00001 // Copyright (C) 2010 NICTA and the authors listed below 00002 // http://nicta.com.au 00003 // 00004 // Authors: 00005 // - Conrad Sanderson (conradsand at ieee dot org) 00006 // 00007 // This file is part of the Armadillo C++ library. 00008 // It is provided without any warranty of fitness 00009 // for any purpose. You can redistribute this file 00010 // and/or modify it under the terms of the GNU 00011 // Lesser General Public License (LGPL) as published 00012 // by the Free Software Foundation, either version 3 00013 // of the License or (at your option) any later version. 00014 // (see http://www.opensource.org/licenses for more info) 00015 00016 00017 //! \addtogroup fn_diagvec 00018 //! @{ 00019 00020 00021 //! extract a diagonal from a matrix 00022 template<typename T1> 00023 arma_inline 00024 const Op<T1, op_diagvec> 00025 diagvec(const Base<typename T1::elem_type,T1>& X, const s32 diag_id = 0) 00026 { 00027 arma_extra_debug_sigprint(); 00028 00029 return Op<T1, op_diagvec>(X.get_ref(), ((diag_id < 0) ? -diag_id : diag_id), ((diag_id < 0) ? 1 : 0) ); 00030 } 00031 00032 00033 00034 //! @}