Chris@49: // Copyright (C) 2009-2012 NICTA (www.nicta.com.au)
Chris@49: // Copyright (C) 2009-2012 Conrad Sanderson
Chris@49: // Copyright (C) 2012 Ryan Curtin
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 operator_div
Chris@49: //! @{
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! Base / scalar
Chris@49: template<typename T1>
Chris@49: arma_inline
Chris@49: typename
Chris@49: enable_if2< is_arma_type<T1>::value, const eOp<T1, eop_scalar_div_post> >::result
Chris@49: operator/
Chris@49:   (
Chris@49:   const T1&                    X,
Chris@49:   const typename T1::elem_type k
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   return eOp<T1, eop_scalar_div_post>(X, k);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! scalar / Base
Chris@49: template<typename T1>
Chris@49: arma_inline
Chris@49: typename
Chris@49: enable_if2< is_arma_type<T1>::value, const eOp<T1, eop_scalar_div_pre> >::result
Chris@49: operator/
Chris@49:   (
Chris@49:   const typename T1::elem_type k,
Chris@49:   const T1&                    X
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   return eOp<T1, eop_scalar_div_pre>(X, k);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! complex scalar / non-complex Base
Chris@49: template<typename T1>
Chris@49: arma_inline
Chris@49: typename
Chris@49: enable_if2
Chris@49:   <
Chris@49:   (is_arma_type<T1>::value && is_complex<typename T1::elem_type>::value == false),
Chris@49:   const mtOp<typename std::complex<typename T1::pod_type>, T1, op_cx_scalar_div_pre>
Chris@49:   >::result
Chris@49: operator/
Chris@49:   (
Chris@49:   const std::complex<typename T1::pod_type>& k,
Chris@49:   const T1&                                  X
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   return mtOp<typename std::complex<typename T1::pod_type>, T1, op_cx_scalar_div_pre>('j', X, k);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! non-complex Base / complex scalar
Chris@49: template<typename T1>
Chris@49: arma_inline
Chris@49: typename
Chris@49: enable_if2
Chris@49:   <
Chris@49:   (is_arma_type<T1>::value && is_complex<typename T1::elem_type>::value == false),
Chris@49:   const mtOp<typename std::complex<typename T1::pod_type>, T1, op_cx_scalar_div_post>
Chris@49:   >::result
Chris@49: operator/
Chris@49:   (
Chris@49:   const T1&                                  X,
Chris@49:   const std::complex<typename T1::pod_type>& k
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   return mtOp<typename std::complex<typename T1::pod_type>, T1, op_cx_scalar_div_post>('j', X, k);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! element-wise division of Base objects with same element type
Chris@49: template<typename T1, typename T2>
Chris@49: arma_inline
Chris@49: typename
Chris@49: enable_if2
Chris@49:   <
Chris@49:   (is_arma_type<T1>::value && is_arma_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
Chris@49:   const eGlue<T1, T2, eglue_div>
Chris@49:   >::result
Chris@49: operator/
Chris@49:   (
Chris@49:   const T1& X,
Chris@49:   const T2& Y
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   return eGlue<T1, T2, eglue_div>(X, Y);
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! element-wise division of Base objects with different element types
Chris@49: template<typename T1, typename T2>
Chris@49: inline
Chris@49: typename
Chris@49: enable_if2
Chris@49:   <
Chris@49:   (is_arma_type<T1>::value && is_arma_type<T2>::value && (is_same_type<typename T1::elem_type, typename T2::elem_type>::value == false)),
Chris@49:   const mtGlue<typename promote_type<typename T1::elem_type, typename T2::elem_type>::result, T1, T2, glue_mixed_div>
Chris@49:   >::result
Chris@49: operator/
Chris@49:   (
Chris@49:   const T1& X,
Chris@49:   const T2& Y
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   typedef typename T1::elem_type eT1;
Chris@49:   typedef typename T2::elem_type eT2;
Chris@49:   
Chris@49:   typedef typename promote_type<eT1,eT2>::result out_eT;
Chris@49:   
Chris@49:   promote_type<eT1,eT2>::check();
Chris@49:   
Chris@49:   return mtGlue<out_eT, T1, T2, glue_mixed_div>( X, Y );
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! element-wise division of sparse matrix by scalar
Chris@49: template<typename T1>
Chris@49: inline
Chris@49: typename
Chris@49: enable_if2<is_arma_sparse_type<T1>::value, SpMat<typename T1::elem_type> >::result
Chris@49: operator/
Chris@49:   (
Chris@49:   const T1&                    X,
Chris@49:   const typename T1::elem_type y
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   SpMat<typename T1::elem_type> result(X);
Chris@49:   
Chris@49:   result /= y;
Chris@49:   
Chris@49:   return result;
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! element-wise division of one sparse and one dense object
Chris@49: template<typename T1, typename T2>
Chris@49: inline
Chris@49: typename
Chris@49: enable_if2
Chris@49:   <
Chris@49:   (is_arma_sparse_type<T1>::value && is_arma_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
Chris@49:   SpMat<typename T1::elem_type>
Chris@49:   >::result
Chris@49: operator/
Chris@49:   (
Chris@49:   const T1& x,
Chris@49:   const T2& y
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   typedef typename T1::elem_type eT;
Chris@49:   
Chris@49:   const SpProxy<T1> pa(x);
Chris@49:   const   Proxy<T2> pb(y);
Chris@49:   
Chris@49:   const uword n_rows = pa.get_n_rows();
Chris@49:   const uword n_cols = pa.get_n_cols();
Chris@49:   
Chris@49:   arma_debug_assert_same_size(n_rows, n_cols, pb.get_n_rows(), pb.get_n_cols(), "element-wise division");
Chris@49:   
Chris@49:   SpMat<eT> result(n_rows, n_cols);
Chris@49:   
Chris@49:   uword new_n_nonzero = 0;
Chris@49:   
Chris@49:   for(uword col=0; col < n_cols; ++col)
Chris@49:   for(uword row=0; row < n_rows; ++row)
Chris@49:     {
Chris@49:     const eT val = pa.at(row,col) / pb.at(row, col);
Chris@49:     
Chris@49:     if(val != eT(0))
Chris@49:       {
Chris@49:       ++new_n_nonzero;
Chris@49:       }
Chris@49:     }
Chris@49:   
Chris@49:   result.mem_resize(new_n_nonzero);
Chris@49:   
Chris@49:   uword cur_pos = 0;
Chris@49:   
Chris@49:   for(uword col=0; col < n_cols; ++col)
Chris@49:   for(uword row=0; row < n_rows; ++row)
Chris@49:     {
Chris@49:     const eT val = pa.at(row,col) / pb.at(row, col);
Chris@49:     
Chris@49:     if(val != eT(0))
Chris@49:       {
Chris@49:       access::rw(result.values[cur_pos]) = val;
Chris@49:       access::rw(result.row_indices[cur_pos]) = row;
Chris@49:       ++access::rw(result.col_ptrs[col + 1]);
Chris@49:       ++cur_pos;
Chris@49:       }
Chris@49:     }
Chris@49:   
Chris@49:   // Fix column pointers
Chris@49:   for(uword col = 1; col <= result.n_cols; ++col)
Chris@49:     {
Chris@49:     access::rw(result.col_ptrs[col]) += result.col_ptrs[col - 1];
Chris@49:     }
Chris@49:   
Chris@49:   return result;
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! element-wise division of one dense and one sparse object
Chris@49: template<typename T1, typename T2>
Chris@49: inline
Chris@49: typename
Chris@49: enable_if2
Chris@49:   <
Chris@49:   (is_arma_type<T1>::value && is_arma_sparse_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
Chris@49:   Mat<typename T1::elem_type>
Chris@49:   >::result
Chris@49: operator/
Chris@49:   (
Chris@49:   const T1& x,
Chris@49:   const T2& y
Chris@49:   )
Chris@49:   {
Chris@49:   arma_extra_debug_sigprint();
Chris@49:   
Chris@49:   typedef typename T1::elem_type eT;
Chris@49:   
Chris@49:   const   Proxy<T1> pa(x);
Chris@49:   const SpProxy<T2> pb(y);
Chris@49:   
Chris@49:   const uword n_rows = pa.get_n_rows();
Chris@49:   const uword n_cols = pa.get_n_cols();
Chris@49:   
Chris@49:   arma_debug_assert_same_size(n_rows, n_cols, pb.get_n_rows(), pb.get_n_cols(), "element-wise division");
Chris@49:   
Chris@49:   Mat<eT> result(n_rows, n_cols);
Chris@49:   
Chris@49:   for(uword col=0; col < n_cols; ++col)
Chris@49:   for(uword row=0; row < n_rows; ++row)
Chris@49:     {
Chris@49:     result.at(row, col) = pa.at(row, col) / pb.at(row, col);
Chris@49:     }
Chris@49:   
Chris@49:   return result;
Chris@49:   }
Chris@49: 
Chris@49: 
Chris@49: 
Chris@49: //! @}