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reshape.m
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1996-09-28
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# Copyright (C) 1993, 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.
function retval = reshape (a, m, n)
# 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
if (nargin != 3)
usage ("reshape (a, m, n)");
else
[nr, nc] = size (a);
if (nr * nc == m * n)
tmp = do_fortran_indexing;
unwind_protect
do_fortran_indexing = "true";
retval = zeros (m, n);
retval (:) = a;
unwind_protect_cleanup
do_fortran_indexing = tmp;
end_unwind_protect
else
error ("reshape: sizes must match");
endif
endif
endfunction