Re: [R] Getting tick positions

From: Paul Murrell <p.murrell_at_auckland.ac.nz>
Date: Wed 22 Jun 2005 - 08:28:17 EST

Hi

Uwe Ligges wrote:
> Jim Lemon wrote:
>

>> Thanks for the answers - I should have been more specific as I had 
>> already tried axTicks and pretty.
>>
>> The function in question is gantt.chart() in the latest plotrix 
>> package (Thanks to Scott Waichler for the original code). I settled on 
>> axis.POSIXct as it seemed the most appropriate for this function, but 
>> couldn't find a way to get the positions of the ticks so that I could 
>> then draw grid lines along the months|days|hours. While the trick of 
>> copying the original function works, I wondered why the axis* 
>> functions don't return the tick positions as barplot returns the bar 
>> positions. Is there any reason not to return "z", or is it just 
>> historical?

>
>
> I think historical.
>
> Replacing
> return R_NilValue;
> by
> return at;
> in do_axis (plot.c) should do the trick (well, I'm a bit afraid
> concerning the UNPROTECT, you might need to do that later, after the
> recording stuff?).

Thanks for the suggestion Uwe (you were right about the UNPROTECT). This change is now in the development version of R.

Paul

-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul@stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/

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Received on Wed Jun 22 08:31:15 2005

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