135 lines
3.0 KiB
C++
135 lines
3.0 KiB
C++
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// Copyright (C) 2008-2012 National ICT Australia (NICTA)
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// -------------------------------------------------------------------
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//
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// Written by Conrad Sanderson - http://conradsanderson.id.au
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//! \addtogroup op_diagvec
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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_diagvec::apply(Mat<typename T1::elem_type>& out, const Op<T1, op_diagvec>& 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 uword a = X.aux_uword_a;
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const uword b = X.aux_uword_b;
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const uword row_offset = (b > 0) ? a : 0;
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const uword col_offset = (b == 0) ? a : 0;
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const Proxy<T1> P(X.m);
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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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arma_debug_check
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(
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((row_offset > 0) && (row_offset >= n_rows)) || ((col_offset > 0) && (col_offset >= n_cols)),
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"diagvec(): requested diagonal is out of bounds"
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);
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const uword len = (std::min)(n_rows - row_offset, n_cols - col_offset);
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if( (is_Mat<typename Proxy<T1>::stored_type>::value) && (Proxy<T1>::fake_mat == false) )
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{
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op_diagvec::apply_unwrap(out, P.Q, row_offset, col_offset, len);
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}
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else
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{
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if(P.is_alias(out) == false)
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{
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op_diagvec::apply_proxy(out, P, row_offset, col_offset, len);
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}
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else
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{
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Mat<eT> tmp;
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op_diagvec::apply_proxy(tmp, P, row_offset, col_offset, len);
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out.steal_mem(tmp);
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}
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}
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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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op_diagvec::apply_unwrap(Mat<typename T1::elem_type>& out, const T1& X, const uword row_offset, const uword col_offset, const uword len)
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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 unwrap_check<T1> tmp_A(X, out);
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const Mat<eT>& A = tmp_A.M;
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out.set_size(len, 1);
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eT* out_mem = out.memptr();
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uword i,j;
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for(i=0, j=1; j < len; i+=2, j+=2)
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{
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const eT tmp_i = A.at( i + row_offset, i + col_offset );
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const eT tmp_j = A.at( j + row_offset, j + col_offset );
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out_mem[i] = tmp_i;
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out_mem[j] = tmp_j;
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}
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if(i < len)
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{
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out_mem[i] = A.at( i + row_offset, i + col_offset );
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}
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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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op_diagvec::apply_proxy(Mat<typename T1::elem_type>& out, const Proxy<T1>& P, const uword row_offset, const uword col_offset, const uword len)
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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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out.set_size(len, 1);
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eT* out_mem = out.memptr();
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uword i,j;
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for(i=0, j=1; j < len; i+=2, j+=2)
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{
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const eT tmp_i = P.at( i + row_offset, i + col_offset );
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const eT tmp_j = P.at( j + row_offset, j + col_offset );
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out_mem[i] = tmp_i;
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out_mem[j] = tmp_j;
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}
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if(i < len)
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{
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out_mem[i] = P.at( i + row_offset, i + col_offset );
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}
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}
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//! @}
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