max@0: // Copyright (C) 2008-2011 NICTA (www.nicta.com.au)
max@0: // Copyright (C) 2008-2011 Conrad Sanderson
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: //! \addtogroup subview_field
max@0: //! @{
max@0: 
max@0: 
max@0: template<typename oT>
max@0: inline
max@0: subview_field<oT>::~subview_field()
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: subview_field<oT>::subview_field
max@0:   (
max@0:   const field<oT>& in_f,
max@0:   const uword        in_row1,
max@0:   const uword        in_col1,
max@0:   const uword        in_n_rows,
max@0:   const uword        in_n_cols
max@0:   )
max@0:   : f(in_f)
max@0:   , f_ptr(0)
max@0:   , aux_row1(in_row1)
max@0:   , aux_col1(in_col1)
max@0:   , n_rows(in_n_rows)
max@0:   , n_cols(in_n_cols)
max@0:   , n_elem(in_n_rows*in_n_cols)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: subview_field<oT>::subview_field
max@0:   (
max@0:         field<oT>& in_f,
max@0:   const uword        in_row1,
max@0:   const uword        in_col1,
max@0:   const uword        in_n_rows,
max@0:   const uword        in_n_cols
max@0:   )
max@0:   : f(in_f)
max@0:   , f_ptr(&in_f)
max@0:   , aux_row1(in_row1)
max@0:   , aux_col1(in_col1)
max@0:   , n_rows(in_n_rows)
max@0:   , n_cols(in_n_cols)
max@0:   , n_elem(in_n_rows*in_n_cols)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: inline
max@0: void
max@0: subview_field<oT>::operator= (const field<oT>& x)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   subview_field<oT>& t = *this;
max@0:   
max@0:   arma_debug_check( (t.n_rows != x.n_rows) || (t.n_cols != x.n_cols), "incompatible field dimensions");
max@0:   
max@0:   for(uword col=0; col<t.n_cols; ++col)
max@0:     {
max@0:     for(uword row=0; row<t.n_rows; ++row)
max@0:       {
max@0:       t.at(row,col) = x.at(row,col);
max@0:       }
max@0:     }
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! x.subfield(...) = y.subfield(...)
max@0: template<typename oT>
max@0: inline
max@0: void
max@0: subview_field<oT>::operator= (const subview_field<oT>& x_in)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   const bool overlap = check_overlap(x_in);
max@0:         
max@0:         field<oT>*         tmp_field   = overlap ? new field<oT>(x_in.f) : 0;
max@0:   const subview_field<oT>* tmp_subview = overlap ? new subview_field<oT>(*tmp_field, x_in.aux_row1, x_in.aux_col1, x_in.n_rows, x_in.n_cols) : 0;
max@0:   const subview_field<oT>& x           = overlap ? (*tmp_subview) : x_in;
max@0:   
max@0:   subview_field<oT>& t = *this;
max@0:   
max@0:   arma_debug_check( (t.n_rows != x.n_rows) || (t.n_cols != x.n_cols), "incompatible field dimensions");
max@0:   
max@0:   for(uword col=0; col<t.n_cols; ++col)
max@0:     {
max@0:     for(uword row=0; row<t.n_rows; ++row)
max@0:       {
max@0:       t.at(row,col) = x.at(row,col);
max@0:       }
max@0:     }
max@0:     
max@0:   if(overlap)
max@0:     {
max@0:     delete tmp_subview;
max@0:     delete tmp_field;
max@0:     }
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: oT&
max@0: subview_field<oT>::operator[](const uword i)
max@0:   {
max@0:   arma_check( (f_ptr == 0), "subview_field::operator[]: field is read-only");
max@0:   
max@0:   const uword in_col = i / n_rows;
max@0:   const uword in_row = i % n_rows;
max@0:     
max@0:   const uword index = (in_col + aux_col1)*f.n_rows + aux_row1 + in_row;
max@0:   
max@0:   return *((*f_ptr).mem[index]);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: const oT&
max@0: subview_field<oT>::operator[](const uword i) const
max@0:   {
max@0:   const uword in_col = i / n_rows;
max@0:   const uword in_row = i % n_rows;
max@0:   
max@0:   const uword index = (in_col + aux_col1)*f.n_rows + aux_row1 + in_row;
max@0:   
max@0:   return *(f.mem[index]);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: oT&
max@0: subview_field<oT>::operator()(const uword i)
max@0:   {
max@0:   arma_check( (f_ptr == 0), "subview_field::operator(): field is read-only");
max@0:   arma_debug_check( (i >= n_elem), "subview_field::operator(): index out of bounds");
max@0:     
max@0:   const uword in_col = i / n_rows;
max@0:   const uword in_row = i % n_rows;
max@0:   
max@0:   const uword index = (in_col + aux_col1)*f.n_rows + aux_row1 + in_row;
max@0:   
max@0:   return *((*f_ptr).mem[index]);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: const oT&
max@0: subview_field<oT>::operator()(const uword i) const
max@0:   {
max@0:   arma_debug_check( (i >= n_elem), "subview_field::operator(): index out of bounds");
max@0:   
max@0:   const uword in_col = i / n_rows;
max@0:   const uword in_row = i % n_rows;
max@0:   
max@0:   const uword index = (in_col + aux_col1)*f.n_rows + aux_row1 + in_row;
max@0:   
max@0:   return *(f.mem[index]);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: oT&
max@0: subview_field<oT>::operator()(const uword in_row, const uword in_col)
max@0:   {
max@0:   arma_check( (f_ptr == 0), "subview_field::operator(): field is read-only");
max@0:   arma_debug_check( ((in_row >= n_rows) || (in_col >= n_cols)), "subview_field::operator(): index out of bounds");
max@0:   
max@0:   const uword index = (in_col + aux_col1)*f.n_rows + aux_row1 + in_row;
max@0:   
max@0:   return *((*f_ptr).mem[index]);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: const oT&
max@0: subview_field<oT>::operator()(const uword in_row, const uword in_col) const
max@0:   {
max@0:   arma_debug_check( ((in_row >= n_rows) || (in_col >= n_cols)), "subview_field::operator(): index out of bounds");
max@0:   
max@0:   const uword index = (in_col + aux_col1)*f.n_rows + aux_row1 + in_row;
max@0:   
max@0:   return *(f.mem[index]);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: oT&
max@0: subview_field<oT>::at(const uword in_row, const uword in_col)
max@0:   {
max@0:   //arma_extra_debug_sigprint();
max@0:   
max@0:   arma_check( (f_ptr == 0), "subview_field::at(): field is read-only");
max@0:   
max@0:   const uword index = (in_col + aux_col1)*f.n_rows + aux_row1 + in_row;
max@0:   
max@0:   return *((*f_ptr).mem[index]);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: arma_inline
max@0: const oT&
max@0: subview_field<oT>::at(const uword in_row, const uword in_col) const
max@0:   {
max@0:   //arma_extra_debug_sigprint();
max@0:   
max@0:   const uword index = (in_col + aux_col1)*f.n_rows + aux_row1 + in_row;
max@0:   
max@0:   return *(f.mem[index]);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename oT>
max@0: inline
max@0: bool
max@0: subview_field<oT>::check_overlap(const subview_field<oT>& x) const
max@0:   {
max@0:   const subview_field<oT>& t = *this;
max@0:   
max@0:   if(&t.f != &x.f)
max@0:     {
max@0:     return false;
max@0:     }
max@0:   else
max@0:     {
max@0:     if( (t.n_elem == 0) || (x.n_elem == 0) )
max@0:       {
max@0:       return false;
max@0:       }
max@0:     else
max@0:       {
max@0:       const uword t_row_start  = t.aux_row1;
max@0:       const uword t_row_end_p1 = t_row_start + t.n_rows;
max@0:       
max@0:       const uword t_col_start  = t.aux_col1;
max@0:       const uword t_col_end_p1 = t_col_start + t.n_cols;
max@0:       
max@0:       
max@0:       const uword x_row_start  = x.aux_row1;
max@0:       const uword x_row_end_p1 = x_row_start + x.n_rows;
max@0:       
max@0:       const uword x_col_start  = x.aux_col1;
max@0:       const uword x_col_end_p1 = x_col_start + x.n_cols;
max@0:       
max@0:       
max@0:       const bool outside_rows = ( (x_row_start >= t_row_end_p1) || (t_row_start >= x_row_end_p1) );
max@0:       const bool outside_cols = ( (x_col_start >= t_col_end_p1) || (t_col_start >= x_col_end_p1) );
max@0:       
max@0:       return ( (outside_rows == false) && (outside_cols == false) );
max@0:       }
max@0:     }
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! X = Y.subfield(...)
max@0: template<typename oT>
max@0: inline
max@0: void
max@0: subview_field<oT>::extract(field<oT>& actual_out, const subview_field<oT>& in)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   //
max@0:   const bool alias = (&actual_out == &in.f);
max@0:   
max@0:   field<oT>* tmp = (alias) ? new field<oT> : 0;
max@0:   field<oT>& out = (alias) ? (*tmp)        : actual_out;
max@0:   
max@0:   //
max@0:   
max@0:   const uword n_rows = in.n_rows;
max@0:   const uword n_cols = in.n_cols;
max@0:   
max@0:   out.set_size(n_rows, n_cols);
max@0:   
max@0:   arma_extra_debug_print(arma_boost::format("out.n_rows = %d   out.n_cols = %d    in.m.n_rows = %d  in.m.n_cols = %d") % out.n_rows % out.n_cols % in.f.n_rows % in.f.n_cols );
max@0:   
max@0:   for(uword col = 0; col<n_cols; ++col)
max@0:     {
max@0:     for(uword row = 0; row<n_rows; ++row)
max@0:       {
max@0:       out.at(row,col) = in.at(row,col);
max@0:       }
max@0:     }
max@0:   
max@0:   
max@0:   if(alias)
max@0:     {
max@0:     actual_out = out;
max@0:     delete tmp;
max@0:     }
max@0:   
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! @}