max@0: // Copyright (C) 2009-2011 NICTA (www.nicta.com.au)
max@0: // Copyright (C) 2009-2011 Conrad Sanderson
max@0: // Copyright (C) 2009-2010 Dimitrios Bouzas
max@0: // 
max@0: // This file is part of the Armadillo C++ library.
max@0: // It is provided without any warranty of fitness
max@0: // for any purpose. You can redistribute this file
max@0: // and/or modify it under the terms of the GNU
max@0: // Lesser General Public License (LGPL) as published
max@0: // by the Free Software Foundation, either version 3
max@0: // of the License or (at your option) any later version.
max@0: // (see http://www.opensource.org/licenses for more info)
max@0: 
max@0: 
max@0: 
max@0: //! \addtogroup op_cor
max@0: //! @{
max@0: 
max@0: 
max@0: 
max@0: template<typename eT>
max@0: inline
max@0: void
max@0: op_cor::direct_cor(Mat<eT>& out, const Mat<eT>& A, const uword norm_type)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   if(A.is_empty())
max@0:     {
max@0:     out.reset();
max@0:     return;
max@0:     }
max@0:   
max@0:   if(A.is_vec())
max@0:     {
max@0:     out.set_size(1,1);
max@0:     out[0] = eT(1);
max@0:     }
max@0:   else
max@0:     {
max@0:     const uword N = A.n_rows;
max@0:     const eT norm_val = (norm_type == 0) ? ( (N > 1) ? eT(N-1) : eT(1) ) : eT(N);
max@0: 
max@0:     const Row<eT> acc = sum(A);
max@0:     const Row<eT> sd  = stddev(A);
max@0: 
max@0:     out = (trans(A) * A);
max@0:     out -= (trans(acc) * acc)/eT(N);
max@0:     out /= norm_val;
max@0:     out /= trans(sd) * sd;
max@0:     }
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T>
max@0: inline
max@0: void
max@0: op_cor::direct_cor(Mat< std::complex<T> >& out, const Mat< std::complex<T> >& A, const uword norm_type)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0: 
max@0:   typedef typename std::complex<T> eT;
max@0: 
max@0:   if(A.is_empty())
max@0:     {
max@0:     out.reset();
max@0:     return;
max@0:     }
max@0:   
max@0:   if(A.is_vec())
max@0:     {
max@0:     out.set_size(1,1);
max@0:     out[0] = eT(1);
max@0:     }
max@0:   else
max@0:     {
max@0:     const uword N = A.n_rows;
max@0:     const eT norm_val = (norm_type == 0) ? ( (N > 1) ? eT(N-1) : eT(1) ) : eT(N);
max@0: 
max@0:     const Row<eT> acc = sum(A);
max@0:     const Row<T>  sd  = stddev(A);
max@0: 
max@0:     out = trans(A) * A;               // out = strans(conj(A)) * A;
max@0:     out -= (trans(acc) * acc)/eT(N);  // out -= (strans(conj(acc)) * acc)/eT(N);
max@0:     out /= norm_val;
max@0: 
max@0:     //out = out / (trans(sd) * sd);
max@0:     out /= conv_to< Mat<eT> >::from(trans(sd) * sd);
max@0:     }
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1>
max@0: inline
max@0: void
max@0: op_cor::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_cor>& in)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   typedef typename T1::elem_type eT;
max@0:   
max@0:   const unwrap_check<T1> tmp(in.m, out);
max@0:   const Mat<eT>& A     = tmp.M;
max@0:   
max@0:   const uword norm_type = in.aux_uword_a;
max@0:   
max@0:   op_cor::direct_cor(out, A, norm_type);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! @}