Dear Prof Ripley, 
Thank you very much for your advice. In fact, I have already tried
'par("din")'. It does not seems to pick up the changes made to the
window. For example, I issued the par command after the plot: 
 
> par("din")
[1] 7.5 7.0
[changed window size]
 
> par("din")
[1] 7.5 7.0
The result is exactly the same after changes made to the window. Thanks
again. 
 
Best wishes,
Edmond

>>> Prof Brian Ripley <ripley@stats.ox.ac.uk> 15/02/10 14:35 >>>
On Mon, 15 Feb 2010, Edmond.Ng@lshtm.ac.uk wrote:

> Dear R-listers,
>
> I am writing a function that will generate a simple plot for the 
> user . The size of the window (that contains the plot) may not be 
> what the user wants.
>
> Supposing the user adjusts the window to a size of her/his choice, I

> would like to be able to save the new window size and specify the 
> plot to be of this new window size when the user calls my function 
> again. My question is what is the kind of 'get' or save graphic 
> parameter command that I need to extract the size of the current 
> window? I have looked at 'par' and 'getOption' but they don't seem 
> to what I need.

>From the help for par:

      ̔din̓ _*R.O.*_; the device dimensions, ̔(width,height)̓, in
           inches.

seems to be exactly what you are asking for.

(I'd be cautious about saving this across sessions: users may well use

R on different computers with a common file system.)

> Many thanks for any advice in advance.
>
> Best wishes,
> Edmond
>
>
>
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Edmond Ng, MSc CStat
> Lecturer in Medical Statistics
> Health Services Research Unit, London School Hygiene & Tropical
Medicine, Keppel Street, London WC1E 7HT, UK
> Tel: +44 (0)20 7927 2366 (direct line: ext 2065)  Fax: +44 (0)20 7580
8183
> (Room 35, Ground Floor, Malet Street side)
> Website: http://www.lshtm.ac.uk/hrsu 
>
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk 
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/ 
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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