77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
// Copyright (C) 2010-2013 National ICT Australia (NICTA)
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// -------------------------------------------------------------------
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//
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// Written by Conrad Sanderson - http://conradsanderson.id.au
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//! \addtogroup glue_cross
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//! @{
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template<typename T1, typename T2>
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inline
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void
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glue_cross::apply(Mat<typename T1::elem_type>& out, const Glue<T1, T2, glue_cross>& X)
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{
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arma_extra_debug_sigprint();
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typedef typename T1::elem_type eT;
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const Proxy<T1> PA(X.A);
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const Proxy<T2> PB(X.B);
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arma_debug_check( ((PA.get_n_elem() != 3) || (PB.get_n_elem() != 3)), "cross(): input vectors must have 3 elements" );
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const uword PA_n_rows = Proxy<T1>::is_row ? 1 : PA.get_n_rows();
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const uword PA_n_cols = Proxy<T1>::is_col ? 1 : PA.get_n_cols();
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out.set_size(PA_n_rows, PA_n_cols);
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eT* out_mem = out.memptr();
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if( (Proxy<T1>::prefer_at_accessor == false) && (Proxy<T2>::prefer_at_accessor == false) )
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{
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typename Proxy<T1>::ea_type A = PA.get_ea();
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typename Proxy<T2>::ea_type B = PB.get_ea();
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const eT ax = A[0];
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const eT ay = A[1];
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const eT az = A[2];
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const eT bx = B[0];
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const eT by = B[1];
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const eT bz = B[2];
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out_mem[0] = ay*bz - az*by;
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out_mem[1] = az*bx - ax*bz;
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out_mem[2] = ax*by - ay*bx;
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}
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else
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{
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const bool PA_is_col = Proxy<T1>::is_col ? true : (PA_n_cols == 1);
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const bool PB_is_col = Proxy<T2>::is_col ? true : (PB.get_n_cols() == 1);
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const eT ax = PA.at(0,0);
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const eT ay = PA_is_col ? PA.at(1,0) : PA.at(0,1);
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const eT az = PA_is_col ? PA.at(2,0) : PA.at(0,2);
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const eT bx = PB.at(0,0);
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const eT by = PB_is_col ? PB.at(1,0) : PB.at(0,1);
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const eT bz = PB_is_col ? PB.at(2,0) : PB.at(0,2);
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out_mem[0] = ay*bz - az*by;
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out_mem[1] = az*bx - ax*bz;
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out_mem[2] = ax*by - ay*bx;
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}
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}
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//! @}
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