max@0: // Copyright (C) 2008-2011 NICTA (www.nicta.com.au)
max@0: // Copyright (C) 2008-2011 Conrad Sanderson
max@0: // 
max@0: // This file is part of the Armadillo C++ library.
max@0: // It is provided without any warranty of fitness
max@0: // for any purpose. You can redistribute this file
max@0: // and/or modify it under the terms of the GNU
max@0: // Lesser General Public License (LGPL) as published
max@0: // by the Free Software Foundation, either version 3
max@0: // of the License or (at your option) any later version.
max@0: // (see http://www.opensource.org/licenses for more info)
max@0: 
max@0: 
max@0: //! \addtogroup fn_lu
max@0: //! @{
max@0: 
max@0: 
max@0: 
max@0: //! immediate lower upper decomposition, permutation info is embedded into L (similar to Matlab/Octave)
max@0: template<typename T1>
max@0: inline
max@0: bool
max@0: lu
max@0:   (
max@0:          Mat<typename T1::elem_type>&    L,
max@0:          Mat<typename T1::elem_type>&    U,
max@0:   const Base<typename T1::elem_type,T1>& X,
max@0:   const typename arma_blas_type_only<typename T1::elem_type>::result* junk = 0
max@0:   )
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   arma_ignore(junk);
max@0:   
max@0:   arma_debug_check( (&L == &U), "lu(): L and U are the same object");
max@0:   
max@0:   const bool status = auxlib::lu(L, U, X);
max@0:   
max@0:   if(status == false)
max@0:     {
max@0:     L.reset();
max@0:     U.reset();
max@0:     arma_bad("lu(): failed to converge", false);
max@0:     }
max@0:   
max@0:   return status;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! immediate lower upper decomposition, also providing the permutation matrix
max@0: template<typename T1>
max@0: inline
max@0: bool
max@0: lu
max@0:   (
max@0:          Mat<typename T1::elem_type>&    L,
max@0:          Mat<typename T1::elem_type>&    U, 
max@0:          Mat<typename T1::elem_type>&    P,
max@0:   const Base<typename T1::elem_type,T1>& X,
max@0:   const typename arma_blas_type_only<typename T1::elem_type>::result* junk = 0
max@0:   )
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   arma_ignore(junk);
max@0:   
max@0:   arma_debug_check( ( (&L == &U) || (&L == &P) || (&U == &P) ), "lu(): two or more output objects are the same object");
max@0:   
max@0:   const bool status = auxlib::lu(L, U, P, X);
max@0:   
max@0:   if(status == false)
max@0:     {
max@0:     L.reset();
max@0:     U.reset();
max@0:     P.reset();
max@0:     arma_bad("lu(): failed to converge", false);
max@0:     }
max@0:   
max@0:   return status;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! @}