R help - Jan 2007 - overlay xyplot on contourplot in lattice in R

Hi everybody, 

I want to do a contourplot in lattice with my raw data overlaid on it(xyplot)
which seemed to be a very easy thing to do.

I've tried it in many ways, but I haven't succeeded at obtaining it. 

let's say x, y, and z as the variables that comes from the data frame
''ex'':

therefore my countourplot is as followed :

contourplot(z ~ x * y, cuts=550)

I would like then to overalay on it xx and yy (same variables as x and y but in
another data frame let's say ''example'')

xyplot(example$xx, example$yy)

How can I do it?

It seems I could do it with the panel.contourplot and panel.xyplot options, but
until now I haven't suceeded. I found this command that maybe could help me
:


 # contourplot
contourplot(elev ~ longitude * latitude, data = interpgrid,
   panel = function(x, y, subscripts, ...) {
      panel.contourplot(x, y, subscripts, ...)
      panel.xyplot(ortann$longitude, ortann$latitude)
   } )

however, doesn't seem to work out, and I do not know what should I write for
subscripts. I do not understand the explanation in R.

Is anyone could help me? 

Thanks a lot in advance!

I use R, version 2.4.0.

Kathy-Andr?e Laplante-Albert
?tudiante ? la ma?trise
Groupe de Recherche sur les ?cosyst?mes Aquatiques
Universit? du Qu?bec ? Trois-Rivi?res
C.P. 500, Trois-Rivi?res (Qu?bec) Canada 

-------------------------------------------------
Courriel exp?di? via https://courriel.uqtr.ca

On 1/29/07, Kathy-Andr?e Laplante-Albert
<Kathy-Andree.Laplante-Albert at uqtr.ca> wrote:
>
>
> Hi everybody,
>
> I want to do a contourplot in lattice with my raw data overlaid on
it(xyplot)
> which seemed to be a very easy thing to do.
>
> I've tried it in many ways, but I haven't succeeded at obtaining
it.
>
> let's say x, y, and z as the variables that comes from the data frame
''ex'':
>
> therefore my countourplot is as followed :
>
> contourplot(z ~ x * y, cuts=550)
>
> I would like then to overalay on it xx and yy (same variables as x and y
but in
> another data frame let's say ''example'')
>
> xyplot(example$xx, example$yy)
>
> How can I do it?
>
> It seems I could do it with the panel.contourplot and panel.xyplot options,
but
> until now I haven't suceeded. I found this command that maybe could
help me :
>
>
>  # contourplot
> contourplot(elev ~ longitude * latitude, data = interpgrid,
>    panel = function(x, y, subscripts, ...) {
>       panel.contourplot(x, y, subscripts, ...)
>       panel.xyplot(ortann$longitude, ortann$latitude)
>    } )
This looks like something that should work. Could you explain why it
"doesn't seem to work out"?

-Deepayan
> however, doesn't seem to work out, and I do not know what should I
write for
> subscripts. I do not understand the explanation in R.
>
> Is anyone could help me?
>
> Thanks a lot in advance!
>
> I use R, version 2.4.0.
>
> Kathy-Andr?e Laplante-Albert
> ?tudiante ? la ma?trise
> Groupe de Recherche sur les ?cosyst?mes Aquatiques
> Universit? du Qu?bec ? Trois-Rivi?res
> C.P. 500, Trois-Rivi?res (Qu?bec) Canada
>
> -------------------------------------------------
> Courriel exp?di? via https://courriel.uqtr.ca
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>