bsxfun.h

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/*

Copyright (C) 2012-2018 Jordi Gutiérrez Hermoso

This file is part of Octave.

Octave is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Octave is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<https://www.gnu.org/licenses/>.

*/

// Author: Jordi Gutiérrez Hermoso <jordigh@octave.org>

#if ! defined (octave_bsxfun_h)
#define octave_bsxfun_h 1

#include "octave-config.h"

#include <algorithm>
#include <string>

#include "dim-vector.h"
#include "lo-error.h"

inline
bool
is_valid_bsxfun (const std::string& name,
                 const dim_vector& xdv, const dim_vector& ydv)
{
  for (int i = 0; i < std::min (xdv.ndims (), ydv.ndims ()); i++)
    {
      octave_idx_type xk = xdv(i);
      octave_idx_type yk = ydv(i);
      // Check the three conditions for valid bsxfun dims
      if (! ((xk == yk) || (xk == 1 && yk != 1) || (xk != 1 && yk == 1)))
        return false;
    }

  (*current_liboctave_warning_with_id_handler)
    ("Octave:language-extension", "performing `%s' automatic broadcasting",
     name.c_str ());

  return true;
}

// For inplace operations the size of the resulting matrix cannot be changed.
// Therefore we can only apply singleton expansion on the second matrix which
// alters the conditions to check.
inline
bool
is_valid_inplace_bsxfun (const std::string& name,
                         const dim_vector& rdv, const dim_vector& xdv)
{
  octave_idx_type r_nd = rdv.ndims ();
  octave_idx_type x_nd = xdv.ndims ();
  if (r_nd < x_nd)
    return false;

  for (int i = 0; i < r_nd; i++)
    {
      octave_idx_type rk = rdv(i);
      octave_idx_type xk = xdv(i);

      // Only two valid conditions to check; can't stretch rk
      if (! ((rk == xk) || (rk != 1 && xk == 1)))
        return false;
    }

  (*current_liboctave_warning_with_id_handler)
    ("Octave:language-extension", "performing `%s' automatic broadcasting",
     name.c_str ());

  return true;
}

#include "bsxfun-defs.cc"

#endif