## Copyright (C) 2001, 2002 Teemu Ikonen
##
## 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
## <http://www.gnu.org/licenses/>.

## Undocumented internal function.

## Created: 20.02.2001
## Author: Teemu Ikonen <tpikonen@pcu.helsinki.fi>
## Keywords: errorbar, plotting

function retval = __errcomm__ (caller, p, varargin)

  if (nargin < 4)
    print_usage ();
  endif

  nargs = length (varargin);

  k = 1;
  idx = 1;
  data = cell(6,1);
  while (k <= nargs)
    a = varargin{k++};
    if (isvector (a))
      a = a(:);
    elseif (ismatrix (a))
      ;
    else
      usage ("%s (...)", caller);
    endif
    sz = size (a);
    ndata = 1;
    data{ndata} = a;
    while (k <= nargs)
      a = varargin{k++};
      if (ischar (a) || iscellstr (a))
	retval(idx++) = __errplot__ (a, p, data{1:ndata});
	break;
      elseif (isvector (a))
	a = a(:);
      elseif (ismatrix (a))
	;
      else
	error ("wrong argument types");
      endif
      if (size (a) != sz)
	error ("argument sizes do not match");
      endif
      data{++ndata} = a;
      if (ndata > 6)
	error ("too many arguments to a plot");
      endif
    endwhile
  endwhile

  if (! (ischar (a) || iscellstr (a)))
    retval(idx++) = __errplot__ ("~", p, data{1:ndata});
  endif

  drawnow ();

endfunction
