## Copyright (C) 1996, 1997 John W. Eaton
##
## 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 2, 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, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.

## usage: reshape (a, m, n)
##
## Form an m x n matrix from the elements of a (taken in Fortran's
## column major ordering).
##
## See also: `:', do_fortran_indexing

## Author: jwe

function retval = reshape (a, m, n)

  if (nargin == 2 && prod (size (m)) == 2)
    n = m(2);
    m = m(1);
    nargin = 3;
  endif

  if (nargin == 3)
    [nr, nc] = size (a);
    if (nr * nc == m * n)
      dfi = do_fortran_indexing;
      istno = implicit_str_to_num_ok;
      unwind_protect
        do_fortran_indexing = 1;
	implicit_str_to_num_ok = 1;
        retval = zeros (m, n);
        retval (:) = a;
	if (isstr (a))
	  retval = setstr (retval);
	endif
      unwind_protect_cleanup
        do_fortran_indexing = dfi;
	implicit_str_to_num_ok = istno;
      end_unwind_protect
    else
      error ("reshape: sizes must match");
    endif
  else
    usage ("reshape (a, m, n) or reshape (a, size (b))");
  endif

endfunction