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_inv
max@0: //! @{
max@0: 
max@0: 
max@0: 
max@0: //! delayed matrix inverse (general matrices)
max@0: template<typename T1>
max@0: arma_inline
max@0: const Op<T1, op_inv>
max@0: inv
max@0:   (
max@0:   const Base<typename T1::elem_type,T1>& X,
max@0:   const bool slow = false,
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:   return Op<T1, op_inv>(X.get_ref(), ((slow == false) ? 0 : 1), 0);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! remove the inverse operation if applied twice consecutively
max@0: template<typename T1>
max@0: arma_inline
max@0: const T1&
max@0: inv(const Op<T1, op_inv>& X, const bool slow = false)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   arma_ignore(slow);
max@0:   
max@0:   return X.m;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! delayed matrix inverse (triangular matrices)
max@0: template<typename T1>
max@0: arma_inline
max@0: const Op<T1, op_inv_tr>
max@0: inv
max@0:   (
max@0:   const Op<T1, op_trimat>& X,
max@0:   const bool slow = false,
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(slow);
max@0:   arma_ignore(junk);
max@0:   
max@0:   return Op<T1, op_inv_tr>(X.m, X.aux_uword_a, 0);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! delayed matrix inverse (symmetric positive definite matrices)
max@0: template<typename T1>
max@0: arma_inline
max@0: const Op<T1, op_inv_sympd>
max@0: inv
max@0:   (
max@0:   const Op<T1, op_sympd>& X,
max@0:   const bool slow = false,
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(slow);
max@0:   arma_ignore(junk);
max@0:   
max@0:   return Op<T1, op_inv_sympd>(X.m, 0, 0);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1>
max@0: inline
max@0: bool
max@0: inv
max@0:   (
max@0:          Mat<typename T1::elem_type>&    out,
max@0:   const Base<typename T1::elem_type,T1>& X,
max@0:   const bool slow = false,
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:   try
max@0:     {
max@0:     out = inv(X,slow);
max@0:     }
max@0:   catch(std::runtime_error&)
max@0:     {
max@0:     return false;
max@0:     }
max@0:   
max@0:   return true;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! @}