### Copyright (C) 1996 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.

function plot_2_v_m (x, y, fmt)

  if (nargin < 2 || nargin > 3)
    msg = sprintf ("plot_2_v_m (x, y)\n");
    msg = sprintf ("%s              plot_2_v_m (x, y, fmt)", msg);
    usage (msg);
  elseif (nargin == 2)
    fmt = "";
  endif

  [x_nr, x_nc] = size (x);
  [y_nr, y_nc] = size (y);

  if (x_nr == 1)
    x = x';
    tmp = x_nr;
    x_nr = x_nc;
    x_nc = tmp;
  endif

  if (x_nr == y_nr)
    1;
  elseif (x_nr == y_nc)
    y = y';
    tmp = y_nr;
    y_nr = y_nc;
    y_nc = tmp;
  else
    error ("plot_2_v_m: matrix dimensions must match");
  endif

  if (y_nc > 0)
    tmp = [x, y];
    cmd = sprintf ("gplot tmp(:,%d:%d:%d) %s", 1, x_nc, x_nc+1, fmt);
    for i = 2:y_nc
      cmd = sprintf ("%s, tmp(:,%d:%d:%d) %s", cmd, 1, i, i+1, fmt);
    endfor
    eval (cmd);
  else
    error ("plot_2_v_m: arguments must be a matrices");
  endif

endfunction