You want array not list, as in

levelplot(array(rnorm(400,rep(1:4,each=100)),c(10,10,4)))

abind::abind is useful sometimes for binding preexisting matrices to
arrays.

Cheers


On Sun, Aug 26, 2012 at 5:57 AM, Jens Peter Andersen / Region Nordjylland <
jepea@rn.dk> wrote:

> Dear R-users,
>
> My goal is to construct a levelplot (from the lattice package) with 4 or
> more individual plots sharing the same colorkey. While this appears to be
> relatively simple using functions, I haven't been able to find a solution
> using data matrices. An example of a working levelplot with just one matrix:
>
> d <- replicate(10,rnorm(10))
> levelplot(d)
>
> I have found partial solutions using print and split to show all 4
> levelplots on the same screen, but these would require me to either turn
> off the colorkey, or show it on every plot. Neither solution is completely
> satisfactory.
>
> If I use the layout-option in levelplot, like so:
>
> levelplot(d, layout=c(2,2))
>
> , I get the desired layout, with one large colorkey, main and xlab/ylab,
> but only one levelplot prints.
>
> I have been trying to construct a formula that yields the desired result,
> but I'm afraid my understanding of data frames, arrays and matrices is not
> deep enough to do so. If anyone knows of a working solution, I would be
> very grateful. What I imagine is something along the line of (not working
> code):
>
> d1 <- replicate(10,rnorm(10))
> d2 <- replicate(10,rnorm(10))
> d3 <- replicate(10,rnorm(10))
> d4 <- replicate(10,rnorm(10))
>
> d <- list(d1,d2,d3,d4)
> di <- c(1,2,3,4)
>
> levelplot(x ~ y | di, data = d, layout=c(2,2))
>
> NB! Avoiding the matrices is not an option. Some of them are obtained from
> raw text files.
>
> Thank you in advance,
> -JP
>
> Jens Peter Andersen
> PhD student, MLIS
> Medical Library, Aalborg Hospital
> Aarhus University Hospital
>
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>

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