## Copyright (C) 2000, 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 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
## 02110-1301, USA.

## -*- texinfo -*-
## @deftypefn {Function File} {} __errplot__ (@var{args})
## Really plot errorbar plots. User interface in function errorbar.
##
## @example
## __errplot__ (@var{arg1}, @var{arg2}, ..., @var{fmt})
## @end example
##
## @seealso{semilogx, semilogy, loglog, polar, mesh, contour, __pltopt__,
## bar, stairs, errorbar, replot, xlabel, ylabel, title}
## @end deftypefn

## Created: 18.7.2000
## Author: Teemu Ikonen <tpikonen@pcu.helsinki.fi>
## Keywords: errorbar, plotting

function __errplot__ (fstr, a1, a2, a3, a4, a5, a6)

  __plot_globals__;

  cf = __current_figure__;
  mxi = __multiplot_xi__(cf);
  myi = __multiplot_yi__(cf);

  __setup_plot__ ("__gnuplot_plot__");

  if (nargin < 3 || nargin > 7) # at least three data arguments needed
    print_usage ();
  endif

  j = __plot_data_offset__{cf}(mxi,myi);

  [fmt, key] = __pltopt__ ("__errplot__", fstr);

  [len, nplots] = size (a1);

  for i = 1:nplots
    ifmt = fmt{1+mod(i-1,numel(fmt))};
    switch (nargin - 1)
      case 2
	tmp = [(1:len)', a1(:,i), a2(:,i)];
      case 3
	tmp = [a1(:,i), a2(:,i), a3(:,i)];
      case 4
	if (index (ifmt, "boxxy") || index (ifmt, "xyerr"))
	  tmp = [a1(:,i), a2(:,i), a3(:,i), a4(:,i)];
	elseif (index (ifmt, "xerr"))
	  tmp = [a1(:,i), a2(:,i), a1(:,i)-a3(:,i), a1(:,i)+a4(:,i)];
	else
	  tmp = [a1(:,i), a2(:,i), a2(:,i)-a3(:,i), a2(:,i)+a4(:,i)];
	endif
      case 5
	error ("error plot requires 2, 3, 4 or 6 columns");
	## tmp = [a1(:,i), a2(:,i), a3(:,i), a4(:,i), a5(:,i)];
      case 6
	tmp = [a1(:,i), a2(:,i), ...
	       a1(:,i)-a3(:,i), a1(:,i)+a4(:,i), ...
	       a2(:,i)-a5(:,i), a2(:,i)+a6(:,i)];
    endswitch

    __plot_data__{cf}{mxi,myi}{j}{i} = tmp;
    __plot_data_type__{cf}{mxi,myi}(j) = 2;
    __plot_fmtstr__{cf}{mxi,myi}{j}{i} = ifmt;
    __plot_key_labels__{cf}{mxi,myi}{j} = key;
    __plot_usingstr__{cf}{mxi,myi}{j}{i} = "";
    __plot_withstr__{cf}{mxi,myi}{j}{i} = "";

  endfor

  __plot_data_offset__{cf}(mxi,myi) = ++j;

  __render_plot__ ();

endfunction