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Re: extra tick marks at top x-axis: strategy?

From: Ben Abbott
Subject: Re: extra tick marks at top x-axis: strategy?
Date: Thu, 08 Sep 2011 12:39:11 -0400

On Sep 8, 2011, at 12:31 PM, indium wrote:

> On Thu, Sep 08, 2011 at 10:24:18AM -0400, Ben Abbott wrote:
>> On Sep 8, 2011, at 10:17 AM, indium wrote:
>>> Hi all,
>>> I have attempted to add extra tick marks to a plot by adding another
>>> x-axis that is positioned on 'top'. But then the original plot is
>>> 'blanked' by the following plot command. I saw this because the second
>>> set of axes is not 'perfectly' overlapping with the first set (it quite
>>> far off, actually).
>>> Is this the way to make these second sets of tick mark labels? I'd
>>> like to have for instance temperature on the x-axis on the bottom and
>>> inverse temperature tick marks on the top axis.
>>> If so, how do I realign those two axes? I have set the 'position' of the
>>> two the same, but I think that due to margins needed for the labels,
>>> title, etc, the axes do not overlap.
>>> many thanks for any suggestions!
>> To make the axis on top transparent set its color to "none", and its 
>> position to that of the bottom axis. The code below is untested, and ax_top 
>> and ax_bot refer to the handles for the top and bottom axes.
>>      set (ax_bot, "activepositionproperty", "position")
>>      set (ax_top, "position", get (ax_bot, "position"))
>>      set (ax_top, "color", "none")
>> Ben
> okay, thanks! 
> for 'the record' I have put some commands together that work for me:
> ax_bot=axes();                                                                
> ax_top=axes();
> set(ax_bot,'activepositionproperty','position')
> set(ax_top,'position',get(ax_bot,'position'))
> set(ax_top,'color','none')
> x=1:10; y=sin(x) ; 
> plot(ax_bot,x,y)      % this will be in the standard color (blue)
> plot(ax_top,x,y,'or') % this will be red dots, associated with top axis
> set(ax_top,'activepositionproperty','position')
> set(ax_top,'xaxislocation','top')
> xtt=(0:3)*pi;
> xttl={'0','\pi','2\pi','3\pi'} % is \pi converted to the symbol?
> set(ax_top,'xtick',xtt)
> set(ax_top,'xticklabel',xttl)
> grid
> remarks:
> 1. In my case, \pi does not convert to the greek symbol.
> 2. Both 'activepositionproperty' settings are needed for aligment

I tried ...

plot (1:10)
xttl={'0','\pi','2\pi','3\pi'} % is \pi converted to the symbol?

... and see the expected result (\pi is converted to the Greek symbol)

Is the axis "interperter" property set to "tex"?


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