R help - Aug 2011 - lattice: index plot

Dear all,

How can I make an index plot with lattice, that is plotting a vector
simply against its particular index in the vector, i.e. something
similar to 

y <- rnorm(10)
plot(y)

I don't want to specify the x's manually, as this could become
cumbersome when having multiple panels.

I tried something like

library(lattice)
mp <- function(x, y, ...) {
  x <- 1:length(y)
  panel.xyplot(x, y, ...)
}

pp <- function(x, y, ...) {
  list(xlim = extendrange(1:length(y)), ylim = extendrange(y))
}

set.seed(123)
y <- rnorm(10)
xyplot(y ~ 1, panel = mp, prepanel = pp, xlab="Index")

but I was wondering whether there is a more straightforward way?

By the way, if I do not specify the ylim in the prepanel function the
plot is clipped, but reading Deepayan's book, p.140 :

"[...], so a user-specified prepanel function is not required to return
all of these components [i.e. xlim, ylim, xat, yat, dx and dy]; any
missing component will be replaced by the corresponding default."

I'd understand that if I do not specify ylim it is calculated
automatically? Not a big thing though, but it seems to me to be
inconsistent.

Any help appreciated. 

KR,

-Thorn

Does

  xyplot(y ~ seq_along(y), xlab = "Index")

do what you want?

Peter Ehlers

On 2011-08-02 09:07, Thaler, Thorn, LAUSANNE, Applied Mathematics
wrote:
> Dear all,
>
> How can I make an index plot with lattice, that is plotting a vector
> simply against its particular index in the vector, i.e. something
> similar to
>
> y<- rnorm(10)
> plot(y)
>
> I don't want to specify the x's manually, as this could become
> cumbersome when having multiple panels.
>
> I tried something like
>
> library(lattice)
> mp<- function(x, y, ...) {
>    x<- 1:length(y)
>    panel.xyplot(x, y, ...)
> }
>
> pp<- function(x, y, ...) {
>    list(xlim = extendrange(1:length(y)), ylim = extendrange(y))
> }
>
> set.seed(123)
> y<- rnorm(10)
> xyplot(y ~ 1, panel = mp, prepanel = pp, xlab="Index")
>
> but I was wondering whether there is a more straightforward way?
>
> By the way, if I do not specify the ylim in the prepanel function the
> plot is clipped, but reading Deepayan's book, p.140 :
>
> "[...], so a user-specified prepanel function is not required to
return
> all of these components [i.e. xlim, ylim, xat, yat, dx and dy]; any
> missing component will be replaced by the corresponding default."
>
> I'd understand that if I do not specify ylim it is calculated
> automatically? Not a big thing though, but it seems to me to be
> inconsistent.
>
> Any help appreciated.
>
> KR,
>
> -Thorn
>
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