80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
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// Copyright 2008-2016 National ICT Australia (NICTA)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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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(): each vector must have 3 elements" );
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out.set_size(PA.get_n_rows(), PA.get_n_cols());
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eT* out_mem = out.memptr();
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if( (Proxy<T1>::use_at == false) && (Proxy<T2>::use_at == 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.get_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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