op_neg_meat.hpp

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00001 // Copyright (C) 2009 NICTA
00002 // 
00003 // Authors:
00004 // - Conrad Sanderson (conradsand at ieee dot org)
00005 // 
00006 // This file is part of the Armadillo C++ library.
00007 // It is provided without any warranty of fitness
00008 // for any purpose. You can redistribute this file
00009 // and/or modify it under the terms of the GNU
00010 // Lesser General Public License (LGPL) as published
00011 // by the Free Software Foundation, either version 3
00012 // of the License or (at your option) any later version.
00013 // (see http://www.opensource.org/licenses for more info)
00014 
00015 
00016 
00017 //! \addtogroup op_neg
00018 //! @{
00019 
00020 //! Negate all element of a matrix and store the result in a dense matrix
00021 template<typename T1>
00022 inline
00023 void
00024 op_neg::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_neg> &in)
00025   {
00026   arma_extra_debug_sigprint();
00027   
00028   typedef typename T1::elem_type eT;
00029   
00030   const unwrap<T1> tmp(in.m);
00031   const Mat<eT>& X = tmp.M;
00032   
00033   // no alias problems
00034   out.set_size(X.n_rows, X.n_cols);
00035   
00036   const eT* X_mem = X.mem;
00037   eT* out_mem = out.memptr();
00038   
00039   
00040   for(u32 i=0; i<X.n_elem; ++i)
00041     {
00042     out_mem[i] = -X_mem[i];
00043     }
00044     
00045   }
00046 
00047 //! @}