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

From: Andreas Krause <andreas_at_elmo.ch>
Date: Wed, 16 Apr 2008 14:00:03 +0200

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, ...)

    }
))


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