat<eT>::const_iterator it = X.begin();
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if(dim == 0)
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{
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for(uword i=0; i < N; ++i)
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{
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const uword row = it.row();
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const uword col = it.col();
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(*locs_mem) = X_n_rows_m1 - row; locs_mem++;
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(*locs_mem) = col; locs_mem++;
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++it;
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}
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}
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else
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if(dim == 1)
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{
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for(uword i=0; i < N; ++i)
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{
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const uword row = it.row();
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const uword col = it.col();
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(*locs_mem) = row; locs_mem++;
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(*locs_mem) = X_n_cols_m1 - col; locs_mem++;
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++it;
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}
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}
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const Col<eT> vals(const_cast<eT*>(X.values), N, false);
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SpMat<eT> tmp(locs, vals, X_n_rows, X_n_cols, true, false);
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out.steal_mem(tmp);
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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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spop_reverse::apply_proxy(SpMat<typename T1::elem_type>& out, const T1& X, const uword dim)
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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);
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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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const uword P_n_rows_m1 = P_n_rows - 1;
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const uword P_n_cols_m1 = P_n_cols - 1;
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const uword N = P.get_n_nonzero();
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if(N == uword(0))
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{
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out.zeros(P_n_rows, P_n_cols);
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return;
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}
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umat locs(2, N, arma_nozeros_indicator());
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Col<eT> vals( N, arma_nozeros_indicator());
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uword* locs_mem = locs.memptr();
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eT* vals_mem = vals.memptr();
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typename SpProxy<T1>::const_iterator_type it = P.begin();
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if(dim == 0)
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{
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for(uword i=0; i < N; ++i)
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{
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const uword row = it.row();
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const uword col = it.col();
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(*locs_mem) = P_n_rows_m1 - row; locs_mem++;
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(*locs_mem) = col; locs_mem++;
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(*vals_mem) = (*it); vals_mem++;
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++it;
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}
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}
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else
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if(dim == 1)
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{
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for(uword i=0; i < N; ++i)
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{
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const uword row = it.row();
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const uword col = it.col();
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(*locs_mem) = row; locs_mem++;
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(*locs_mem) = P_n_cols_m1 - col; locs_mem++;
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(*vals_mem) = (*it); vals_mem++;
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++it;
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}
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}
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SpMat<eT> tmp(locs, vals, P_n_rows, P_n_cols, true, false);
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out.steal_mem(tmp);
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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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spop_reverse::apply(SpMat<typename T1::elem_type>& out, const SpOp<T1,spop_reverse>& in)
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{
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arma_extra_debug_sigprint();
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const uword dim = in.aux_uword_a;
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arma_debug_check( (dim > 1), "reverse(): parameter 'dim' must be 0 or 1" );
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if(is_SpMat<T1>::value)
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{
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const unwrap_spmat<T1> tmp(in.m);
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spop_reverse::apply_spmat(out, tmp.M, dim);
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}
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else
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{
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spop_reverse::apply_proxy(out, in.m, dim);
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}
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}
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//! @}
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