Re: secondary x axis

[Benjamin Abbott]

On Apr 8, 2013, at 10:23 AM, Jan Potac <address@hidden> wrote:

> 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)