# Re: [R] identical scales per panel with relation="free"

From: Deepayan Sarkar <deepayan.sarkar_at_gmail.com>
Date: Wed, 16 Apr 2008 07:55:27 -0700

On 4/16/08, Andreas Krause <andreas_at_elmo.ch> wrote:
>
> Using xyplot, I am plotting observed versus predicted values conditional to the values of a third variable.
> I would thus like to have an aspect ratio of 1 and the same axis range.
> Since the range of the values differs substantially between panels, the axis ranges shall be different for each panel (along the lines of relation="free"). However, x- and y-limits shall still be the same for a given panel.
> Any ideas on how to achieve that?
>
> # Example (that produces different x/y-limits per panel)
> set.seed(3484)
> x <- data.frame(
> "x"=c(rnorm(10), rnorm(10, 10))
> )
> x\$y <- x\$x + rnorm(length(x\$x))
> x\$z <- c(rep(c("A", "B"), c(10, 10)))
>
> print(xyplot(y ~ x | z, data=x,
> aspect=1,
> scales=list(
> relation="free"
> ),
> panel=function(x, y, ...)
> {
> panel.abline(0, 1)
> panel.xyplot(x, y, ...)
> }
> ))

Try this:

print(xyplot(y ~ x | z, data=x,

aspect=1,
scales=list(

relation="free"
),
prepanel = function(x, y, ...) {

```       r <- range(x, y, ...)
list(xlim = r, ylim = r)
```

},
panel=function(x, y, ...)
{
```       panel.abline(0, 1)
panel.xyplot(x, y, ...)
```

}
))

-Deepayan

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