max@0: // Copyright (C) 2010 NICTA (www.nicta.com.au)
max@0: // Copyright (C) 2010 Conrad Sanderson
max@0: // Copyright (C) 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_find
max@0: //! @{
max@0: 
max@0: 
max@0: 
max@0: template<typename T1>
max@0: inline
max@0: uword
max@0: op_find::helper
max@0:   (
max@0:   Mat<uword>& indices,
max@0:   const Base<typename T1::elem_type, T1>& X
max@0:   )
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   typedef typename T1::elem_type      eT;
max@0:   typedef typename Proxy<T1>::ea_type ea_type;
max@0:   
max@0:   const Proxy<T1> A(X.get_ref());
max@0:   
max@0:   ea_type   PA     = A.get_ea();
max@0:   const uword n_elem = A.get_n_elem();
max@0:   
max@0:   indices.set_size(n_elem, 1);
max@0:   
max@0:   uword* indices_mem = indices.memptr();
max@0:   uword  n_nz        = 0;
max@0:   
max@0:   for(uword i=0; i<n_elem; ++i)
max@0:     {
max@0:     if(PA[i] != eT(0))
max@0:       {
max@0:       indices_mem[n_nz] = i;
max@0:       ++n_nz;
max@0:       }
max@0:     }
max@0:    
max@0:   return n_nz;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1, typename op_type>
max@0: inline
max@0: uword
max@0: op_find::helper
max@0:   (
max@0:   Mat<uword>& indices,
max@0:   const mtOp<uword, T1, op_type>& X,
max@0:   const typename arma_op_rel_only<op_type>::result           junk1,
max@0:   const typename arma_not_cx<typename T1::elem_type>::result junk2
max@0:   )
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   arma_ignore(junk1);
max@0:   arma_ignore(junk2);
max@0:   
max@0:   typedef typename T1::elem_type      eT;
max@0:   typedef typename Proxy<T1>::ea_type ea_type;
max@0:   
max@0:   const eT val = X.aux;
max@0:   
max@0:   const Proxy<T1> A(X.m);
max@0:   
max@0:   ea_type   PA     = A.get_ea();
max@0:   const uword n_elem = A.get_n_elem();
max@0:   
max@0:   indices.set_size(n_elem, 1);
max@0:   
max@0:   uword* indices_mem = indices.memptr();
max@0:   uword  n_nz        = 0;
max@0:   
max@0:   for(uword i=0; i<n_elem; ++i)
max@0:     {
max@0:     const eT tmp = PA[i];
max@0:     
max@0:     bool not_zero;
max@0:     
max@0:          if(is_same_type<op_type, op_rel_lt_pre   >::value == true)  { not_zero = (val <  tmp); }
max@0:     else if(is_same_type<op_type, op_rel_lt_post  >::value == true)  { not_zero = (tmp <  val); }
max@0:     else if(is_same_type<op_type, op_rel_gt_pre   >::value == true)  { not_zero = (val >  tmp); }
max@0:     else if(is_same_type<op_type, op_rel_gt_post  >::value == true)  { not_zero = (tmp >  val); }
max@0:     else if(is_same_type<op_type, op_rel_lteq_pre >::value == true)  { not_zero = (val <= tmp); }
max@0:     else if(is_same_type<op_type, op_rel_lteq_post>::value == true)  { not_zero = (tmp <= val); }
max@0:     else if(is_same_type<op_type, op_rel_gteq_pre >::value == true)  { not_zero = (val >= tmp); }
max@0:     else if(is_same_type<op_type, op_rel_gteq_post>::value == true)  { not_zero = (tmp >= val); }
max@0:     else if(is_same_type<op_type, op_rel_eq       >::value == true)  { not_zero = (tmp == val); }
max@0:     else if(is_same_type<op_type, op_rel_noteq    >::value == true)  { not_zero = (tmp != val); }
max@0:     else not_zero = false;
max@0:     
max@0:     if(not_zero == true)
max@0:       {
max@0:       indices_mem[n_nz] = i;
max@0:       ++n_nz;
max@0:       }
max@0:     }
max@0:   
max@0:   return n_nz;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1, typename op_type>
max@0: inline
max@0: uword
max@0: op_find::helper
max@0:   (
max@0:   Mat<uword>& indices,
max@0:   const mtOp<uword, T1, op_type>& X,
max@0:   const typename arma_op_rel_only<op_type>::result            junk1,
max@0:   const typename arma_cx_only<typename T1::elem_type>::result junk2
max@0:   )
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   arma_ignore(junk1);
max@0:   arma_ignore(junk2);
max@0:   
max@0:   typedef typename T1::elem_type      eT;
max@0:   typedef typename Proxy<T1>::ea_type ea_type;
max@0:   
max@0:   const eT val = X.aux;
max@0:   
max@0:   const Proxy<T1> A(X.m);
max@0:   
max@0:   ea_type   PA     = A.get_ea();
max@0:   const uword n_elem = A.get_n_elem();
max@0:   
max@0:   indices.set_size(n_elem, 1);
max@0:   
max@0:   uword* indices_mem = indices.memptr();
max@0:   uword  n_nz        = 0;
max@0:   
max@0:   for(uword i=0; i<n_elem; ++i)
max@0:     {
max@0:     const eT tmp = PA[i];
max@0:     
max@0:     bool not_zero;
max@0:     
max@0:          if(is_same_type<op_type, op_rel_eq   >::value == true)  { not_zero = (tmp == val); }
max@0:     else if(is_same_type<op_type, op_rel_noteq>::value == true)  { not_zero = (tmp != val); }
max@0:     else not_zero = false;
max@0:     
max@0:     if(not_zero == true)
max@0:       {
max@0:       indices_mem[n_nz] = i;
max@0:       ++n_nz;
max@0:       }
max@0:     }
max@0:   
max@0:   return n_nz;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1, typename T2, typename glue_type>
max@0: inline
max@0: uword
max@0: op_find::helper
max@0:   (
max@0:   Mat<uword>& indices,
max@0:   const mtGlue<uword, T1, T2, glue_type>& X,
max@0:   const typename arma_glue_rel_only<glue_type>::result       junk1,
max@0:   const typename arma_not_cx<typename T1::elem_type>::result junk2,
max@0:   const typename arma_not_cx<typename T2::elem_type>::result junk3
max@0:   )
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   arma_ignore(junk1);
max@0:   arma_ignore(junk2);
max@0:   arma_ignore(junk3);
max@0:   
max@0:   typedef typename T1::elem_type eT1;
max@0:   typedef typename T2::elem_type eT2;
max@0:   
max@0:   typedef typename Proxy<T1>::ea_type ea_type1;
max@0:   typedef typename Proxy<T2>::ea_type ea_type2;
max@0:   
max@0:   const Proxy<T1> A(X.A);
max@0:   const Proxy<T2> B(X.B);
max@0:   
max@0:   arma_debug_assert_same_size(A, B, "relational operator");
max@0:   
max@0:   ea_type1  PA     = A.get_ea();
max@0:   ea_type2  PB     = B.get_ea();
max@0:   const uword n_elem = B.get_n_elem();
max@0:   
max@0:   indices.set_size(n_elem, 1);
max@0:   
max@0:   uword* indices_mem = indices.memptr();
max@0:   uword  n_nz        = 0;
max@0:   
max@0:   for(uword i=0; i<n_elem; ++i)
max@0:     {
max@0:     const eT1 tmp1 = PA[i];
max@0:     const eT2 tmp2 = PB[i];
max@0:     
max@0:     bool not_zero;
max@0:     
max@0:          if(is_same_type<glue_type, glue_rel_lt    >::value == true)  { not_zero = (tmp1 <  tmp2); }
max@0:     else if(is_same_type<glue_type, glue_rel_gt    >::value == true)  { not_zero = (tmp1 >  tmp2); }
max@0:     else if(is_same_type<glue_type, glue_rel_lteq  >::value == true)  { not_zero = (tmp1 <= tmp2); }
max@0:     else if(is_same_type<glue_type, glue_rel_gteq  >::value == true)  { not_zero = (tmp1 >= tmp2); }
max@0:     else if(is_same_type<glue_type, glue_rel_eq    >::value == true)  { not_zero = (tmp1 == tmp2); }
max@0:     else if(is_same_type<glue_type, glue_rel_noteq >::value == true)  { not_zero = (tmp1 != tmp2); }
max@0:     else not_zero = false;
max@0:     
max@0:     if(not_zero == true)
max@0:       {
max@0:       indices_mem[n_nz] = i;
max@0:       ++n_nz;
max@0:       }
max@0:     }
max@0:   
max@0:   return n_nz;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1, typename T2, typename glue_type>
max@0: inline
max@0: uword
max@0: op_find::helper
max@0:   (
max@0:   Mat<uword>& indices,
max@0:   const mtGlue<uword, T1, T2, glue_type>& X,
max@0:   const typename arma_glue_rel_only<glue_type>::result        junk1,
max@0:   const typename arma_cx_only<typename T1::elem_type>::result junk2,
max@0:   const typename arma_cx_only<typename T2::elem_type>::result junk3
max@0:   )
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   arma_ignore(junk1);
max@0:   arma_ignore(junk2);
max@0:   arma_ignore(junk3);
max@0:   
max@0:   typedef typename Proxy<T1>::ea_type ea_type1;
max@0:   typedef typename Proxy<T2>::ea_type ea_type2;
max@0:   
max@0:   const Proxy<T1> A(X.A);
max@0:   const Proxy<T2> B(X.B);
max@0:   
max@0:   arma_debug_assert_same_size(A, B, "relational operator");
max@0:   
max@0:   ea_type1  PA     = A.get_ea();
max@0:   ea_type2  PB     = B.get_ea();
max@0:   const uword n_elem = B.get_n_elem();
max@0:   
max@0:   indices.set_size(n_elem, 1);
max@0:   
max@0:   uword* indices_mem = indices.memptr();
max@0:   uword  n_nz        = 0;
max@0:   
max@0:   for(uword i=0; i<n_elem; ++i)
max@0:     {
max@0:     bool not_zero;
max@0:     
max@0:          if(is_same_type<glue_type, glue_rel_eq    >::value == true)  { not_zero = (PA[i] == PB[i]); }
max@0:     else if(is_same_type<glue_type, glue_rel_noteq >::value == true)  { not_zero = (PA[i] != PB[i]); }
max@0:     else not_zero = false;
max@0:     
max@0:     if(not_zero == true)
max@0:       {
max@0:       indices_mem[n_nz] = i;
max@0:       ++n_nz;
max@0:       }
max@0:     }
max@0:   
max@0:   return n_nz;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1>
max@0: inline
max@0: void
max@0: op_find::apply(Mat<uword>& out, const mtOp<uword, T1, op_find>& X)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   const uword k    = X.aux_uword_a;
max@0:   const uword type = X.aux_uword_b;
max@0:   
max@0:   Mat<uword> indices;
max@0:   const uword n_nz = op_find::helper(indices, X.m);
max@0:   
max@0:   if(n_nz > 0)
max@0:     {
max@0:     if(type == 0)   // "first"
max@0:       {
max@0:       out = (k > 0 && k <= n_nz) ? indices.rows(0,      k-1   ) : indices.rows(0, n_nz-1);
max@0:       }
max@0:     else   // "last"
max@0:       {
max@0:       out = (k > 0 && k <= n_nz) ? indices.rows(n_nz-k, n_nz-1) : indices.rows(0, n_nz-1);
max@0:       }
max@0:     }
max@0:   else
max@0:     {
max@0:     out.reset();
max@0:     }
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! @}