Op_trans

//! More...

Classes
class	op_trans
	'matrix transpose' operation More...
class	op_trans2
Functions
template<typename eT >
static void	op_trans::apply_noalias (Mat< eT > &out, const Mat< eT > &A)
	Immediate transpose of a dense matrix.
template<typename eT >
static void	op_trans::apply (Mat< eT > &out, const Mat< eT > &A)
template<typename T1 >
static void	op_trans::apply (Mat< typename T1::elem_type > &out, const Op< T1, op_trans > &in)
template<typename T1 >
static void	op_trans2::apply (Mat< typename T1::elem_type > &out, const Op< T1, op_trans2 > &in)

---

Detailed Description

//!

---

Function Documentation

template<typename eT >

void op_trans::apply_noalias	(	Mat< eT > &	out,
		const Mat< eT > &	A
	)			[inline, static, inherited]

Immediate transpose of a dense matrix.

Definition at line 26 of file op_trans_meat.hpp.

References Mat< eT >::at(), syslib::copy_elem(), Mat< eT >::mem, Mat< eT >::memptr(), Mat< eT >::n_cols, Mat< eT >::n_elem, Mat< eT >::n_rows, and Mat< eT >::set_size().

Referenced by apply(), Mat< eT >::print_trans(), and Mat< eT >::raw_print_trans().

  {
  arma_extra_debug_sigprint();
  
  const u32 A_n_cols = A.n_cols;
  const u32 A_n_rows = A.n_rows;
  
  out.set_size(A_n_cols, A_n_rows);
  
  if( (A_n_cols == 1) || (A_n_rows == 1) )
    {
    syslib::copy_elem( out.memptr(), A.mem, A.n_elem );
    }
  else
    {
    for(u32 in_row = 0; in_row<A_n_rows; ++in_row)
      {
      const u32 out_col = in_row;
    
      for(u32 in_col = 0; in_col<A_n_cols; ++in_col)
        {
        const u32 out_row = in_col;
        out.at(out_row, out_col) = A.at(in_row, in_col);
        }
      }
    }
  
  }

template<typename eT >

void op_trans::apply	(	Mat< eT > &	out,
		const Mat< eT > &	A
	)			[inline, static, inherited]

Definition at line 60 of file op_trans_meat.hpp.

References apply_noalias(), Mat< eT >::at(), Mat< eT >::colptr(), Mat< eT >::n_cols, and Mat< eT >::n_rows.

Referenced by apply(), and auxlib::svd().

  {
  arma_extra_debug_sigprint();
  
  if(&out != &A)
    {
    op_trans::apply_noalias(out, A);
    }
  else
    {
    if(out.n_rows == out.n_cols)
      {
      arma_extra_debug_print("op_trans::apply(): doing in-place transpose of a square matrix");
      
      const u32 n_rows = out.n_rows;
      const u32 n_cols = out.n_cols;
      
      for(u32 col=0; col<n_cols; ++col)
        {
        eT* coldata = out.colptr(col);
        
        for(u32 row=(col+1); row<n_rows; ++row)
          {
          std::swap( out.at(col,row), coldata[row] );
          }
        }
      }
    else
      {
      const Mat<eT> A_copy = A;
      op_trans::apply_noalias(out, A_copy);
      }
    }
  }

template<typename T1 >

void op_trans::apply	(	Mat< typename T1::elem_type > &	out,
		const Op< T1, op_trans > &	in
	)			[inline, static, inherited]

Definition at line 100 of file op_trans_meat.hpp.

References apply(), unwrap< T1 >::M, and Op< T1, op_type >::m.

  {
  arma_extra_debug_sigprint();
  
  typedef typename T1::elem_type eT;
  
  const unwrap<T1> tmp(in.m);
  const Mat<eT>& A = tmp.M;
  
  op_trans::apply(out, A);
  }

template<typename T1 >

void op_trans2::apply	(	Mat< typename T1::elem_type > &	out,
		const Op< T1, op_trans2 > &	in
	)			[inline, static, inherited]

Definition at line 161 of file op_trans_meat.hpp.

References Op< T1, op_type >::aux, unwrap< T1 >::M, Op< T1, op_type >::m, Mat< eT >::memptr(), and Mat< eT >::n_elem.

  {
  arma_extra_debug_sigprint();
  
  typedef typename T1::elem_type eT;
  
  const unwrap<T1> tmp(in.m);
  
  op_trans::apply(out, tmp.M);
  
        eT* out_mem = out.memptr();
  const u32 n_elem  = out.n_elem;
  const eT  k       = in.aux;
  
  for(u32 i=0; i<n_elem; ++i)
    {
    out_mem[i] *= k;
    }
  
  }