Chris@49: // Copyright (C) 2010-2013 NICTA (www.nicta.com.au)
Chris@49: // Copyright (C) 2010-2013 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: 
Chris@49: //! \addtogroup glue_cross
Chris@49: //! @{
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename T1, typename T2>
Chris@49: inline
Chris@49: void
Chris@49: glue_cross::apply(Mat<typename T1::elem_type>& out, const Glue<T1, T2, glue_cross>& X)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   typedef typename T1::elem_type eT;
Chris@49:   
Chris@49:   const Proxy<T1> PA(X.A);
Chris@49:   const Proxy<T2> PB(X.B);
Chris@49:   
Chris@49:   arma_debug_check( ((PA.get_n_elem() != 3) || (PB.get_n_elem() != 3)), "cross(): input vectors must have 3 elements" );
Chris@49:   
Chris@49:   const uword PA_n_rows = Proxy<T1>::is_row ? 1 : PA.get_n_rows();
Chris@49:   const uword PA_n_cols = Proxy<T1>::is_col ? 1 : PA.get_n_cols();
Chris@49:   
Chris@49:   out.set_size(PA_n_rows, PA_n_cols);
Chris@49:   
Chris@49:   eT* out_mem = out.memptr();
Chris@49:   
Chris@49:   if( (Proxy<T1>::prefer_at_accessor == false) && (Proxy<T2>::prefer_at_accessor == false) )
Chris@49:     {
Chris@49:     typename Proxy<T1>::ea_type A = PA.get_ea();
Chris@49:     typename Proxy<T2>::ea_type B = PB.get_ea();
Chris@49:     
Chris@49:     const eT ax = A[0];
Chris@49:     const eT ay = A[1];
Chris@49:     const eT az = A[2];
Chris@49:     
Chris@49:     const eT bx = B[0];
Chris@49:     const eT by = B[1];
Chris@49:     const eT bz = B[2];
Chris@49:     
Chris@49:     out_mem[0] = ay*bz - az*by;
Chris@49:     out_mem[1] = az*bx - ax*bz;
Chris@49:     out_mem[2] = ax*by - ay*bx;
Chris@49:     }
Chris@49:   else
Chris@49:     {
Chris@49:     const bool PA_is_col = Proxy<T1>::is_col ? true : (PA_n_cols       == 1);
Chris@49:     const bool PB_is_col = Proxy<T2>::is_col ? true : (PB.get_n_cols() == 1);
Chris@49:     
Chris@49:     const eT ax = PA.at(0,0);
Chris@49:     const eT ay = PA_is_col ? PA.at(1,0) : PA.at(0,1);
Chris@49:     const eT az = PA_is_col ? PA.at(2,0) : PA.at(0,2);
Chris@49:     
Chris@49:     const eT bx = PB.at(0,0);
Chris@49:     const eT by = PB_is_col ? PB.at(1,0) : PB.at(0,1);
Chris@49:     const eT bz = PB_is_col ? PB.at(2,0) : PB.at(0,2);
Chris@49:     
Chris@49:     out_mem[0] = ay*bz - az*by;
Chris@49:     out_mem[1] = az*bx - ax*bz;
Chris@49:     out_mem[2] = ax*by - ay*bx;
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! @}