Chris@49: // Copyright (C) 2008-2013 NICTA (www.nicta.com.au)
Chris@49: // Copyright (C) 2008-2013 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: //! \addtogroup diagview
Chris@49: //! @{
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: diagview<eT>::~diagview()
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: diagview<eT>::diagview(const Mat<eT>& in_m, const uword in_row_offset, const uword in_col_offset, const uword in_len)
Chris@49:   : m(in_m)
Chris@49:   , row_offset(in_row_offset)
Chris@49:   , col_offset(in_col_offset)
Chris@49:   , n_rows(in_len)
Chris@49:   , n_elem(in_len)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! set a diagonal of our matrix using a diagonal from a foreign matrix
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator= (const diagview<eT>& x)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   diagview<eT>& d = *this;
Chris@49:   
Chris@49:   arma_debug_check( (d.n_elem != x.n_elem), "diagview: diagonals have incompatible lengths");
Chris@49:   
Chris@49:         Mat<eT>& d_m = const_cast< Mat<eT>& >(d.m);
Chris@49:   const Mat<eT>& x_m = x.m;
Chris@49:   
Chris@49:   if(&d_m != &x_m)
Chris@49:     {
Chris@49:     const uword d_n_elem     = d.n_elem;
Chris@49:     const uword d_row_offset = d.row_offset;
Chris@49:     const uword d_col_offset = d.col_offset;
Chris@49:     
Chris@49:     const uword x_row_offset = x.row_offset;
Chris@49:     const uword x_col_offset = x.col_offset;
Chris@49:     
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = x_m.at(ii + x_row_offset, ii + x_col_offset);
Chris@49:       const eT tmp_j = x_m.at(jj + x_row_offset, jj + x_col_offset);
Chris@49:       
Chris@49:       d_m.at(ii + d_row_offset, ii + d_col_offset) = tmp_i;
Chris@49:       d_m.at(jj + d_row_offset, jj + d_col_offset) = tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at(ii + d_row_offset, ii + d_col_offset) = x_m.at(ii + x_row_offset, ii + x_col_offset);
Chris@49:       }
Chris@49:     }
Chris@49:   else
Chris@49:     {
Chris@49:     const Mat<eT> tmp = x;
Chris@49:     
Chris@49:     (*this).operator=(tmp);
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator+=(const eT val)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   Mat<eT>& t_m = const_cast< Mat<eT>& >(m);
Chris@49:   
Chris@49:   const uword t_n_elem     = n_elem;
Chris@49:   const uword t_row_offset = row_offset;
Chris@49:   const uword t_col_offset = col_offset;
Chris@49:   
Chris@49:   for(uword ii=0; ii < t_n_elem; ++ii)
Chris@49:     {
Chris@49:     t_m.at( ii + t_row_offset,  ii + t_col_offset) += val;
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator-=(const eT val)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   Mat<eT>& t_m = const_cast< Mat<eT>& >(m);
Chris@49:   
Chris@49:   const uword t_n_elem     = n_elem;
Chris@49:   const uword t_row_offset = row_offset;
Chris@49:   const uword t_col_offset = col_offset;
Chris@49:   
Chris@49:   for(uword ii=0; ii < t_n_elem; ++ii)
Chris@49:     {
Chris@49:     t_m.at( ii + t_row_offset,  ii + t_col_offset) -= val;
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator*=(const eT val)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   Mat<eT>& t_m = const_cast< Mat<eT>& >(m);
Chris@49:   
Chris@49:   const uword t_n_elem     = n_elem;
Chris@49:   const uword t_row_offset = row_offset;
Chris@49:   const uword t_col_offset = col_offset;
Chris@49:   
Chris@49:   for(uword ii=0; ii < t_n_elem; ++ii)
Chris@49:     {
Chris@49:     t_m.at( ii + t_row_offset,  ii + t_col_offset) *= val;
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator/=(const eT val)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   Mat<eT>& t_m = const_cast< Mat<eT>& >(m);
Chris@49:   
Chris@49:   const uword t_n_elem     = n_elem;
Chris@49:   const uword t_row_offset = row_offset;
Chris@49:   const uword t_col_offset = col_offset;
Chris@49:   
Chris@49:   for(uword ii=0; ii < t_n_elem; ++ii)
Chris@49:     {
Chris@49:     t_m.at( ii + t_row_offset,  ii + t_col_offset) /= val;
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! set a diagonal of our matrix using data from a foreign object
Chris@49: template<typename eT>
Chris@49: template<typename T1>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator= (const Base<eT,T1>& o)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   diagview<eT>& d = *this;
Chris@49:   
Chris@49:   Mat<eT>& d_m = const_cast< Mat<eT>& >(d.m);
Chris@49:   
Chris@49:   const uword d_n_elem     = d.n_elem;
Chris@49:   const uword d_row_offset = d.row_offset;
Chris@49:   const uword d_col_offset = d.col_offset;
Chris@49:     
Chris@49:   const Proxy<T1> P( o.get_ref() );
Chris@49:   
Chris@49:   arma_debug_check
Chris@49:     (
Chris@49:     ( (d.n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
Chris@49:     "diagview: given object has incompatible size"
Chris@49:     );
Chris@49:   
Chris@49:   const bool is_alias = P.is_alias(d_m);
Chris@49:   
Chris@49:   arma_extra_debug_warn(is_alias, "aliasing detected");
Chris@49:   
Chris@49:   if( (is_Mat<typename Proxy<T1>::stored_type>::value == true) || (Proxy<T1>::prefer_at_accessor == true) || (is_alias == true) )
Chris@49:     {
Chris@49:     const unwrap_check<typename Proxy<T1>::stored_type> tmp(P.Q, is_alias);
Chris@49:     const Mat<eT>& x = tmp.M;
Chris@49:     
Chris@49:     const eT* x_mem = x.memptr();
Chris@49:     
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = x_mem[ii];
Chris@49:       const eT tmp_j = x_mem[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) = tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) = tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) = x_mem[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   else
Chris@49:     {
Chris@49:     typename Proxy<T1>::ea_type Pea = P.get_ea();
Chris@49:       
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = Pea[ii];
Chris@49:       const eT tmp_j = Pea[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) = tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) = tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) = Pea[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: template<typename T1>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator+=(const Base<eT,T1>& o)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   diagview<eT>& d = *this;
Chris@49:   
Chris@49:   Mat<eT>& d_m = const_cast< Mat<eT>& >(d.m);
Chris@49:   
Chris@49:   const uword d_n_elem     = d.n_elem;
Chris@49:   const uword d_row_offset = d.row_offset;
Chris@49:   const uword d_col_offset = d.col_offset;
Chris@49:     
Chris@49:   const Proxy<T1> P( o.get_ref() );
Chris@49:   
Chris@49:   arma_debug_check
Chris@49:     (
Chris@49:     ( (d.n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
Chris@49:     "diagview: given object has incompatible size"
Chris@49:     );
Chris@49:   
Chris@49:   const bool is_alias = P.is_alias(d_m);
Chris@49:   
Chris@49:   arma_extra_debug_warn(is_alias, "aliasing detected");
Chris@49:   
Chris@49:   if( (is_Mat<typename Proxy<T1>::stored_type>::value == true) || (Proxy<T1>::prefer_at_accessor == true) || (is_alias == true) )
Chris@49:     {
Chris@49:     const unwrap_check<typename Proxy<T1>::stored_type> tmp(P.Q, is_alias);
Chris@49:     const Mat<eT>& x = tmp.M;
Chris@49:     
Chris@49:     const eT* x_mem = x.memptr();
Chris@49:     
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = x_mem[ii];
Chris@49:       const eT tmp_j = x_mem[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) += tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) += tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) += x_mem[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   else
Chris@49:     {
Chris@49:     typename Proxy<T1>::ea_type Pea = P.get_ea();
Chris@49:       
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = Pea[ii];
Chris@49:       const eT tmp_j = Pea[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) += tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) += tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) += Pea[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: template<typename T1>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator-=(const Base<eT,T1>& o)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   diagview<eT>& d = *this;
Chris@49:   
Chris@49:   Mat<eT>& d_m = const_cast< Mat<eT>& >(d.m);
Chris@49:   
Chris@49:   const uword d_n_elem     = d.n_elem;
Chris@49:   const uword d_row_offset = d.row_offset;
Chris@49:   const uword d_col_offset = d.col_offset;
Chris@49:     
Chris@49:   const Proxy<T1> P( o.get_ref() );
Chris@49:   
Chris@49:   arma_debug_check
Chris@49:     (
Chris@49:     ( (d.n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
Chris@49:     "diagview: given object has incompatible size"
Chris@49:     );
Chris@49:   
Chris@49:   const bool is_alias = P.is_alias(d_m);
Chris@49:   
Chris@49:   arma_extra_debug_warn(is_alias, "aliasing detected");
Chris@49:   
Chris@49:   if( (is_Mat<typename Proxy<T1>::stored_type>::value == true) || (Proxy<T1>::prefer_at_accessor == true) || (is_alias == true) )
Chris@49:     {
Chris@49:     const unwrap_check<typename Proxy<T1>::stored_type> tmp(P.Q, is_alias);
Chris@49:     const Mat<eT>& x = tmp.M;
Chris@49:     
Chris@49:     const eT* x_mem = x.memptr();
Chris@49:     
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = x_mem[ii];
Chris@49:       const eT tmp_j = x_mem[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) -= tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) -= tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) -= x_mem[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   else
Chris@49:     {
Chris@49:     typename Proxy<T1>::ea_type Pea = P.get_ea();
Chris@49:       
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = Pea[ii];
Chris@49:       const eT tmp_j = Pea[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) -= tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) -= tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) -= Pea[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: template<typename T1>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator%=(const Base<eT,T1>& o)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   diagview<eT>& d = *this;
Chris@49:   
Chris@49:   Mat<eT>& d_m = const_cast< Mat<eT>& >(d.m);
Chris@49:   
Chris@49:   const uword d_n_elem     = d.n_elem;
Chris@49:   const uword d_row_offset = d.row_offset;
Chris@49:   const uword d_col_offset = d.col_offset;
Chris@49:     
Chris@49:   const Proxy<T1> P( o.get_ref() );
Chris@49:   
Chris@49:   arma_debug_check
Chris@49:     (
Chris@49:     ( (d.n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
Chris@49:     "diagview: given object has incompatible size"
Chris@49:     );
Chris@49:   
Chris@49:   const bool is_alias = P.is_alias(d_m);
Chris@49:   
Chris@49:   arma_extra_debug_warn(is_alias, "aliasing detected");
Chris@49:   
Chris@49:   if( (is_Mat<typename Proxy<T1>::stored_type>::value == true) || (Proxy<T1>::prefer_at_accessor == true) || (is_alias == true) )
Chris@49:     {
Chris@49:     const unwrap_check<typename Proxy<T1>::stored_type> tmp(P.Q, is_alias);
Chris@49:     const Mat<eT>& x = tmp.M;
Chris@49:     
Chris@49:     const eT* x_mem = x.memptr();
Chris@49:     
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = x_mem[ii];
Chris@49:       const eT tmp_j = x_mem[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) *= tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) *= tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) *= x_mem[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   else
Chris@49:     {
Chris@49:     typename Proxy<T1>::ea_type Pea = P.get_ea();
Chris@49:       
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = Pea[ii];
Chris@49:       const eT tmp_j = Pea[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) *= tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) *= tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) *= Pea[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: template<typename T1>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::operator/=(const Base<eT,T1>& o)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   diagview<eT>& d = *this;
Chris@49:   
Chris@49:   Mat<eT>& d_m = const_cast< Mat<eT>& >(d.m);
Chris@49:   
Chris@49:   const uword d_n_elem     = d.n_elem;
Chris@49:   const uword d_row_offset = d.row_offset;
Chris@49:   const uword d_col_offset = d.col_offset;
Chris@49:     
Chris@49:   const Proxy<T1> P( o.get_ref() );
Chris@49:   
Chris@49:   arma_debug_check
Chris@49:     (
Chris@49:     ( (d.n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
Chris@49:     "diagview: given object has incompatible size"
Chris@49:     );
Chris@49:   
Chris@49:   const bool is_alias = P.is_alias(d_m);
Chris@49:   
Chris@49:   arma_extra_debug_warn(is_alias, "aliasing detected");
Chris@49:   
Chris@49:   if( (is_Mat<typename Proxy<T1>::stored_type>::value == true) || (Proxy<T1>::prefer_at_accessor == true) || (is_alias == true) )
Chris@49:     {
Chris@49:     const unwrap_check<typename Proxy<T1>::stored_type> tmp(P.Q, is_alias);
Chris@49:     const Mat<eT>& x = tmp.M;
Chris@49:     
Chris@49:     const eT* x_mem = x.memptr();
Chris@49:     
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = x_mem[ii];
Chris@49:       const eT tmp_j = x_mem[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) /= tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) /= tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) /= x_mem[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   else
Chris@49:     {
Chris@49:     typename Proxy<T1>::ea_type Pea = P.get_ea();
Chris@49:       
Chris@49:     uword ii,jj;
Chris@49:     for(ii=0, jj=1; jj < d_n_elem; ii+=2, jj+=2)
Chris@49:       {
Chris@49:       const eT tmp_i = Pea[ii];
Chris@49:       const eT tmp_j = Pea[jj];
Chris@49:       
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) /= tmp_i;
Chris@49:       d_m.at( jj + d_row_offset,  jj + d_col_offset) /= tmp_j;
Chris@49:       }
Chris@49:     
Chris@49:     if(ii < d_n_elem)
Chris@49:       {
Chris@49:       d_m.at( ii + d_row_offset,  ii + d_col_offset) /= Pea[ii];
Chris@49:       }
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! extract a diagonal and store it as a column vector
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::extract(Mat<eT>& out, const diagview<eT>& in)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   // NOTE: we're assuming that the matrix has already been set to the correct size and there is no aliasing;
Chris@49:   // size setting and alias checking is done by either the Mat contructor or operator=()
Chris@49:   
Chris@49:   const Mat<eT>& in_m = in.m;
Chris@49:   
Chris@49:   const uword in_n_elem     = in.n_elem;
Chris@49:   const uword in_row_offset = in.row_offset;
Chris@49:   const uword in_col_offset = in.col_offset;
Chris@49:   
Chris@49:   eT* out_mem = out.memptr();
Chris@49:   
Chris@49:   uword i,j;
Chris@49:   for(i=0, j=1; j < in_n_elem; i+=2, j+=2)
Chris@49:     {
Chris@49:     const eT tmp_i = in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     const eT tmp_j = in_m.at( j + in_row_offset, j + in_col_offset );
Chris@49:     
Chris@49:     out_mem[i] = tmp_i;
Chris@49:     out_mem[j] = tmp_j;
Chris@49:     }
Chris@49:   
Chris@49:   if(i < in_n_elem)
Chris@49:     {
Chris@49:     out_mem[i] = in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! X += Y.diag()
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::plus_inplace(Mat<eT>& out, const diagview<eT>& in)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   arma_debug_assert_same_size(out.n_rows, out.n_cols, in.n_rows, in.n_cols, "addition");
Chris@49:   
Chris@49:   const Mat<eT>& in_m = in.m;
Chris@49:   
Chris@49:   const uword in_n_elem     = in.n_elem;
Chris@49:   const uword in_row_offset = in.row_offset;
Chris@49:   const uword in_col_offset = in.col_offset;
Chris@49:   
Chris@49:   eT* out_mem = out.memptr();
Chris@49:   
Chris@49:   uword i,j;
Chris@49:   for(i=0, j=1; j < in_n_elem; i+=2, j+=2)
Chris@49:     {
Chris@49:     const eT tmp_i = in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     const eT tmp_j = in_m.at( j + in_row_offset, j + in_col_offset );
Chris@49:     
Chris@49:     out_mem[i] += tmp_i;
Chris@49:     out_mem[j] += tmp_j;
Chris@49:     }
Chris@49:   
Chris@49:   if(i < in_n_elem)
Chris@49:     {
Chris@49:     out_mem[i] += in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! X -= Y.diag()
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::minus_inplace(Mat<eT>& out, const diagview<eT>& in)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   arma_debug_assert_same_size(out.n_rows, out.n_cols, in.n_rows, in.n_cols, "subtraction");
Chris@49:   
Chris@49:   const Mat<eT>& in_m = in.m;
Chris@49:   
Chris@49:   const uword in_n_elem     = in.n_elem;
Chris@49:   const uword in_row_offset = in.row_offset;
Chris@49:   const uword in_col_offset = in.col_offset;
Chris@49:   
Chris@49:   eT* out_mem = out.memptr();
Chris@49:   
Chris@49:   uword i,j;
Chris@49:   for(i=0, j=1; j < in_n_elem; i+=2, j+=2)
Chris@49:     {
Chris@49:     const eT tmp_i = in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     const eT tmp_j = in_m.at( j + in_row_offset, j + in_col_offset );
Chris@49:     
Chris@49:     out_mem[i] -= tmp_i;
Chris@49:     out_mem[j] -= tmp_j;
Chris@49:     }
Chris@49:   
Chris@49:   if(i < in_n_elem)
Chris@49:     {
Chris@49:     out_mem[i] -= in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! X %= Y.diag()
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::schur_inplace(Mat<eT>& out, const diagview<eT>& in)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   arma_debug_assert_same_size(out.n_rows, out.n_cols, in.n_rows, in.n_cols, "element-wise multiplication");
Chris@49:   
Chris@49:   const Mat<eT>& in_m = in.m;
Chris@49:   
Chris@49:   const uword in_n_elem     = in.n_elem;
Chris@49:   const uword in_row_offset = in.row_offset;
Chris@49:   const uword in_col_offset = in.col_offset;
Chris@49:   
Chris@49:   eT* out_mem = out.memptr();
Chris@49:   
Chris@49:   uword i,j;
Chris@49:   for(i=0, j=1; j < in_n_elem; i+=2, j+=2)
Chris@49:     {
Chris@49:     const eT tmp_i = in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     const eT tmp_j = in_m.at( j + in_row_offset, j + in_col_offset );
Chris@49:     
Chris@49:     out_mem[i] *= tmp_i;
Chris@49:     out_mem[j] *= tmp_j;
Chris@49:     }
Chris@49:   
Chris@49:   if(i < in_n_elem)
Chris@49:     {
Chris@49:     out_mem[i] *= in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! X /= Y.diag()
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::div_inplace(Mat<eT>& out, const diagview<eT>& in)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   arma_debug_assert_same_size(out.n_rows, out.n_cols, in.n_rows, in.n_cols, "element-wise division");
Chris@49:   
Chris@49:   const Mat<eT>& in_m = in.m;
Chris@49:   
Chris@49:   const uword in_n_elem     = in.n_elem;
Chris@49:   const uword in_row_offset = in.row_offset;
Chris@49:   const uword in_col_offset = in.col_offset;
Chris@49:   
Chris@49:   eT* out_mem = out.memptr();
Chris@49:   
Chris@49:   uword i,j;
Chris@49:   for(i=0, j=1; j < in_n_elem; i+=2, j+=2)
Chris@49:     {
Chris@49:     const eT tmp_i = in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     const eT tmp_j = in_m.at( j + in_row_offset, j + in_col_offset );
Chris@49:     
Chris@49:     out_mem[i] /= tmp_i;
Chris@49:     out_mem[j] /= tmp_j;
Chris@49:     }
Chris@49:   
Chris@49:   if(i < in_n_elem)
Chris@49:     {
Chris@49:     out_mem[i] /= in_m.at( i + in_row_offset, i + in_col_offset );
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT
Chris@49: diagview<eT>::at_alt(const uword ii) const
Chris@49:   {
Chris@49:   return m.at(ii+row_offset, ii+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT&
Chris@49: diagview<eT>::operator[](const uword ii)
Chris@49:   {
Chris@49:   return (const_cast< Mat<eT>& >(m)).at(ii+row_offset, ii+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT
Chris@49: diagview<eT>::operator[](const uword ii) const
Chris@49:   {
Chris@49:   return m.at(ii+row_offset, ii+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT&
Chris@49: diagview<eT>::at(const uword ii)
Chris@49:   {
Chris@49:   return (const_cast< Mat<eT>& >(m)).at(ii+row_offset, ii+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT
Chris@49: diagview<eT>::at(const uword ii) const
Chris@49:   {
Chris@49:   return m.at(ii+row_offset, ii+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT&
Chris@49: diagview<eT>::operator()(const uword ii)
Chris@49:   {
Chris@49:   arma_debug_check( (ii >= n_elem), "diagview::operator(): out of bounds" );
Chris@49:   
Chris@49:   return (const_cast< Mat<eT>& >(m)).at(ii+row_offset, ii+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT
Chris@49: diagview<eT>::operator()(const uword ii) const
Chris@49:   {
Chris@49:   arma_debug_check( (ii >= n_elem), "diagview::operator(): out of bounds" );
Chris@49:   
Chris@49:   return m.at(ii+row_offset, ii+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT&
Chris@49: diagview<eT>::at(const uword row, const uword)
Chris@49:   {
Chris@49:   return (const_cast< Mat<eT>& >(m)).at(row+row_offset, row+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT
Chris@49: diagview<eT>::at(const uword row, const uword) const
Chris@49:   {
Chris@49:   return m.at(row+row_offset, row+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT&
Chris@49: diagview<eT>::operator()(const uword row, const uword col)
Chris@49:   {
Chris@49:   arma_debug_check( ((row >= n_elem) || (col > 0)), "diagview::operator(): out of bounds" );
Chris@49:   
Chris@49:   return (const_cast< Mat<eT>& >(m)).at(row+row_offset, row+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: eT
Chris@49: diagview<eT>::operator()(const uword row, const uword col) const
Chris@49:   {
Chris@49:   arma_debug_check( ((row >= n_elem) || (col > 0)), "diagview::operator(): out of bounds" );
Chris@49:   
Chris@49:   return m.at(row+row_offset, row+col_offset);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: const Op<diagview<eT>,op_htrans>
Chris@49: diagview<eT>::t() const
Chris@49:   {
Chris@49:   return Op<diagview<eT>,op_htrans>(*this);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: const Op<diagview<eT>,op_htrans>
Chris@49: diagview<eT>::ht() const
Chris@49:   {
Chris@49:   return Op<diagview<eT>,op_htrans>(*this);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: arma_inline
Chris@49: const Op<diagview<eT>,op_strans>
Chris@49: diagview<eT>::st() const
Chris@49:   {
Chris@49:   return Op<diagview<eT>,op_strans>(*this);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::fill(const eT val)
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   Mat<eT>& x = const_cast< Mat<eT>& >(m);
Chris@49:   
Chris@49:   for(uword ii=0; ii < n_elem; ++ii)
Chris@49:     {
Chris@49:     x.at(ii+row_offset, ii+col_offset) = val;
Chris@49:     }
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::zeros()
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   (*this).fill(eT(0));
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: template<typename eT>
Chris@49: inline
Chris@49: void
Chris@49: diagview<eT>::ones()
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   (*this).fill(eT(1));
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! @}