## 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.

## -*- texinfo -*-
## @deftypefn {Mapping Function} {} rem (@var{x}, @var{y})
## Return the remainder of @code{@var{x} / @var{y}}, computed using the
## expression
## 
## @example
## x - y .* fix (x ./ y)
## @end example
## 
## An error message is printed if the dimensions of the arguments do not
## agree, or if either of the arguments is complex.
## @end deftypefn

## See also: round

## Author: jwe

function retval = rem (x, y)

  if (nargin != 2)
    usage ("rem (x, y)");
  endif

  if (any (size (x) != size (y)) && ! (is_scalar (x) || is_scalar (y)))
    error ("rem: argument sizes must agree");
  endif

  ## Matlab allows complex arguments, but as far as I can tell, that's a
  ## bunch of hooey.

  if (any (any (imag (x))) || any (any (imag (y))))
    error ("rem: complex arguments are not allowed");
  endif

  if (nargin == 2)
    retval = x - y .* fix (x ./ y);
  else
    error ("usage: rem (x, y)");
  endif

endfunction
