[R] overlay xyplot on contourplot in lattice in R
Kathy-Andrée Laplante-Albert
Kathy-Andree.Laplante-Albert at UQTR.CA
Mon Jan 29 20:34:21 CET 2007
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-Andrée Laplante-Albert
Étudiante à la maîtrise
Groupe de Recherche sur les Écosystèmes Aquatiques
Université du Québec à Trois-Rivières
C.P. 500, Trois-Rivières (Québec) Canada
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