70 lines
2.1 KiB
C++
70 lines
2.1 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_cor
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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_cor::apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_cor>& 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 uword norm_type = X.aux_uword;
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const unwrap<T1> UA(X.A);
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const unwrap<T2> UB(X.B);
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const Mat<eT>& A = UA.M;
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const Mat<eT>& B = UB.M;
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const Mat<eT>& AA = (A.n_rows == 1)
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? Mat<eT>(const_cast<eT*>(A.memptr()), A.n_cols, A.n_rows, false, false)
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: Mat<eT>(const_cast<eT*>(A.memptr()), A.n_rows, A.n_cols, false, false);
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const Mat<eT>& BB = (B.n_rows == 1)
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? Mat<eT>(const_cast<eT*>(B.memptr()), B.n_cols, B.n_rows, false, false)
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: Mat<eT>(const_cast<eT*>(B.memptr()), B.n_rows, B.n_cols, false, false);
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arma_debug_assert_mul_size(AA, BB, true, false, "cor()");
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if( (AA.n_elem == 0) || (BB.n_elem == 0) )
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{
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out.reset();
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return;
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}
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const uword N = AA.n_rows;
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const eT norm_val = (norm_type == 0) ? ( (N > 1) ? eT(N-1) : eT(1) ) : eT(N);
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const Mat<eT> tmp1 = AA.each_row() - mean(AA,0);
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const Mat<eT> tmp2 = BB.each_row() - mean(BB,0);
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out = tmp1.t() * tmp2;
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out /= norm_val;
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out /= conv_to< Mat<eT> >::from( stddev(AA).t() * stddev(BB) ); // TODO: check for zeros?
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}
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//! @}
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