[R] Aspect ratio and limits

[Marc Schwartz]

On Tue, 2005-04-19 at 12:11 -0500, Deepayan Sarkar wrote:
> On Tuesday 19 April 2005 11:40, Barry Rowlingson wrote:
> > Marc Schwartz wrote:
> > > # Set height value as you require
> > > height <- 3
> > > X11(width = aspect * height, height = height)
> > > ....
> > > Does that get you what you need?
> >
> >   I'm guessing that will work, but it just seems unsatisfactory,
> > since if I resize my graphics window I mess it up.
> >
> >   If I set par(pty='s') I can have a square plot floating inside a
> > graphics window of any shape, I'd like to be able to plot something
> > specifying ylim and asp and get a rectangular plot with a fixed
> > aspect ratio floating around inside a resizable graphics device....
> >
> >   The 'aspect' ratio of xyplot (lattice package) lets you specify the
> > aspect ratio of the plot (not relating to the data, ie aspect=1 draws
> > a square plot whatever the ratio of X and Y range). Try this:
> >
> >   xy=data.frame(x=c(0,21),y=c(0,4))
> >   xyplot(y~x,data=xy,aspect=0.2)
> >
> >   - now resize the graphics window and the plot keeps its ratio.
> > That's the effect I was hoping to get from base graphics.
> >
> >   I could use lattice graphics but I'd have to work out the value of
> > 'aspect' to get the 1:1 aspect ratio for my data. I'm not sure this
> > is trivial, since it may involve considering the various margins and
> > spacing around a plot.
> 
> Try (with a sufficiently recent version of R)
> 
> xyplot(y~x, data=xy, aspect="iso")
> 
> Is that what you want?


That looks like it would do it and as with Baz' example, it is
resizable.

Thanks Deepayan.

Marc