[R] Getting default aspect ratio from lattice

[Waichler, Scott R]

> > How can I get the value of the aspect ratio that is used in 
> a lattice 
> > plot?  In a levelplot for instance, the native units per cm of my x 
> > and y axes are different, and I need to know the aspect 
> ratio so that 
> > I can correctly plot vectors.  I know how to set the aspect in a 
> > high-level lattice function but I can't quite figure out how to get 
> > it.  I would like call to levelplot() without printing 
> anything, get 
> > the aspect ratio, use it to create my vector arrows, then call 
> > levelplot() again with print() to create the final figure.
> 
> Your question doesn't necessarily have a well defined answer, 
> because the aspect ratio may be computed only on printing 
> (and not even then, as the aspect ratio may change after 
> printing if you resize the device). In fact, this is the 
> default behaviour (aspect = "fill").

Thanks for the help, Deepayan.  Yes, I guess what I am looking for is
the actual numerical value for aspect.ratio that is used when aspect =
"fill".  My device is a pdf and I don't resize it.  Could I execute the
whole plot, including printing it, while saving the aspect.ratio that
was used, then create the plot again?

Scott Waichler