R help - Aug 2012 - Multiple lattice levelplots from matrices

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

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
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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