R help - Mar 2009 - how can I find actual axis limits for an existing plot?

I would like to query an existing plot to learn the actual x and y 
limits of the plottable area.  Is this possible?  I can discover the 
extreme tick mark locations but not the actual plot area limits.  
Setting the limits with ylim will not help in this case because I am 
overplotting an existing plot with a separate function, and I don't want 
my end-user to have to pass parameters around.

Thanks,
Mark

Hi,
see ?par
You  are probably interested in par("usr")


Mark Borowsky schrieb:
> I would like to query an existing plot to learn the actual x and y 
> limits of the plottable area.  Is this possible?  I can discover the 
> extreme tick mark locations but not the actual plot area limits.  
> Setting the limits with ylim will not help in this case because I am 
> overplotting an existing plot with a separate function, and I don't 
> want my end-user to have to pass parameters around.
>
> Thanks,
> Mark
>
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