Chris@49: // Copyright (C) 2011-2012 NICTA (www.nicta.com.au)
Chris@49: // Copyright (C) 2011-2012 Conrad Sanderson
Chris@49: // 
Chris@49: // This Source Code Form is subject to the terms of the Mozilla Public
Chris@49: // License, v. 2.0. If a copy of the MPL was not distributed with this
Chris@49: // file, You can obtain one at http://mozilla.org/MPL/2.0/.
Chris@49: 
Chris@49: 
Chris@49: //! \addtogroup fn_syl_lyap
Chris@49: //! @{
Chris@49: 
Chris@49: 
Chris@49: //! find the solution of the Sylvester equation AX + XB = C
Chris@49: template<typename T1, typename T2, typename T3>
Chris@49: inline
Chris@49: bool
Chris@49: syl
Chris@49:   (
Chris@49:         Mat <typename T1::elem_type>   & out,
Chris@49:   const Base<typename T1::elem_type,T1>& in_A,
Chris@49:   const Base<typename T1::elem_type,T2>& in_B,
Chris@49:   const Base<typename T1::elem_type,T3>& in_C,
Chris@49:   const typename arma_blas_type_only<typename T1::elem_type>::result* junk = 0
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   arma_ignore(junk);
Chris@49:   
Chris@49:   typedef typename T1::elem_type eT;
Chris@49:   
Chris@49:   const unwrap_check<T1> tmp_A(in_A.get_ref(), out);
Chris@49:   const unwrap_check<T2> tmp_B(in_B.get_ref(), out);
Chris@49:   const unwrap_check<T3> tmp_C(in_C.get_ref(), out);
Chris@49:   
Chris@49:   const Mat<eT>& A = tmp_A.M;
Chris@49:   const Mat<eT>& B = tmp_B.M;
Chris@49:   const Mat<eT>& C = tmp_C.M;
Chris@49:   
Chris@49:   const bool status = auxlib::syl(out, A, B, C);
Chris@49:   
Chris@49:   if(status == false)
Chris@49:     {
Chris@49:     out.reset();
Chris@49:     arma_bad("syl(): equation appears to be singular", false);
Chris@49:     }
Chris@49:   
Chris@49:   return status;
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename T1, typename T2, typename T3>
Chris@49: inline
Chris@49: Mat<typename T1::elem_type>
Chris@49: syl
Chris@49:   (
Chris@49:   const Base<typename T1::elem_type,T1>& in_A,
Chris@49:   const Base<typename T1::elem_type,T2>& in_B,
Chris@49:   const Base<typename T1::elem_type,T3>& in_C,
Chris@49:   const typename arma_blas_type_only<typename T1::elem_type>::result* junk = 0
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   arma_ignore(junk);
Chris@49:   
Chris@49:   typedef typename T1::elem_type eT;
Chris@49:   
Chris@49:   const unwrap<T1> tmp_A( in_A.get_ref() );
Chris@49:   const unwrap<T2> tmp_B( in_B.get_ref() );
Chris@49:   const unwrap<T3> tmp_C( in_C.get_ref() );
Chris@49:   
Chris@49:   const Mat<eT>& A = tmp_A.M;
Chris@49:   const Mat<eT>& B = tmp_B.M;
Chris@49:   const Mat<eT>& C = tmp_C.M;
Chris@49:   
Chris@49:   Mat<eT> out;
Chris@49:   
Chris@49:   const bool status = auxlib::syl(out, A, B, C);
Chris@49:   
Chris@49:   if(status == false)
Chris@49:     {
Chris@49:     out.reset();
Chris@49:     arma_bad("syl(): equation appears to be singular");
Chris@49:     }
Chris@49:   
Chris@49:   return out;
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! @}