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## Copyright (C) 2006 Shai Ayal
##
## This program 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.
##
## OctPlot 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 OctPlot; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## -*- texinfo -*-
## @deftypefn {Function File} {}
## [@var{ax},@var{hl},@var{hr}]= plotyy
## (@var{xl},@var{yl},@var{xr},@var{yr},[@var{fl},[@var{fr}]])
##
## Draws two plots on a single graph using seperate y-axes. The optional
## function handles @var{fl} and @var{fr} can be used to draw the left
## and right graphs corrspondingly. The must point to function which
## are of the form @var{h}=f(@var{x},@var{y}) such as
## @code{plot}, @code{semilogy}, @code{bar}, etc...
##
## plotyy returns the handles of the created axes in @var{ax} and the
## handles of the created objects in the left and right axes in @var{hl}
## and @var{hr} respectively.
##
## @end deftypefn
## @seealso{plot,bar,axes}
## Author: shaia
function [_ax,_hl,_hr] = plotyy (xl,yl,xr,yr,fl,fr)
error(nargchk(4,6,nargin));
cla();
if(nargin==4)
fl=@plot;
fr=@plot;
elseif(nargin==5)
fr=fl;
endif
## create the two plots and axes
ax(1)=gca();
hl = fl(xl,yl);
ax(2)=axes();
hr = fr(xr,yr);
## now make sure they look OK
set(ax(2),"Position",get(ax(1),"Position"));
set(ax(2),"Color","none");
set(ax(2),"YAxisLocation","right");
set(ax(2),"XTick",[]);
## get the x-axis to the the same in both axes:
__drawnow__();
xrl = get(ax(1),"Xlim");
xrr = get(ax(2),"Xlim");
xrange = [min(xrl(1),xrr(1)),max(xrl(2),xrr(2))];
set(ax(2),"XLim",xrange);
set(ax(1),"XLim",xrange);
set(gcf(),"CurrentAxes",ax(1));
if(nargout)
_ax = ax;
_hl = hl;
_hr = hr;
endif
endfunction
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