Re: secondary x axis

[Jan Potac]

On Mon, 08 Apr 2013 14:15:29 +0200, Ben Abbott <address@hidden> wrote:

> On Apr 8, 2013, at 4:33 AM, Jan Potac wrote:
>
> > Trying to plot a figure with additional x axis on the top of the  
> > figure. (x-axis2
> = f(x-axis1))
> > I have found some example but getting plots bit offset. It seems the  
> > cause is
> the top x label which 'pushes' the second plot to move down due to  
> keeping some
> space from bounding box or window size. (if my observation correct)
> > I have been searching for some set () parameter but not succeeded yet.
> > Any hint, please?
> >
> > My code looks like:
> > f5 = figure(5, "visible", "on");
> > %x values in radians
> > hold 'on';
> > x = [0:0.1:6.3];
> > %y values values
> > y=sin(x);
> > %x values in degrees
> > x2=180/pi()*(x);
> > %means each new graph destroys the previous(overlay mode off)
> > plot(x, y);
> > hold 'off';
> > %attach the current axes (gca) to handle "axes1"
> > axes1=gca;
> > %ensure x axis at bottom
> > %see "get(axes1)" for additional properties
> > %see "set(axes1)" for properties which can be altered
> > set(axes1, 'XAxisLocation', 'bottom');
> > %overlay mode on
> > hold 'on';
> > %add additional axes
> > axes;
> > plot(x2, y);
> > axes2=gca;
> > %ensure x axis at top
> > set(axes2, 'XAxisLocation', 'top' );
> > %make different intervals
> > set(axes2, 'XTick', [x2(1):75:x2(length(x2))] );
> > %overlay off
> > hold 'off';
> >
> > Regards,
> > Jan
>
> Does the attached do what you want?
>
> I've changed the "activepostionproperty", set the "color" of the second  
> axis to
> "none", removed the yaxis tick labels for the second axes and eliminated  
> all
> plot objects from the second axes.
>
> Ben
Ben,
Thank you. It seems to be what I want though still need adjust some thinks  
like:
1. the sin function disappears after being plot. I think it could be due  
to overlaying but have not found the solution yet.
2. Similarly, bottom ticks disappear when second axis being set. And the  
same as on the top are shown instead.

(using Octave version 3.4.0)