text: // Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
  // Copyright 2008-2016 National ICT Australia (NICTA)
  // 
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  // http://www.apache.org/licenses/LICENSE-2.0
  // 
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  // ------------------------------------------------------------------------
  
  
  //! \addtogroup op_index_max
  //! @{
  
  
  
  template<typename T1>
  inline
  void
  op_index_max::apply(Mat<uword>& out, const mtOp<uword,T1,op_index_max>& in)
    {
    arma_extra_debug_sigprint();
    
    typedef typename T1::elem_type eT;
    
    const uword dim = in.aux_uword_a;
    arma_debug_check( (dim > 1), "index_max(): parameter 'dim' must be 0 or 1" );
    
    const quasi_unwrap<T1> U(in.m);
    const Mat<eT>& X = U.M;
    
    if(U.is_alias(out) == false)
      {
      op_index_max::apply_noalias(out, X, dim);
      }
    else
      {
      Mat<uword> tmp;
      
      op_index_max::apply_noalias(tmp, X, dim);
      
      out.steal_mem(tmp);
      }
    }
  
  
  
  template<typename eT>
  inline
  void
  op_index_max::apply_noalias(Mat<uword>& out, const Mat<eT>& X, const uword dim)
    {
    arma_extra_debug_sigprint();
    
    typedef typename get_pod_type<eT>::result T;
    
    const uword X_n_rows = X.n_rows;
    const uword X_n_cols = X.n_cols;
    
    if(dim == 0)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 0");
      
      out.set_size((X_n_rows > 0) ? 1 : 0, X_n_cols);
      
      if(X_n_rows == 0)  { return; }
      
      uword* out_mem = out.memptr();
      
      for(uword col=0; col < X_n_cols; ++col)
        {
        op_max::direct_max( X.colptr(col), X_n_rows, out_mem[col] );
        }
      }
    else
    if(dim == 1)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 1");
      
      out.zeros(X_n_rows, (X_n_cols > 0) ? 1 : 0);
      
      if(X_n_cols == 0)  { return; }
      
      uword* out_mem = out.memptr();
      
      Col<T> tmp(X_n_rows);
      
      T* tmp_mem = tmp.memptr();
      
      if(is_cx<eT>::yes)
        {
        const eT* col_mem = X.colptr(0);
        
        for(uword row=0; row < X_n_rows; ++row)
          {
          tmp_mem[row] = eop_aux::arma_abs(col_mem[row]);
          }
        }
      else
        {
        arrayops::copy(tmp_mem, (T*)(X.colptr(0)), X_n_rows);
        }
      
      for(uword col=1; col < X_n_cols; ++col)
        {
        const eT* col_mem = X.colptr(col);
        
        for(uword row=0; row < X_n_rows; ++row)
          {
          T& max_val = tmp_mem[row];
          T  col_val = (is_cx<eT>::yes) ? T(eop_aux::arma_abs(col_mem[row])) : T(access::tmp_real(col_mem[row]));
          
          if(max_val < col_val)
            {
            max_val = col_val;
            
            out_mem[row] = col;
            }
          }
        }
      }
    }
  
  
  
  template<typename T1>
  inline
  void
  op_index_max::apply(Cube<uword>& out, const mtOpCube<uword, T1, op_index_max>& in)
    {
    arma_extra_debug_sigprint();
    
    const uword dim = in.aux_uword_a;
    arma_debug_check( (dim > 2), "index_max(): parameter 'dim' must be 0 or 1 or 2" );
    
    const unwrap_cube<T1> U(in.m);
    
    if(U.is_alias(out) == false)
      {
      op_index_max::apply_noalias(out, U.M, dim);
      }
    else
      {
      Cube<uword> tmp;
      
      op_index_max::apply_noalias(tmp, U.M, dim);
      
      out.steal_mem(tmp);
      }
    }
  
  
  
  template<typename eT>
  inline
  void
  op_index_max::apply_noalias(Cube<uword>& out, const Cube<eT>& X, const uword dim, const typename arma_not_cx<eT>::result* junk)
    {
    arma_extra_debug_sigprint();
    arma_ignore(junk);
    
    const uword X_n_rows   = X.n_rows;
    const uword X_n_cols   = X.n_cols;
    const uword X_n_slices = X.n_slices;
    
    if(dim == 0)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 0");
      
      out.set_size((X_n_rows > 0) ? 1 : 0, X_n_cols, X_n_slices);
      
      if(out.is_empty() || X.is_empty())  { return; }
      
      for(uword slice=0; slice < X_n_slices; ++slice)
        {
        uword* out_mem = out.slice_memptr(slice);
        
        for(uword col=0; col < X_n_cols; ++col)
          {
          op_max::direct_max( X.slice_colptr(slice,col), X_n_rows, out_mem[col] );
          }
        }
      }
    else
    if(dim == 1)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 1");
      
      out.zeros(X_n_rows, (X_n_cols > 0) ? 1 : 0, X_n_slices);
      
      if(out.is_empty() || X.is_empty())  { return; }
      
      Col<eT> tmp(X_n_rows);
      
      eT* tmp_mem = tmp.memptr();
      
      for(uword slice=0; slice < X_n_slices; ++slice)
        {
        uword* out_mem = out.slice_memptr(slice);
        
        arrayops::copy(tmp_mem, X.slice_colptr(slice,0), X_n_rows);
        
        for(uword col=1; col < X_n_cols; ++col)
          {
          const eT* col_mem = X.slice_colptr(slice,col);
          
          for(uword row=0; row < X_n_rows; ++row)
            {
            const eT val = col_mem[row];
            
            if(val > tmp_mem[row])
              {
              tmp_mem[row] = val;
              out_mem[row] = col;
              }
            }
          }
        }
      }
    else
    if(dim == 2)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 2");
      
      out.zeros(X_n_rows, X_n_cols, (X_n_slices > 0) ? 1 : 0);
      
      if(out.is_empty() || X.is_empty())  { return; }
      
      Mat<eT> tmp(X.slice_memptr(0), X_n_rows, X_n_cols);  // copy slice 0
      
      eT*    tmp_mem = tmp.memptr();
      uword* out_mem = out.memptr();
      
      const uword N = X.n_elem_slice;
      
      for(uword slice=1; slice < X_n_slices; ++slice)
        {
        const eT* X_slice_mem = X.slice_memptr(slice);
        
        for(uword i=0; i < N; ++i)
          {
          const eT val = X_slice_mem[i];
          
          if(val > tmp_mem[i])
            {
            tmp_mem[i] = val;
            out_mem[i] = slice;
            }
          }
        }
      }
    }
  
  
  
  template<typename eT>
  inline
  void
  op_index_max::apply_noalias(Cube<uword>& out, const Cube<eT>& X, const uword dim, const typename arma_cx_only<eT>::result* junk)
    {
    arma_extra_debug_sigprint();
    arma_ignore(junk);
    
    typedef typename get_pod_type<eT>::result T;
    
    const uword X_n_rows   = X.n_rows;
    const uword X_n_cols   = X.n_cols;
    const uword X_n_slices = X.n_slices;
    
    if(dim == 0)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 0");
      
      out.set_size((X_n_rows > 0) ? 1 : 0, X_n_cols, X_n_slices);
      
      if(out.is_empty() || X.is_empty())  { return; }
      
      for(uword slice=0; slice < X_n_slices; ++slice)
        {
        uword* out_mem = out.slice_memptr(slice);
        
        for(uword col=0; col < X_n_cols; ++col)
          {
          op_max::direct_max( X.slice_colptr(slice,col), X_n_rows, out_mem[col] );
          }
        }
      }
    else
    if(dim == 1)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 1");
      
      out.zeros(X_n_rows, (X_n_cols > 0) ? 1 : 0, X_n_slices);
      
      if(out.is_empty() || X.is_empty())  { return; }
      
      Col<T> tmp(X_n_rows);
      
      T* tmp_mem = tmp.memptr();
      
      for(uword slice=0; slice < X_n_slices; ++slice)
        {
        uword* out_mem = out.slice_memptr(slice);
        
        const eT* col0_mem = X.slice_colptr(slice,0);
        
        for(uword row=0; row < X_n_rows; ++row)
          {
          tmp_mem[row] = std::abs( col0_mem[row] );
          }
        
        for(uword col=1; col < X_n_cols; ++col)
          {
          const eT* col_mem = X.slice_colptr(slice,col);
          
          for(uword row=0; row < X_n_rows; ++row)
            {
            const T val = std::abs( col_mem[row] );
            
            if(val > tmp_mem[row])
              {
              tmp_mem[row] = val;
              out_mem[row] = col;
              }
            }
          }
        }
      }
    else
    if(dim == 2)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 2");
      
      out.zeros(X_n_rows, X_n_cols, (X_n_slices > 0) ? 1 : 0);
      
      if(out.is_empty() || X.is_empty())  { return; }
      
      uword* out_mem = out.memptr();
      
      Mat<T> tmp(X_n_rows, X_n_cols);
      
             T*      tmp_mem = tmp.memptr();
      const eT* X_slice0_mem = X.slice_memptr(0);
      
      const uword N = X.n_elem_slice;
      
      for(uword i=0; i<N; ++i)
        {
        tmp_mem[i] = std::abs( X_slice0_mem[i] );
        }
      
      for(uword slice=1; slice < X_n_slices; ++slice)
        {
        const eT* X_slice_mem = X.slice_memptr(slice);
        
        for(uword i=0; i < N; ++i)
          {
          const T val = std::abs( X_slice_mem[i] );
          
          if(val > tmp_mem[i])
            {
            tmp_mem[i] = val;
            out_mem[i] = slice;
            }
          }
        }
      }
    }
  
  
  
  template<typename T1>
  inline
  void
  op_index_max::apply(Mat<uword>& out, const SpBase<typename T1::elem_type,T1>& expr, const uword dim)
    {
    arma_extra_debug_sigprint();
    
    typedef typename T1::elem_type eT;
    
    arma_debug_check( (dim > 1), "index_max(): parameter 'dim' must be 0 or 1" );
    
    const unwrap_spmat<T1> U(expr.get_ref());
    const SpMat<eT>& X   = U.M;
    
    const uword X_n_rows = X.n_rows;
    const uword X_n_cols = X.n_cols;
    
    if(dim == 0)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 0");
      
      out.set_size((X_n_rows > 0) ? 1 : 0, X_n_cols);
      
      if(X_n_rows == 0)  { return; }
      
      uword* out_mem = out.memptr();
      
      for(uword col=0; col < X_n_cols; ++col)
        {
        out_mem[col] = X.col(col).index_max();
        }
      }
    else
    if(dim == 1)
      {
      arma_extra_debug_print("op_index_max::apply(): dim = 1");
      
      out.set_size(X_n_rows, (X_n_cols > 0) ? 1 : 0);
      
      if(X_n_cols == 0)  { return; }
      
      uword* out_mem = out.memptr();
      
      const SpMat<eT> Xt = X.st();
      
      for(uword row=0; row < X_n_rows; ++row)
        {
        out_mem[row] = Xt.col(row).index_max();
        }
      }
    }
  
  
  
  //! @}
  